Development of MgO nanoparticles via green synthesis at varying concentrations of precursor and mahua flower extract Pranali Kurhade, Shyam Kodape, Kunjan Junghare, Praful G. Bansod, Dinesh Bhutada Inorganic and Nano Metal Chemistry, 2023 Green synthesis process has been developed to produce MgO nanoparticles using wet chemical method. In this process, Madhuca longifolia (M. longifolia) flower extracts has been used as a reducing and stabilizing agent and magnesium nitrate hexahydrate is used as a metal precursor. This study exhibits the effect of varied concentrations of metal precursors and flower extracts on the shape and size of the MgO nanoparticles. FTIR, UV vis spectroscopy, SEM, EDS and HRTEM analysis have been carried out to identify the functional groups involved in the reduction process, confirmation of MgO nanoparticles, morphological and elemental analysis of the MgO nanoparticles respectively. The results confirmed the presence of spherical MgO nanoparticles decorated over the surface of MgO microclusters. It is observed that the varying concentration of flower extracts and precursor have a profound effect on morphology of the nanoparticles resulting in the decrease in cluster size with the increase in extract concentration. The nanoparticles were also tested for the presence of antibacterial activity against the bacterial species of Escherichia coli and Staphylococcus aureus.
Optimization of fluoride removal using ultrasonically improved electrochemically generated adsorbent: A Taguchi approach Kunjan Junghare, Shyam M. Kodape, Ajit P. Rathod, Dilip H. Lataye Chemical and Process Engineering Inzynieria Chemiczna I Procesowa, 2022 Ultrasonically improved electrochemically generated adsorbent (UEGA) has been synthesized and used for adsorption of fluoride ions from fluoride laden waste water.UEGA was prepared in two major steps, firstly electrochemically generated adsorbent (EGA) was prepared using electrolytic method followed by ultrasonication treatment.Ultrasonication causes size reduction which leads to increase in surface area viz.active site which helps to enhance attachment of negatively charged fluoride ion on positively changed UEGA from waste water.UEGA was prepared at three different amplitude i.e. 50, 70 and 90% respectively.Taguchi optimization for defluoridation was carried out considering operating parameters such as initial concentration; contact time; adsorbent dose; and temperature.The results obtained demonstrated that adsorption showed different fluoride removal at varying frequency.This study proved that varying percentage amplitude of ultrasonication significantly affects defluoridation efficiency.
Adsorption study of F– ions onto ultrasonified electrochemicallgenerated ultrafine particles Kunjan Junghare, Shyam Kodape, Virendra Jadhao Desalination and Water Treatment, 2020 Ultrasonically improved electrochemically generated adsorbent (UEGA) has been synthesized and used for adsorption of fluoride ions from given aqueous solution. It is a two-step process, in the first step electrochemically generated adsorbent (EGA) has been prepared using electrolytic method and same was ultrasonicated to prepare UEGA. Ultrasonication causes an increase in adsorption by an increase in surface area which helps to enhance the defluoridation from the aqueous solution on the adsorbent. The kinetic models, adsorption isotherms and thermodynamic parameters such as enthalpy change ΔH°, entropy change ΔS° and change in Gibbs free energy ΔG° have been analyzed during the adsorption process. Adsorption kinetic follows the pseudo-second-order model with highest correlation coefficient value, that is, 0.93. Furthermore, Temkin isotherm suggests the energy of adsorption 1.049 kJ/mol at operating temperature of 298 K. Characterizations such as Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and specific surface analysis for Brunauer–Emmett–Teller has been performed to justify the mechanism and effect of ultrasonication on EGA. The overall study reveals that UEGA enhances defluoridation from aqueous solution.
Optimization of electrocoagulation process for fluoride removal: A blending approach using gypsum plaster rich wastewater Virendra K. Jadhao, Shyam Kodape, Kunjan Junghare Sustainable Environment Research, 2019 A novel blending approach has been introduced for fluoride removal by means of electrocoagulation. A blend was prepared by mixing synthetic phosphoric acid plant wastewater and gypsum plaster (GP) rich wastewater. This study explores defluoridation of wastewater using the simultaneous effect of chemical precipitation and electrocoagulation. Fourier transform infrared spectroscopy analysis of sludge confirms the presence Ca-F bond, which proves that enhancement in fluoride removal with blending of GP rich wastewater is due to simultaneous action of chemical precipitation and electrocoagulation. Optimization and statistical modeling were done with the help of MINITAB 17 software. Response surface methodology was performed using Box-Behnken Design to predict the fluoride removal efficiency and energy consumption. R2 values of 0.9485 and 0.9998 shows a good agreement between experimental and predicted values of responses. Kinetic study was done to determine the rate constant and it is found out that fluoride removal follows second order kinetic model. Blending approach confirmed the assistive role of GP rich wastewater in the enhancement of fluoride removal efficiency.
