School Of Environment And Earth Sciences

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Author: search.filters.author.Mittal, SunilSubject: search.filters.subject.Adsorption

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    Novel Zinc ferrite composite with starch and carboxy methyl starch from biowaste precursor for the removal of Ni (II) ion from aqueous solutions
    (Taylor and Francis Ltd., 2023-06-19T00:00:00) Sharma, Dimple; Jasrotia, Rimzim; Singh, Jandeep; Mittal, Sunil; Singh, Harminder
    In the present work, Zinc ferrite composites with Mango starch (MS) and carboxymethyl mango starch (CMMS) were synthesized for the removal of Ni (II) ions from aqueous solutions. Composites prepared were characterized by Fourier Transform Infrared (FTIR) Spectroscopy, X-Ray Diffraction (XRD) analysis, pH of point zero charge (pHzpc), Scanning Electron Microscopy (SEM), and BET. Batch adsorption technique was used to study effect of various parameters such as pH, adsorbent dose, contact time, concentration, and temperature for removal of Ni (II) ions from aqueous solutions. The optimum time, pH, adsorbent dose and temperature required for ZFN@ MS and ZFN@ CMMS in this study was 110 min., 7 & 8, 0.1 g and 308 K, respectively. Out of various adsorption isotherms, Freundlich isotherm model fitted best with adsorption data. Maximum adsorption capacity for removal of Ni (II) were found to be 65.3 and 208.3 mg/g, respectively by using Zinc ferrite@ MS and Zinc ferrite@ CMMS adsorbents. Lagergren Pseudo second order model best fitted with results which indicated that the process of adsorption was chemical in nature. The value of adsorption energy for ZFN@ MS was 50 kJ/mol and for ZFN@ CMMS, it was 31.62 kJ/mol. Thermodynamic study revealed that process was endothermic and non-spontaneous in nature. Regeneration studies were conducted for five cycles where Zinc ferrite@ MS showed 71% regeneration efficiency and Zinc ferrite@ CMMS showed 78% regeneration efficiency for nickel ion removal from aqueous solution. � 2023 Taylor & Francis Group, LLC.
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    Robust removal of cationic dyes by zinc ferrite composites in single and ternary dye systems
    (Elsevier B.V., 2023-05-02T00:00:00) Rimzim; Singh, Jandeep; Mittal, Sunil; Singh, Harminder
    For the continuous economic growth and development of society, clean and safe water is the basic necessity. Therefore, it is necessary to treat contaminated water. Magnetic ferrite composites with bio-waste materials are less explored in the area of research, so these need to be focused. In present study, novel magnetic Zinc Ferrite Pine Cone composite was prepared and used for the efficient removal of Crystal Violet, Malachite Green and Methylene Blue (Dye) from aqueous solution in single and ternary dye system. Various characterization techniques such as FTIR (Fourier Transform Infrared Spectroscopy), XRD (X-Ray Diffraction), FE-SEM (Field Emission Scanning Electron Microscopy), EDS (Energy Dispersive Spectroscopy), TGA (Thermogravimetric Analysis) and BET (Brunauer-Emmett-Teller Analysis) are used for the structure elucidation of Zinc Ferrite and Zinc Ferrite Pine cone (Composite). Batch adsorption method was used for the removal of dyes in single and ternary dye system. Lagergren pseudo second order adsorption model fits best in the kinetic studies whereas, Langmuir adsorption isotherm showed better results with maximum adsorption capacity 76.33, 200 and 94.33 mg/g for single dye system and 9.46, 20.45 and 27.93 mg/g respectively in ternary dye system for dyes CV, MG and MB. Thermodynamic study confirmed about the spontaneous nature of adsorption process. The regeneration ability of the composite in both the systems was studied up to five cycles. So, it becomes clear that the composite (Zinc Ferrite Pine Cone) will work as best alternative for dyes removal in single and ternary dye system. � 2023 Elsevier B.V.
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    Removal of hexavalent chromium from aqueous solution using biomass derived fly ash from Waste-to- Energy power plant
    (Taylor & Francis, 2013) Vaid, Upma; Mittal, Sunil; Babu, J. Nagendra
    Fly ash from the agricultural waste-based Energy Power Plant has been studied for the adsorption of hexavalent chromium [Cr(VI)]. In order to maximize the Cr(VI) removal from simulated aqueous solutions, effects of various parameters i.e. adsorbent dose (10–40 g/L), contact time (5–90 min), variation in pH (1–5), and initial metal ion concentration (10–80 mg/L) on Cr(VI) adsorption were investigated by batch adsorption experiments. It was observed that adsorption of Cr(VI) on the selected adsorbent was dependent on pH. Before optimization of experimental conditions, the percent removal of Cr(VI) from the aqueous solution (10 mg Cr/L) was approximately 4%, which increased to approximately 99% after optimization of experimental conditions. Maximum adsorption was observed upon adding 10 g/L of adsorbent to a 60 mg Cr/L aqueous solution at pH 1.0 and contact time of 90 min at 200 rpm. Equilibrium adsorption data were well fitted in Langmuir isotherm model which substantiate monolayer adsorption of Cr(VI) on fly ash. Kinetics of Cr(VI) adsorption on fly ash follows pseudo-second-order reaction.
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    Removal of hexavalent chromium from aqueous solution: a comparative study of cone biomass of “Picea smithiana” and activated charcoal
    (Taylor & Francis, 2016) Mittal, Sunil; Vaid, Upma; Najar, Gh Nabi; Babu, J. Nagendra
    The present work investigates comparative adsorption efficiency of powdered cone biomass of Picea smithiana (PCBP) and activated charcoal (AC) for removal of hexavalent chromium (Cr) (Cr(VI)) from aqueous solution. The study indicates that PCBP has 76% removal efficiency for Cr as compared to AC. Particle size and SEM-EDX analyses were done to determine average particle size, surface morphology and elemental composition of PCBP. BET and FTIR analysis were carried out to elucidate the adsorption mechanism of Cr(VI) on PCBP. Ashing has been proposed as a method for managing waste of loaded PCBP generated in adsorption. Ashing studies showed the ash content of PCBP to contribute only 13% of the ash generated from loaded biomass. Further, a comparative study has been made indicating the adsorption efficiency of PCBP with previously reported bio-waste materials. The results of this study show that PCBP has high adsorption efficiency as compared to other bio-waste materials.