Facile, rapid and eco-friendly synthesis of platinum nanoparticles (Pt NPs) using aqueous leaves extract of Quercus glauca (Qg) has been reported for first time to detection of environmental and human toxic hydrazine. The as-synthesized... more
Facile, rapid and eco-friendly synthesis of platinum nanoparticles (Pt NPs) using aqueous leaves extract of Quercus glauca (Qg) has been reported for first time to detection of environmental and human toxic hydrazine. The as-synthesized Pt NPs were characterized by spectroscopic and analytical techniques. The prepared Pt NPs were around spherical in shape and the size range from 5-15 nm. The electrocatalytic performance of hydrazine has been studied by CVs and amperometric techniques. Interestingly, the Pt NPs modified GCE shows a sharp peak at a very lower onset oxidation potential-0.3 V. The fabricated hydrazine sensor showed very lower detection limit, wide linear range, good sensitivity and excellent selectivity of 7 nm, 0.01 to 283 µM, and 1.704 µA/µM/cm 2 respectively. The green synthesized Pt NPs modified GCE sensor was successfully used for the detection of hydrazine (Spiked) in various water samples.
The kinetics, adsorption isotherms, thermodynamics and spectroscopic analysis of the removal of the crystal violet dye by adsorption onto Sida Rhombifolia were studied. The surface area of Sida Rhombifolia activated carbon (SRAC) was... more
The kinetics, adsorption isotherms, thermodynamics and spectroscopic analysis of the removal of the crystal violet dye by adsorption onto Sida Rhombifolia were studied. The surface area of Sida Rhombifolia activated carbon (SRAC) was found to be 18.14 m 2 /g. Batch adsorption experiments were conducted using dye solution and the effects of initial dye concentration and contact time, adsorbent dose and temperature were investigated. The Sida Rhombifolia adsorbent was charactrerized using FTIR, SEM with EDAX, BET and XRD. The equilibrium adsorption data fitted very well with the Langmuir , Temkin and D-R isotherm model. The kinetic process followed the pseudo second order kinetic model Positive ∆H o and negative ∆G o were indicative of the endothermic and spontaneous nature respectively of Crystal violet removal by adsorption onto Sida Rhombifolia.
Research Interests:
Research Interests:
Research Interests:
Flower-like MoS2 nanostructure was grown on graphene and carbon nanotubes (GR-MWCNTs) via insitu hydrothermal method and the resulting composite was employed for determination of hydrogen peroxide (H2O2). The MoS2/GR-MWCNTs composite was... more
Flower-like MoS2 nanostructure was grown on graphene and carbon nanotubes (GR-MWCNTs) via insitu hydrothermal method and the resulting composite was employed for determination of hydrogen peroxide (H2O2). The MoS2/GR-MWCNTs composite was characterized by scanning electron microscopy, Energy-dispersive X-ray spectroscopy and electrochemical methods. MoS2/GRMWCNTs possess three dimensional nanostructure, large electrochemically active surface area, porosity, and high conductivity and it was used for the enzymeless electrochemical determination of hydrogen peroxide. MoS2/GR-MWCNTs composite film modified electrode showed excellent electrocatalytic ability to the reduction of H2O2. The composite delivered significantly improved electrocatalytic ability to H2O2 in comparison with control electrodes. Furthermore, the electrode exhibited low overpotential, high faradaic current and fast response time. MoS2/GR-MWCNTs composite film modified electrode responds quickly to H2O2 over wide working concentration range of 5 µM–145 µM, sensitivity of 5.184 µAµM cm-2 and detection limit of 0.83 µM. Moreover, the sensor exhibited appreciable stability, repeatability and reproducibility. Real-time application was demonstrated in biological sample which showed good recoveries. The other advantages of the fabricated biosensor are simple and green fabrication approach, roughed and stable electrode surface, fast in sensing and highly reproducible, good biocompatibility, electrocatalytic ability and excellent
synergy between MoS2, MWCNTs and GR.
synergy between MoS2, MWCNTs and GR.