Ajaya Singh
Govt. V.Y.T.PG autonomous college, durg, Chemistry, Faculty Member
- Kinetics And Mechanistic Studies, Chemistry, NanoCrystalline Solid Thin Films, Micellar Kinetics,Oxidation, Catalysis, Conductometric Studies of Dye-Surfactant Interaction, and 14 moreAnalytical Chemistry, Polymer Chemistry, Environmental Chemistry, Paracetamol Degradation, Oxidation of Paracetamol, Triethanolamine Oxidation, Ruthenium Catalysed Oxidation, Reaction Kinetics of Acetaminophen, Oxidative Degradation of Paracetamol, Oxidation Communications, Kinetic Studies Oxidation Reaction, Kinetics of Oxidation of Paracetamol, Degradation of Paracetamol by, and Chloramine T In Alkline Mediumedit
CABs (Ca alginate beads), AVCABs (Aloe vera Ca alginate beads), and AVMNCABs (Aloe-vera functionalized magnetic nanoparticles entrapped Ca alginate beads) were developed as adsorbents for the removal of Cu(II) from aqueous solutions. The... more
CABs (Ca alginate beads), AVCABs (Aloe vera Ca alginate beads), and AVMNCABs (Aloe-vera functionalized magnetic nanoparticles entrapped Ca alginate beads) were developed as adsorbents for the removal of Cu(II) from aqueous solutions. The materials were characterized using Fourier-transform infrared (FTIR) spectroscopy, high-resolution scanning electron microscopic (HR-SEM) analysis, X-ray diffraction (XRD), energy-dispersive X-ray (EDX) spectroscopy, and a vibrating-sample magnetometer (VSM). The effect of several parameters, such as pH, time, temperature, adsorbent dose, etc., were investigated. The adsorption isotherm of Cu(II) was adjusted best to the Langmuir model. The maximum adsorption capacities were 111.11 mg/g, 41.66 mg/g, and 15.38 mg/g for AVMNCABs, AVCABs, and CABs, respectively. The study of the adsorption kinetics for Cu(II) ions on beads followed a pseudo-second-order kinetic model, with a very good correlation in all cases. The adsorption studies used a spectrophoto...
Research Interests:
The pollution of soil is a worldwide concern as it has harmful consequences on the environment and human health. With the continuous expansion of industry and agriculture, the content of hydrophobic organic pollutants in the soil has been... more
The pollution of soil is a worldwide concern as it has harmful consequences on the environment and human health. With the continuous expansion of industry and agriculture, the content of hydrophobic organic pollutants in the soil has been increasing, which has caused serious pollution to the soil. The removal of hydrophobic organic contaminants from soil, aiming to recover environmental safety, is an urgent matter to guarantee sufficient food and water for populations. Adsorption has proven to be an effective and economically practicable method for removing organic contaminants. This paper summarizes the use of low-cost adsorbents, such as biochar and activated carbon, for removing hydrophobic organic contaminants from soil. Biochar is usually appropriate for the adsorption of organic contaminants via the adsorption mechanisms of electrostatic interaction, precipitation, and ion exchange. Biochar also has numerous benefits, such as being obtained from several kinds of raw materials,...
Research Interests:
In spite of the growing demand for new antibiotics, in the recent years, the occurrence of fluoroquinolone antibiotics (as a curative agent for urinary tract disorders and respiratory problems) in wastewater have drawn immense attention.... more
In spite of the growing demand for new antibiotics, in the recent years, the occurrence of fluoroquinolone antibiotics (as a curative agent for urinary tract disorders and respiratory problems) in wastewater have drawn immense attention. Traces of antibiotic left-overs are present in the water system, causing noxious impact on human health and ecological environments, being a global concern. Our present work aims at tackling the major challenge of toxicity caused by antibiotics. This study deals with the efficient adsorption of two commonly used fluoroquinolone (FQ) antibiotics, i.e., Ofloxacin (OFX) and Moxifloxacin (MOX) on spherical hydrogel beads generated from methionine‒functionalized graphene oxide/ sodium alginate polymer (abbreviated Met-GO/SA) from aqueous solutions. The composition, morphology and crystal phase of prepared adsorbents were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy...
Research Interests:
CABs (Ca alginate beads), AVCABs (Aloe vera Ca alginate beads), and AVMNCABs (Aloe-vera functionalized magnetic nanoparticles entrapped Ca alginate beads) were developed as adsorbents for the removal of Cu(II) from aqueous solutions. The... more
CABs (Ca alginate beads), AVCABs (Aloe vera Ca alginate beads), and AVMNCABs (Aloe-vera functionalized magnetic nanoparticles entrapped Ca alginate beads) were developed as adsorbents for the removal of Cu(II) from aqueous solutions. The materials were characterized using Fourier-transform infrared (FTIR) spectroscopy, high-resolution scanning electron microscopic (HR-SEM) analysis, X-ray diffraction (XRD), energy-dispersive X-ray (EDX) spectroscopy, and a vibrating-sample magnetometer (VSM). The effect of several parameters, such as pH, time, temperature, adsorbent dose, etc., were investigated. The adsorption isotherm of Cu(II) was adjusted best to the Langmuir model. The maximum adsorption capacities were 111.11 mg/g, 41.66 mg/g, and 15.38 mg/g for AVMNCABs, AVCABs, and CABs, respectively. The study of the adsorption kinetics for Cu(II) ions on beads followed a pseudo-second-order kinetic model, with a very good correlation in all cases. The adsorption studies used a spectrophoto...
Research Interests:
Research Interests:
We prove that there exist three different transcendental entire functions that can have infinite number of domains which lie in the different periodic component of each of these functions and their compositions.
Norfloxacin (NOFX), a broadly used fluoroquinolone antibiotic, has been a subject of great concern in the past few years due to its undesirable effect on human beings and aquatic ecosystems. In this study, novel Mn doped ZnS (Mn:ZnS)... more
Norfloxacin (NOFX), a broadly used fluoroquinolone antibiotic, has been a subject of great concern in the past few years due to its undesirable effect on human beings and aquatic ecosystems. In this study, novel Mn doped ZnS (Mn:ZnS) quantum dots (QDs) were prepared through a facile chemical precipitation method and used as photocatalysts for NOFX degradation. Prior to photodegradation experiments, morphological and optical parameters of the QDs were examined through transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray analysis, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, fluorescence spectroscopy, Brunauer–Emmett–Teller analysis, and differential thermal and thermogravimetric analyses. Mn:ZnS QDs exhibited excellent properties of photodegradation, not only under UV irradiation but also in sunlight, which induced NOFX to photodegrade. The utmost photodegradation efficiency was obtained under optimal conditions (25 mL ...
Research Interests:
Research Interests:
Research Interests:
ABSTRACT A sensitive spectrophotometric method for determination of dicofol in subparts per million levels is described, which is based on Fujiwara reaction. Dicofol on alkaline hydrolysis gives chloroform, which reacts with pyridine to... more
ABSTRACT A sensitive spectrophotometric method for determination of dicofol in subparts per million levels is described, which is based on Fujiwara reaction. Dicofol on alkaline hydrolysis gives chloroform, which reacts with pyridine to produce red color. The color is discharged by addition of glacial acetic acid. The glutaconic aldehyde formed reacts with 4-aminoacetanilide to gave an orange-red dye which is extractable in 3-methyl-1-butanol. The extracted dye shows absorption maximum at 525 nm. Beer's law is obeyed in the range of 0.025–0.25 μg mL−1. Important analytical parameters such as time, temperature, reagent concentration, acidity etc. have been optimized for complete color reaction. Sandell's sensitivity and molar absorptivity for the system were found to be 0.000343 μg cm−2 and 1.077 × 106 L mol−1cm−1, respectively. The proposed method is satisfactorily applied to microlevel determination of dicofol in various environmental samples.
Research Interests:
ABSTRACT A simple and highly selective surfactant assisted kinetic spectrophotometric method for the determination of thallium has been developed. The method is based on the quantitative oxidation of Tl(I) to Tl(III) using bromine water... more
ABSTRACT A simple and highly selective surfactant assisted kinetic spectrophotometric method for the determination of thallium has been developed. The method is based on the quantitative oxidation of Tl(I) to Tl(III) using bromine water where the resulting Tl(III) liberated iodine from potassium iodide in acidic medium. The liberated iodine was subsequently reacted with I− ion to form tri-iodide ions (I3−). The tri-iodide ions formed were further reacted with cetylpyridinium cation (CP+) which produced a violet ion associate species having a λmax of 512 nm at which reaction was monitored. The reaction variables such as time, temperature, reagent concentration and acidity were optimized for the indicator reaction to achieve maximum sensitivity. The linear regression calibration concentration range of 0.007–0.1 μg mL− 1 Tl(I) was established as the Beer's law was obeyed in this range. Sandell's sensitivity and molar absorptivity of the ion associate species in terms of thallium were determined to be 0.000133 μg cm− 2 and 1.99 × 106 L mol− 1 cm− 1 respectively. The limit of detection was determined as 0.0029 μg mL− 1. The developed method has successfully been applied for the determination of thallium in different environmental samples with satisfactory results.
Research Interests:
ABSTRACT The synthesis and characterization of nanocrystalline Cd0.5Zn0.5S thin solid films is reported in the present paper. Chemical bath deposition, a direct low cost technique that involves metal ions (Cd2+ and Zn2+) source, a... more
ABSTRACT The synthesis and characterization of nanocrystalline Cd0.5Zn0.5S thin solid films is reported in the present paper. Chemical bath deposition, a direct low cost technique that involves metal ions (Cd2+ and Zn2+) source, a complexing agent and a chalcogen (sulphur) source was used to prepare thin films of Cd0.5Zn0.5S at a temperature of 70°C (343 K), with pH of 11 and deposition time of 2.5 hours. The characteristics of the prepared Cd0.5Zn0.5S thin films were investigated by their structural and optical properties and the effect of annealing on these properties were also studied.
The synthesis and characterization of nanocrystalline CdSe thin solid films are reported in this article. Chemical bath deposition, a direct low-cost technique that involves a cadmium salt solution, a complexing agent, and a chalcogen... more
The synthesis and characterization of nanocrystalline CdSe thin solid films are reported in this article. Chemical bath deposition, a direct low-cost technique that involves a cadmium salt solution, a complexing agent, and a chalcogen (selenium) source, was used to prepare thin films of CdSe at a temperature 70°C (343 K) in a water bath. Commercially available microscope glass slides (7.5
ABSTRACT The kinetics and mechanism of the oxidation of lactose by N-bromophthalimide in the absence and presence of cetyltrimethylammonium bromide and sodium dodecyl sulfate micelles was investigated in the presence of sulfuric acid... more
ABSTRACT The kinetics and mechanism of the oxidation of lactose by N-bromophthalimide in the absence and presence of cetyltrimethylammonium bromide and sodium dodecyl sulfate micelles was investigated in the presence of sulfuric acid medium. Under pseudo-first-order conditions reaction rate agreed with a first-, fractional- and negative fractional-order kinetics in N-bromophthalimide, lactose and sulfuric acid, respectively. In the presence of additives, the critical micellar concentration values were lower than those given in the literature. The catalytic role of cationic micelles was explained by the Berezin model. The anionic micelles showed slightly inhibitory effect. The influence of salts, phthalimide and mercuric acetate on the reaction rate was also studied. Using the kinetic data, the rate constant, binding constants, and corresponding activation parameters were evaluated. A possible reaction mechanism, which is based on the kinetic results and the product analysis, is proposed.
Research Interests:
ABSTRACT
Research Interests:
The present study, focused on low temperature synthesis of Mn doped ZnO nanorod array film via chemical bath deposition method on glass substrates. Microstructural, morphological, and optical properties of Mn doped ZnO nanorods were... more
The present study, focused on low temperature synthesis of Mn doped ZnO nanorod array film
via chemical bath deposition method on glass substrates. Microstructural, morphological, and
optical properties of Mn doped ZnO nanorods were investigated. X-ray diffraction patterns
showed sharp and intense peaks, indicating the highly crystalline nature of the film. Energy
dispersive x-ray (EDAX) results confirmed the presence of Mn ions in ZnO nanorods. Scanning
electron microscopy (SEM) pictures suggested Mn doped ZnO nanorods were well aligned and
distributed throughout the surface. Vibrational analysis has been carried out by Fourier transform
infrared and Raman spectroscopy. Room temperature photoluminescence (PL) exhibited the
presence of one broad defects related bands in visible region ranging 440-640 nm. Blue shifting
in absorption egde with Mn doping was observed in absoption spectra.
via chemical bath deposition method on glass substrates. Microstructural, morphological, and
optical properties of Mn doped ZnO nanorods were investigated. X-ray diffraction patterns
showed sharp and intense peaks, indicating the highly crystalline nature of the film. Energy
dispersive x-ray (EDAX) results confirmed the presence of Mn ions in ZnO nanorods. Scanning
electron microscopy (SEM) pictures suggested Mn doped ZnO nanorods were well aligned and
distributed throughout the surface. Vibrational analysis has been carried out by Fourier transform
infrared and Raman spectroscopy. Room temperature photoluminescence (PL) exhibited the
presence of one broad defects related bands in visible region ranging 440-640 nm. Blue shifting
in absorption egde with Mn doping was observed in absoption spectra.
Research Interests:
ABSTRACT The kinetics of oxidation of DL-Aspartic acid (Asp) by N-bromophthalimide (NBP) was studied in the presence of sodium dodecyl sulfate (SDS) in acidic medium at 308 K. The rate of reaction was found to have first-order dependence... more
ABSTRACT The kinetics of oxidation of DL-Aspartic acid (Asp) by N-bromophthalimide (NBP) was studied in the presence of sodium dodecyl sulfate (SDS) in acidic medium at 308 K. The rate of reaction was found to have first-order dependence on [NBP], fractional order dependence on [Asp] and inverse fractional order dependence on [H]. The addition of reduced product of the oxidant i.e., [Phthalimide] has decreased the rate of reaction. The rate of reaction increased with increase in inorganic salts concentration, whereas a change in [Cl], ionic strength of the medium and [Hg(OAc)2] had no effect on the oxidation velocity. The rate of reaction decreased with a decrease in dielectric constant of the medium. COOH-CH2-CN was identified as the main oxidation product of the reactions. The various activation parameters have been computed. A suitable reaction mechanism consistent with the experimental findings has been proposed. The micelle-binding constant has been calculated.
Research Interests:
The kinetics of oxidation of acetaldehyde by N-bromophthalimide (NBP) has been studied in the presence of cationic surfactant, cetyltrimethylammonium bromide (CTAB) at 308 K. The order of the reaction with respect to substrate... more
The kinetics of oxidation of acetaldehyde by N-bromophthalimide (NBP) has been studied in the presence of cationic surfactant, cetyltrimethylammonium bromide (CTAB) at 308 K. The order of the reaction with respect to substrate (acetaldehyde) and oxidant (NBP) is first and positive fractional with respect to the [H]. The rate of the reaction decreased with increase in dielectric constant of the medium. The rate constant first increased with increasing concentration of CTAB and after attaining peak, this rate constant decreased with increase in CTAB concentrations, on further increasing the concentration, it became almost constant. Addition of the inorganic salts, that is, [Cl] and [Br] rate of the reaction increased. CH3COOH was identified as the main oxidation product of the reaction. Activation parameters have been calculated. The rate constant and binding constant with the surfactant have also been evaluated.
Research Interests:
ABSTRACT The effect of cationic micelles of cetyl trimethyl ammonium bromide (CTAB) and anionic micelles of sodium dodecyl sulphate (SDS) on the kinetics of oxidation of 4-methyl-2-pentanone by N-bromophthalimide (NBP) was studied... more
ABSTRACT The effect of cationic micelles of cetyl trimethyl ammonium bromide (CTAB) and anionic micelles of sodium dodecyl sulphate (SDS) on the kinetics of oxidation of 4-methyl-2-pentanone by N-bromophthalimide (NBP) was studied iodometrically at 308 K. In addition to kinetic experiments, conductivity measurements have also been done to obtain critical micelle concentration and other thermodynamic properties. The kinetic observations indicate fractional order and first order dependence, with respect to [4-methyl-2-pentanone] and [NBP] respectively. Cationic surfactant (CTAB) strongly catalyzes the oxidation of 4-methyl-2-pentanone in aqueous acetic acid medium and typical kobs and [CTAB] profile was observed, that is, with the progressive increase in [CTAB], the reaction rate increased, at higher concentration constancy in kobs was observed, whereas anionic surfactant (SDS) was found to show no considerable effect on reaction rate. Mercuric acetate and phthalimide exhibited nil effect on the reaction rate. The presence of inorganic salts (KCl, KBr) exhibits a severe hike in the reaction rate. The various activation parameters in presence of CTAB and SDS have been also evaluated. A suitable mechanism consistent with the experimental findings has been proposed. The rate constants k(obs), cooperativity index (n), binding constants (Ks) with surfactants has been evaluated.
Research Interests:
ABSTRACT The effect of cationic micelles of cetyl trimethyl ammonium bromide (CTAB) and anionic micelles of sodium dodecyl sulphate (SDS) on the kinetics of oxidation of 4-methyl-2-pentanone by N-bromophthalimide (NBP) was studied... more
ABSTRACT The effect of cationic micelles of cetyl trimethyl ammonium bromide (CTAB) and anionic micelles of sodium dodecyl sulphate (SDS) on the kinetics of oxidation of 4-methyl-2-pentanone by N-bromophthalimide (NBP) was studied iodometrically at 308 K. In addition to kinetic experiments, conductivity measurements have also been done to obtain critical micelle concentration and other thermodynamic properties. The kinetic observations indicate fractional order and first order dependence, with respect to [4-methyl-2-pentanone] and [NBP] respectively. Cationic surfactant (CTAB) strongly catalyzes the oxidation of 4-methyl-2-pentanone in aqueous acetic acid medium and typical kobs and [CTAB] profile was observed, that is, with the progressive increase in [CTAB], the reaction rate increased, at higher concentration constancy in kobs was observed, whereas anionic surfactant (SDS) was found to show no considerable effect on reaction rate. Mercuric acetate and phthalimide exhibited nil effect on the reaction rate. The presence of inorganic salts (KCl, KBr) exhibits a severe hike in the reaction rate. The various activation parameters in presence of CTAB and SDS have been also evaluated. A suitable mechanism consistent with the experimental findings has been proposed. The rate constants k(obs), cooperativity index (n), binding constants (Ks) with surfactants has been evaluated.
Research Interests:
The kinetics of micellar catalyzed oxidation of oxalic acid [OA] by N-bromophthalimide was studied in the presence of perchloric acid at 308 K. The orders of reaction with respect to [Oxalic acid], [oxidant] and [H] were found to be... more
The kinetics of micellar catalyzed oxidation of oxalic acid [OA] by N-bromophthalimide was studied in the presence of perchloric acid at 308 K. The orders of reaction with respect to [Oxalic acid], [oxidant] and [H] were found to be fractional, first and negative fractional order respectively. Cationic micelles of cetyltrimethylammonium bromide increased the reaction rate. The effect of phthalimide, mercuric acetate and inorganic salts i.e., [Cl][Br] has also been done. The rate reaction decreases with increasing dielectric constant of the medium. The results are treated quantitatively in terms of Piszkiewicz and Berezin models. The rate constant (Kobs), cooperatively index (n) binding constant (ks+ko) and corresponding activation parameters (Ea, ΔH, ΔS and ΔG) were determined. A suitable mechanism consistent with the experimental finding has been proposed.
Research Interests:
The kinetics of micellar catalyzed oxidation of oxalic acid [OA] by N-bromophthalimide was studied in the presence of perchloric acid at 308 K. The orders of reaction with respect to [Oxalic acid], [oxidant] and [H] were found to be... more
The kinetics of micellar catalyzed oxidation of oxalic acid [OA] by N-bromophthalimide was studied in the presence of perchloric acid at 308 K. The orders of reaction with respect to [Oxalic acid], [oxidant] and [H] were found to be fractional, first and negative fractional order respectively. Cationic micelles of cetyltrimethylammonium bromide increased the reaction rate. The effect of phthalimide, mercuric acetate and inorganic salts i.e., [Cl][Br] has also been done. The rate reaction decreases with increasing dielectric constant of the medium. The results are treated quantitatively in terms of Piszkiewicz and Berezin models. The rate constant (Kobs), cooperatively index (n) binding constant (ks+ko) and corresponding activation parameters (Ea, ΔH, ΔS and ΔG) were determined. A suitable mechanism consistent with the experimental finding has been proposed.
Research Interests:
The kinetics of oxidation of acetaldehyde by N-bromophthalimide (NBP) has been studied in the presence of cationic surfactant, cetyltrimethylammonium bromide (CTAB) at 308 K. The order of the reaction with respect to substrate... more
The kinetics of oxidation of acetaldehyde by N-bromophthalimide (NBP) has been studied in the presence of cationic surfactant, cetyltrimethylammonium bromide (CTAB) at 308 K. The order of the reaction with respect to substrate (acetaldehyde) and oxidant (NBP) is first and positive fractional with respect to the [H]. The rate of the reaction decreased with increase in dielectric constant of the medium. The rate constant first increased with increasing concentration of CTAB and after attaining peak, this rate constant decreased with increase in CTAB concentrations, on further increasing the concentration, it became almost constant. Addition of the inorganic salts, that is, [Cl] and [Br] rate of the reaction increased. CH3COOH was identified as the main oxidation product of the reaction. Activation parameters have been calculated. The rate constant and binding constant with the surfactant have also been evaluated.
Research Interests:
Pd(II) catalyzed oxidation of paracetamol (PA) by sodium N-chloro p-toluenesulfonamide (chloramine-T or CAT) was studied in HClO4 and NaOH solutions at 303 K. The stoichiometry and the oxidation product in both solutions were found to be... more
Pd(II) catalyzed oxidation of paracetamol (PA) by sodium N-chloro p-toluenesulfonamide (chloramine-T or CAT)
was studied in HClO4 and NaOH solutions at 303 K. The stoichiometry and the oxidation product in both solutions were found to
be the same. The determined stoichiometric ratio was 1:2 ([PA]:[CAT]) and quinone oxime was identified as the oxidized product
of PA. However, the kinetics patterns in both media were different. In the acidic medium, the rate law was d[CAT]/dt =
k[CAT][PA]0.9[Pd(II)]0.8[Hþ]0.4 and the rate law was d[CAT]/dt = k[CAT][PA]0.9[Pd(II)] [PTS]0.4[NaOH]1 in the
alkaline medium. p-Toluenesulphonamide (PTS) is the reduced product of CAT. The kinetics of the reaction was studied as a
function of temperature, ionic strength, concentration of the salt, concentration of the added reaction product, and dielectric
constant of the medium to learn the mechanistic aspects of the reaction. A plausible mechanism is proposed, which is consistent with
the kinetics, stoichiometry, and product of the reaction.
was studied in HClO4 and NaOH solutions at 303 K. The stoichiometry and the oxidation product in both solutions were found to
be the same. The determined stoichiometric ratio was 1:2 ([PA]:[CAT]) and quinone oxime was identified as the oxidized product
of PA. However, the kinetics patterns in both media were different. In the acidic medium, the rate law was d[CAT]/dt =
k[CAT][PA]0.9[Pd(II)]0.8[Hþ]0.4 and the rate law was d[CAT]/dt = k[CAT][PA]0.9[Pd(II)] [PTS]0.4[NaOH]1 in the
alkaline medium. p-Toluenesulphonamide (PTS) is the reduced product of CAT. The kinetics of the reaction was studied as a
function of temperature, ionic strength, concentration of the salt, concentration of the added reaction product, and dielectric
constant of the medium to learn the mechanistic aspects of the reaction. A plausible mechanism is proposed, which is consistent with
the kinetics, stoichiometry, and product of the reaction.
Pd(II) catalyzed oxidation of paracetamol (PA) by sodium N-chloro p-toluenesulfonamide (chloramine-T or CAT) was studied in HClO4 and NaOH solutions at 303 K. The stoichiometry and the oxidation product in both solutions were found to be... more
Pd(II) catalyzed oxidation of paracetamol (PA) by sodium N-chloro p-toluenesulfonamide (chloramine-T or CAT)
was studied in HClO4 and NaOH solutions at 303 K. The stoichiometry and the oxidation product in both solutions were found to
be the same. The determined stoichiometric ratio was 1:2 ([PA]:[CAT]) and quinone oxime was identified as the oxidized product
of PA. However, the kinetics patterns in both media were different. In the acidic medium, the rate law was d[CAT]/dt =
k[CAT][PA]0.9[Pd(II)]0.8[Hþ]0.4 and the rate law was d[CAT]/dt = k[CAT][PA]0.9[Pd(II)] [PTS]0.4[NaOH]1 in the
alkaline medium. p-Toluenesulphonamide (PTS) is the reduced product of CAT. The kinetics of the reaction was studied as a
function of temperature, ionic strength, concentration of the salt, concentration of the added reaction product, and dielectric
constant of the medium to learn the mechanistic aspects of the reaction. A plausible mechanism is proposed, which is consistent with
the kinetics, stoichiometry, and product of the reaction.
was studied in HClO4 and NaOH solutions at 303 K. The stoichiometry and the oxidation product in both solutions were found to
be the same. The determined stoichiometric ratio was 1:2 ([PA]:[CAT]) and quinone oxime was identified as the oxidized product
of PA. However, the kinetics patterns in both media were different. In the acidic medium, the rate law was d[CAT]/dt =
k[CAT][PA]0.9[Pd(II)]0.8[Hþ]0.4 and the rate law was d[CAT]/dt = k[CAT][PA]0.9[Pd(II)] [PTS]0.4[NaOH]1 in the
alkaline medium. p-Toluenesulphonamide (PTS) is the reduced product of CAT. The kinetics of the reaction was studied as a
function of temperature, ionic strength, concentration of the salt, concentration of the added reaction product, and dielectric
constant of the medium to learn the mechanistic aspects of the reaction. A plausible mechanism is proposed, which is consistent with
the kinetics, stoichiometry, and product of the reaction.
Research Interests:
Research Interests:
Research Interests:
Page 1. PAPER: 04/2651 Ruthenate ion catalysed oxidation of D -galactose and D -xylose by alkaline solution of sodium metaperiodate: a kinetic study Ashok Kumar Singh*, N. Chaurasia, Shahla Rahmani, Jaya Srivastava ...
Research Interests:
Page 1. ABSTRACT: The kinetics of oxidation of glycine by N-bro-mophthalimide (NBP) were studied in the presence of an anionic surfactant, sodium dodecyl sulfate, in acidic medium at 308 K. The rate of reaction was found ...
Research Interests:
Page 1. Complex Variables, Vol. 49, No. 6, 15 May 2004, pp. 417425 SharingValuesand Normalityof Meromorphic Functions ANANDPRAKASH SINGH a, * and AJAYA SINGH b,y a Department of Mathematics,University of ...
Research Interests:
Page 1. PAPER: 05/3200 Ru(III) catalysed oxidation of diethanolamine and triethanolamine by Br(V) in presence of perchloric acid Ashok Kumar Singh*, Ajaya Kumar Singh a , Vineeta Singh, Shahla Rahmani, Ashish and Bharat ...
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Page 1. Kinetics and mechanism of oxidation of b-Alanine by N-bromophthalimide in the presence of Ru(III) chloride as homogenous catalyst in acidic medium Ajaya Kumar Singh Æ Bhawana Jain Æ Reena Negi Æ Yokraj Katre Æ Surya P. Singh Æ... more
Page 1. Kinetics and mechanism of oxidation of b-Alanine by N-bromophthalimide in the presence of Ru(III) chloride as homogenous catalyst in acidic medium Ajaya Kumar Singh Æ Bhawana Jain Æ Reena Negi Æ Yokraj Katre Æ Surya P. Singh Æ Virender K. Sharma ...
Research Interests:
Research Interests:
Acta Physico-Chimica Sinica 2009 25 (02): 319-326 ISSN: 1000-6818: CN: 11-1892/O6, Micelle Catalyzed Oxidation of Mannose by N-Bromophthalimide in the Presence of Sulfuric Acid. KATRE Yokraj; SINGH Minu; PATIL Sangeeta; SINGH Ajaya K. ...
ABSTRACT The Pd(II) homogeneous catalysis of periodates oxidation of crotonic acid (CA) in perchloric acid has been studied. The linear dependence of the reaction rate at lower [IO4−] and [Pd(II)] tends towards zero order at their higher... more
ABSTRACT The Pd(II) homogeneous catalysis of periodates oxidation of crotonic acid (CA) in perchloric acid has been studied. The linear dependence of the reaction rate at lower [IO4−] and [Pd(II)] tends towards zero order at their higher concentrations. The reaction exhibited zero order in [CA]. Negligible effect of change in [H+], ionic strength of medium and varying [Cl−] on rate of reaction is observed. [Pd]2+ and [IO4−] are assumed as the most reactive species of Pd(II) chloride and periodate, respectively. Acetaldehyde and glyoxylic acid have been identified as the main oxidation products of the reaction. Various activation parameters have also been calculated and recorded. On the basis of experimental findings, a suitable mechanism consistent with the observed kinetics was proposed. A comparative study was also made between the kinetic results of the present investigation and those of Pd(II) catalysed oxidation CA by chloramines-T in acidic medium.
Research Interests:
... DOI: 10.1080/07328300902999311 Surya Prakash Singh a , Ashok Kumar Singh a & Ajaya Kumar Singh b pages 278-292. ... Variation in [Cl − ] and ionic strength of the medium did not bring about any significant change in... more
... DOI: 10.1080/07328300902999311 Surya Prakash Singh a , Ashok Kumar Singh a & Ajaya Kumar Singh b pages 278-292. ... Variation in [Cl − ] and ionic strength of the medium did not bring about any significant change in the rate of reaction. ...
Research Interests:
Page 1. ORIGINAL ARTICLE A Kinetic and Mechanistic Study on the Oxidation of Hydroxy Acids by N-Bromophthalimide in the Presence of a Micellar System Sangeeta Patil Æ YR Katre Æ Ajaya Kumar Singh Received: 6 February ...
Research Interests:
RefDoc, THE reference in scientific document supply / Refdoc, la référence en fourniture de documents scientifiques Bienvenue - Welcome. Refdoc est un service / is powered by. ...
Research Interests:
The effect of cationic surfactant cetyltrimethylammonium bromide (CTAB) and anionic surfactant sodium lauryl sulphate (SDS) on the oxidation of malic acid (MA) by N-bromophthalimide (NBP) has been studied at 40°C. The reaction exhibits... more
The effect of cationic surfactant cetyltrimethylammonium bromide (CTAB) and anionic surfactant sodium lauryl sulphate (SDS) on the oxidation of malic acid (MA) by N-bromophthalimide (NBP) has been studied at 40°C. The reaction exhibits first order dependence on [NBP], fractional and inverse fractional order dependence on [malic acid] and [HClO4], respectively. The effect of sodium perchlorate (NaClO4), phthalimide and mercuric acetate
Research Interests:
Kinetics of the oxidation of citric acid (CA) by N-bromophthalimide (NBP) has been studied in the presence of cationic surfactant cetyltrimethylammonium bromide (CTAB) at 35°C. The CMC value is lower than those given in the literature for... more
Kinetics of the oxidation of citric acid (CA) by N-bromophthalimide (NBP) has been studied in the presence of cationic surfactant cetyltrimethylammonium bromide (CTAB) at 35°C. The CMC value is lower than those given in the literature for aqueous solutions of CTAB without ...
Research Interests:
Page 1. Z. Phys. Chem. 225 (2011) 107124 / DOI 10.1524/zpch.2011.0004 © by Oldenbourg Wissenschaftsverlag, München Effect of CTAB Micelle on the Oxidation of L-Leucine by N-Bromophthalimide: a Kinetic Study By ...