ORCID Profile
0000-0003-3542-6485
Current Organisations
RMIT University
,
National Physical Laboratory CSIR
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Publisher: American Chemical Society (ACS)
Date: 03-03-2023
Publisher: Austin Publishing Group
Date: 30-03-2022
DOI: 10.26420/AUSTINENVIRONSCI.2022.1074
Abstract: Management of wastewater in a suitable way is the dire need of today. Wastewater contains varieties of contaminants, which make water toxic and unfit for re-usable. Heavy metals contribute to a large part of water contamination and Chromium (VI) is a major toxic heavy metal which usually found in wastewater. Many synthetic adsorbents such as metal oxides, chelating agents are reported having high adsorption capacity and high removal efficiency, but disposal of such synthetic adsorbents is a problem due to their non-biodegradable nature. This limitation of synthetic adsorbents results in the use of natural products and by products as the adsorbents for removal of Chromium (VI) from wastewater. In past decades a lot of work has been done for water purification especially for the removal of Chromium (VI) metals by utilizing natural products. But all these information is scattered. Herein, an attempt is made to present the scattered information into a systematic way in the form of review article. In this review, hexavalent form of chromium removal by low-cost natural products and by products is summarized.
Publisher: Elsevier BV
Date: 09-2023
Publisher: American Chemical Society (ACS)
Date: 18-10-2022
DOI: 10.26434/CHEMRXIV-2022-8M2Z7
Abstract: Wastewater treatment is becoming increasingly important due to the potential shortage of pure drinking water in many parts of the world. Adsorption offers a potential technique for the uptake of contaminants and wastewater purification. In the last two decades, several efforts have been made to remove fast green (FG) dye from wastewater via different adsorbent materials. But adsorption capacity shown by these adsorbents is low and is time-consuming. Herein, we have synthesized for the first time a new powdered adsorbent ZnOS+C, modified Zinc peroxide with sulfur and activated carbon to effectively remove FG dye from wastewater. Results of batch adsorption experiments have suggested that ZnOS+C has the maximum adsorption capacity of 238.28 mg/g for FG dye within 120 minutes of adsorption equilibrium for a wide range of pH ranging from 2-10 pH. The adsorption process follows the Freundlich isotherm model, suggesting a multilayered adsorption process that occurs on the surface of ZnOS+C. The adsorption kinetics study indicates that the kinetics of the reaction is the intraparticle diffusion model. Briefly, this study shows the proof of application of ZnOS+C powder as a new eco-friendly adsorbent with extremely high efficiency and high surface area for removing FG dye.
Publisher: MDPI AG
Date: 30-01-2023
DOI: 10.3390/NANO13030566
Abstract: ZnO nanoparticles (NPs) show remarkable efficiency in removing various contaminants from aqueous systems. Doping ZnO NPs with a second metal element can dramatically change the physicochemical properties of the pristine nanoparticles. However, there have been limited reports on the absorption of doped ZnO NPs, especially comparing the performance of ZnO NPs with different doping elements. Herein, ZnO NPs were doped with three transitional metals (Co, Fe, and Mn) at a nominal 2 wt.%. The particle surface had a higher dopant concentration than the interior for all NPs, implying the migration of the dopants to the surface. Because doping atoms inhibited grain growth, the doped ZnO NPs had a small particle size and a large surface area. The adsorption performance followed the order of Fe-doped undoped Mn-doped Co-doped ZnO. Co-doped ZnO had an increased surface area and less tendency to agglomerate in an aqueous solution, showing the best adsorption performance. The adsorption of Congo red (CR) on Co-doped ZnO followed the pseudo-second-order model and the Langmuir isotherm. The adsorption process was spontaneous through monolayer chemisorption, and the maximum adsorption capacity was 230 mg/g. Finally, the Co-doped ZnO was successfully incorporated into an alginate membrane by electrospinning. The membrane demonstrated excellent adsorption performance and had great potential as an innovative and low-cost adsorbent (inexpensive raw materials and simple processing) for wastewater purification.
Publisher: Elsevier BV
Date: 06-2023
Publisher: American Chemical Society (ACS)
Date: 24-08-2021
No related grants have been discovered for Sachin Yadav.