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... M. Rajasimman a , Corresponding Author Contact Information , E-mail The Corresponding Author and P. Karthic b. a Department of Chemical Engineering, Annamalai University, Annamalai Nagar-608002, Tamil Nadu, India. ...
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ABSTRACT The optimization and modeling of the electrocoagulation process which conducted by means of iron (EC-Fe) and aluminum (EC-Al) anodes, in the removal of C.I. Reactive Red 43 were performed through the response surface methodology... more
ABSTRACT The optimization and modeling of the electrocoagulation process which conducted by means of iron (EC-Fe) and aluminum (EC-Al) anodes, in the removal of C.I. Reactive Red 43 were performed through the response surface methodology (RSM). Moreover, the occurrence of possible destructive reactions during both EC-Fe and EC-Al processes was investigated using UV–Vis spectrometry, total organic carbon (TOC) and GC–MS analyses. The electrocoagulation experiments were carried out in a monopolar batch reactor using two anodes and two cathodes in parallel connections. Current density, time, pH and chloride concentration were considered as input variables for RSM. The analysis of variance revealed a high coefficient of determination (REC-Fe2=0.981 and REC-Al2=0.934) between experimental removal efficiency and predicted one by RSM developed models. The optimum conditions proposed by RSM to reach the maximum RR43 removal through the EC-Fe were different from the ones proposed for the EC-Al. At the optimum conditions, the removal efficiency of dye was more than 99% for both processes, whereas 90.58% and 98.37% of initial TOC concentration decreased during EC-Fe and EC-Al processes, respectively. The analyses results confirmed that beside sweep flocculation mechanism, known as the main removal mechanism, the degradation of dye was occurred during EC-Fe as a minor pathway.
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The aim of this study is to examine the effect of operational parameters on fluoride removal using electrocoagulation method. For this purpose, various operational parameters including initial pH, initial fluoride concentration, applied... more
The aim of this study is to examine the effect of operational parameters on fluoride removal using electrocoagulation method. For this purpose, various operational parameters including initial pH, initial fluoride concentration, applied current, reaction time, electrode connection mode, anode material, electrolyte salt, electrolyte concentration, number of electrodes and interelectrode distance were investigated. The highest defluoridation efficiency achieved at initial pH 6. In the case of initial fluoride concentration, maximum removal efficiency (98.5%) obtained at concentration of 25mg/l. The increase of applied current and reaction time improved defluoridation efficiency up to 99%. The difference of fluoride removal efficiencies between monopolar and bipolar series and monopolar parallel were significant, especially at reaction time of 5 min. When aluminum used as anode material, higher removal efficiency (98.5%) achieved compared to that of iron anode (67.7%). The best electro...
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Page 1. *Corresponding author: arami@aut.ac.ir available online @ www.jcst.icrc.ac.ir @ /2) 1387 (< 247 237 > @ @ > @ pH > 1< 2* < @ 3 @> < 4 1 < < < > < 4413 - 15784 2 < < < > < 4413... more
Page 1. *Corresponding author: arami@aut.ac.ir available online @ www.jcst.icrc.ac.ir @ /2) 1387 (< 247 237 > @ @ > @ pH > 1< 2* < @ 3 @> < 4 1 < < < > < 4413 - 15784 2 < < < > < 4413 - 15784 3 < > > < < 51167 - 87317 4 < < < < < 654 - 16765 ...
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This study aims to investigate the performance of polyaluminum chloride (PAC) as a coagulant to remove Acid blue 292 (AB292), which is used widely in textile industry in Iran. The effect of pH, coagulant dosage, kaolinite (as a natural... more
This study aims to investigate the performance of polyaluminum chloride (PAC) as a coagulant to remove Acid blue 292 (AB292), which is used widely in textile industry in Iran. The effect of pH, coagulant dosage, kaolinite (as a natural coagulant aid), and initial dye ...
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Chitosan was selected as a natural coagulating agent for the removal of acid dyes (Acid Blue 292; AB292, and Acid Red 398; AR398) from dye-containing solutions. The study was organised in two phases. In phase 1, chitosan was used alone as... more
Chitosan was selected as a natural coagulating agent for the removal of acid dyes (Acid Blue 292; AB292, and Acid Red 398; AR398) from dye-containing solutions. The study was organised in two phases. In phase 1, chitosan was used alone as a natural coagulant for the removal of the dyes. For this purpose, the effect of different parameters including pH, chitosan dosage and initial dye concentration on the dye removal efficiency was examined. In phase 2 of the study, the application of chitosan as a natural coagulant aid in conjunction with polyaluminium chloride (PAC) was assessed. According to the results of phase 1, the best removal efficiencies occurred in an acidic pH range (less than 6) for both of the dyes. Also, excellent dye removal results (about 90%) were achieved with relatively low dosages of chitosan (30–35 mg L−1 for AB292 and 50–60 mg L−1 for AR398). However, the initial concentration of the dyes severely influenced the coagulation performance of chitosan, which can co...
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This study aims to compare the performance of two waterworks sludge samples, ferric chloride sludge (FCS) and polyaluminium chloride sludge (PACS), as coagulants to remove Acid Red 119 (AR119) dye from aqueous solution. A series of batch... more
This study aims to compare the performance of two waterworks sludge samples, ferric chloride sludge (FCS) and polyaluminium chloride sludge (PACS), as coagulants to remove Acid Red 119 (AR119) dye from aqueous solution. A series of batch experiments were performed to investigate the effect of initial pH, coagulant dosage and initial dye concentration on coagulation/flocculation process efficiency. Results showed that the dye removal was strongly pH-dependent and followed the same trend for both coagulants, increasing steadily with decreasing initial pH in the range of 3–12. With the increase of coagulant dosage, the dye removal efficiency increased and no re-stabilization phenomenon was observed. However, the coagulant dosage needed for the maximum dye removal efficiency was much lower for FCS (150 mg dried sludge/L) in compare with PACS (5.5 g dried sludge/L). It seems that both charge neutralization and sweep flocculation mechanisms were involved in removal of AR119 using FCS and ...
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Textile industry consumes remarkable amounts of water during various operations. A significant portion of the water discharge to environment is in the form of colored contaminant. The present research reports the photocatalytic... more
Textile industry consumes remarkable amounts of water during various operations. A significant portion of the water discharge to environment is in the form of colored contaminant. The present research reports the photocatalytic degradation of anionic dye effluent using immobilized TiO2 nanoparticle on graphene oxide (GO) fabricated carbon electrodes. Acid Red 14 (AR 14) was used as model compound. Graphene oxide nanosheets were synthesized from graphite powder using modified Hummer&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;s method. The nanosheets were characterized with field emission scanning electron microscope (FESEM) images, X-ray diffraction (XRD) and FTIR spectrum. The GO nanoparticles were deposited on carbon electrode (GO-CE) by electrochemical deposition (ECD) method and used as catalyst bed. TiO2 nanoparticles were fixed on the bed (GO-CE- TiO2) with thermal process. Photocatalytic processes were carried out using a 500 ml solution containing dye in batch mode. Each photocatalytic treatment were carried out for 120 min. Effect of dye concentration (mg/L), pH of solution, time (min) and TiO2 content (g/L) on the photocatalytic decolorization was investigated.
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In this study, 4-amino-1,8-naphthalimide-conjugated polyamidoamine dendrimer was synthesized and characterized and its potentiality as a cation sensor was investigated. 4-Amino-1,8-naphthalic anhydride reacted with polyamidoamine... more
In this study, 4-amino-1,8-naphthalimide-conjugated polyamidoamine dendrimer was synthesized and characterized and its potentiality as a cation sensor was investigated. 4-Amino-1,8-naphthalic anhydride reacted with polyamidoamine dendrimer and the product was characterized using FTIR, (1)H NMR, (13)C NMR and melting point analysis method. The synthesized compound was applied to detect various cations in water media and N,N-dimethylformamide (DMF) via monitoring the quenching of the fluorescence intensity. Furthermore, various metal cations including Cu(2+), Ni(2+), Zn(2+), Pb(2+),Ca(2+), Ba(2+), Cd(2+), Hg(2+), Fe(2+), Fe(3+) and Ag(+) were tested. The complexes formed between the synthesized compound and metal cations in solution and their effects on Photoinduced Electron Transfer (PET) process were investigated regarding the potential application of the newly-synthesized dendrimer as a colorimetric and fluorescent sensor for such cations. The results clearly confirmed that the 1,8-naphthalimide groups surrounding the central dendrimer core showed strong green fluorescence emission at 553 nm. This effect considerably decreased with the introduction of all cations, except Ag(+) where the fluorescence quenching effect was remarkable and more dominant. Therefore, it can be concluded that the synthesized dye has the potentiality of being a highly sensitive and selective fluorescence sensor for Ag(+) cation.
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ABSTRACT In this study, the adsorption of Reactive blue 19 onto pomegranate residual-based activated carbon (PRAC) was investigated in aqueous solution. The activated carbon prepared by phosphoric acid activation under air condition. PRAC... more
ABSTRACT In this study, the adsorption of Reactive blue 19 onto pomegranate residual-based activated carbon (PRAC) was investigated in aqueous solution. The activated carbon prepared by phosphoric acid activation under air condition. PRAC was characterized for its surface chemistry by point of zero charge measurements, Scanning Electron Microscopy and nitrogen adsorption at 77 K. The effect of operational parameters including contact time, initial pH, adsorbent dose, initial dye concentration and particle size were studied. Results showed that an optimum dye removal efficiency (96.7%) was observed at initial pH=11, contact time of 5 min, adsorbent dose of 3.25 g/L, initial dye concentration of 200 mg/L, and particle size of 63-149µm. The adsorption process was found to follow the Temkin isotherm equation (R2=0.975) and second-order kinetic model (R2=0.999). Furthermore, thermodynamic parameters such as ΔG0, ΔH0, and ΔS0 were calculated.
Chitosan/feldspar biobased beads were synthesized, characterized, and tested for the removal of Acid Black 1 dye from aquatic phases. A four-factor central composite design (CCD) accompanied by response surface modeling (RSM) and... more
Chitosan/feldspar biobased beads were synthesized, characterized, and tested for the removal of Acid Black 1 dye from aquatic phases. A four-factor central composite design (CCD) accompanied by response surface modeling (RSM) and optimization was used to optimize the dye adsorption by the adsorbent (chitosan/feldspar composite) in 31 different batch experiments. Independent variables of temperature, pH, initial dye concentration, and adsorbent dose were used to change to coded values. To anticipate the responses, a quadratic model was applied. Analysis of variance (ANOVA) tested the significance of the process factors and their interactions. The adequacy of the model was investigated by the correlation between experimental and predicted data of the adsorption and the calculation of prediction errors. The results showed that the predicted maximum adsorption amount of 21.63 mg/g under the optimum conditions (pH 3, temperature 15°C, initial dye concentration 125 mg/L, and dose 0.2 g/50...
Nanofibrous filter media of polyamide-6/chitosan were fabricated by electrospinning onto a satin fabric substrate and characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and water contact... more
Nanofibrous filter media of polyamide-6/chitosan were fabricated by electrospinning onto a satin fabric substrate and characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and water contact angle (WCA). Anionic dye removal capability of the filter was investigated for Solophenyl Red 3BL and Polar Yellow GN, respectively, as acidic and direct dyes were investigated with respect to solution parameters (pH and initial dye concentration) and membrane parameters (electrospinning time and chitosan ratio) through filtration system. Experiments were designed using response surface methodology (RSM) based on five-level central composite design (CCD) with four parameters to maximize removal efficiency of the filter media. Moreover, the effect of parameters and their likely interactions on dye removal were investigated by mathematically developed models. The optimum values for solution pH, initial dye concentration, electrospinning time, and chito...
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Research Interests: Chemical Engineering, Biomedical Engineering, Chitosan, Surface modification, Escherichia coli, and 13 moreBiopolymers, Animals, Staphylococcus aureus, Reaction Time, Wool, Anti-Bacterial Agents, Particle Size, Scanning Electron Microscope, Surface Properties, Microbial Sensitivity Tests, Hydrogen-Ion Concentration, Weight Gain, and Phthalic anhydride
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Research Interests: Engineering, Chemical Engineering, Electrochemistry, Kinetics, Modeling, and 24 moreWastewater Treatment, Density, Desalination, Wastewater, Color, Ph, Textile industry, Current Density, First-Order Logic, CHEMICAL SCIENCES, Hydrogen Peroxide, Analytical Method, Electrolytes, First Order Logic, UV irradiation, Reactor, Oxidation, Textile Wastewater, Batch Reactor, Electrodes, Electrode, Sodium Chloride, Electrolyte, and Electrochemical Oxidation
ABSTRACT The modification of multi-walled carbon nanotube (MWCNT) with a cationic surfactant, cetyl trimethyl ammonium bromide (CTAB) and its application for removal of two direct dyes, direct red 80 (DR80) and direct red 23 (DR23) were... more
ABSTRACT The modification of multi-walled carbon nanotube (MWCNT) with a cationic surfactant, cetyl trimethyl ammonium bromide (CTAB) and its application for removal of two direct dyes, direct red 80 (DR80) and direct red 23 (DR23) were investigated. The raw and functionalized samples were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The influence of operational parameters was studied through batch adsorption experiments. For understanding the mechanisms of adsorption, Langmuir, Freundlich, Tempkin and Dubinin–Radushkevich isotherm models were used. Intraparticle diffusion, pseudo-first-order and second-order models were adopted to evaluate data and elucidate the kinetic of the adsorption process. The presence of functional groups: O–H, N–H, C–H and C–N were detected by FTIR spectroscopy. The results showed that CTAB were efficiently immobilized on the surface of the MWCNT. The Langmuir adsorption capacities of surfactant-functionalized carbon nanotubes (SF-CNT) for DR23 and DR80 were established as 188.68 and 120.48 mg/g, respectively. The sorption kinetic of SF-CNT followed pseudo-second-order kinetic model. The experiments indicated that the adsorption capacity of SF-CNT is more significant than raw-CNT; thus, it could be used as an effective adsorbent for removing of anionic dyes from waste waters.
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Research Interests: Materials Engineering, Condensed Matter Physics, Computational Fluid Dynamics, Chromatography, Kinetics, and 13 moreCarbon, Modeling, Nanoparticles, Ion Chromatography, Toxicity, Computation Fluid Dynamics, Degradation, First-Order Logic, Mineralization, Total Organic Carbon, Experimental Tests, Titanium oxide, and Daphnia Magna
Research Interests: Engineering, Kinetics, Modeling, Scanning Electron Microscopy, Adsorption, and 13 moreActivated Carbon, Desalination, Color, Sorption, CHEMICAL SCIENCES, Second Order, Waste Water, Pollutant, Textile Wastewater, Adsorption Isotherm Models, Lumping Kinetic Model, Langmuir Isotherm, and Fourier transform infrared
Research Interests: Environmental Engineering, Chemical Engineering, Civil Engineering, Computational Fluid Dynamics, Modeling, and 11 moreNanoparticle, Ion Chromatography, Fluid Dynamics, Photocatalysis, Water Desalination, Computation Fluid Dynamics, Mineralization, Finite Volume, Total Organic Carbon, Experimental Tests, and Textile Wastewater
Research Interests: Engineering, Water Purification, Response Surface Methodology, Water Treatment, Scanning Electron Microscopy, and 21 moreAdsorption, Optimization, Ph, Flocculation, Regression Analysis, Hazardous Materials, Iron, Wastewater treatment plant, Hazardous, Waste Treatment, Sewage, Surface Properties, Industrial Waste, Sewage Treatment Plant, Aqueous Solution, Neutralisation, Hydrogen-Ion Concentration, High Efficiency, Neutralization, Water Treatment Plant, and Floculation
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... Dyes and pigments 1997;33:149-165. 1521 Page 6. doi:10.3993/tbis2010272 www.tbisociety.org Removal of a Reactive Dye from Aqueous Solution Using Nano-Chitosan Emulsion H Momenzadeh 1 , A khosravi 1* , AR Tehrani-Bagha 2 , K Gharanjig... more
... Dyes and pigments 1997;33:149-165. 1521 Page 6. doi:10.3993/tbis2010272 www.tbisociety.org Removal of a Reactive Dye from Aqueous Solution Using Nano-Chitosan Emulsion H Momenzadeh 1 , A khosravi 1* , AR Tehrani-Bagha 2 , K Gharanjig 3 ...
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In this research, dyeing ability of the chitosan grafted-acylated wool fabrics has been studied. Acylated wool fabrics at two different solvents (dimethylsulfoxide (DMSO) and N,N-dimethyl formamide (DMF)) using succinic anhydride (SA) and... more
In this research, dyeing ability of the chitosan grafted-acylated wool fabrics has been studied. Acylated wool fabrics at two different solvents (dimethylsulfoxide (DMSO) and N,N-dimethyl formamide (DMF)) using succinic anhydride (SA) and grafted with chitosan have been dyed with acidic dye Polar Brilliant Red 3BN. Chitosan grafted fabrics indicated the higher K/S in comparison with the acylated and blank wool samples. J. Color Sci. Tech. 5(2011), 21-27© Institute for Color Science and Technology.