Publication Date:
2019
Description:
〈p〉Publication date: Available online 23 November 2019〈/p〉
〈p〉〈b〉Source:〈/b〉 Water Resources and Industry〈/p〉
〈p〉Author(s): Bushra Fatima, Sharf Ilahi Siddiqui, Rabia Ahmed, Saif Ali Chaudhry〈/p〉
〈div xml:lang="en"〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉Cadmium tungstate, CdWO〈sub〉4〈/sub〉, is well-known semiconductor which exhibit good photocatalytic properties but its preparation is usually carried out at very high temperature. Hardly any report is available for its preparation through green route, and its application for water treatment. Therefore, the functionalized cadmium tungstate, f-CdWO〈sub〉4〈/sub〉, nanoparticles synthesis through green, environmentally benign route using 〈em〉Brassica rapa〈/em〉 leave extract and sodium tungstate and cadmium iodide was objective of the present work. The formation of f-CdWO〈sub〉4〈/sub〉 was confirmed from FT-IR, XRD, and TEM, SEM and UV/Visible spectroscopic techniques. The average size of 54 nm was calculated from XRD analysis, 37.23 nm radius was determined from UV-Visible spectrum, whereas average 27 nm breadth and 120 nm length was found from TEM imaging showing rod shaped f-CdWO〈sub〉4〈/sub〉 nanoparticles. The f-CdWO〈sub〉4〈/sub〉 was used for removal of toxic Bismarck brown R dye from aqueous solution through adsorption and photocatalytic degradation under sun light. The coloured water containing 10 mgL〈sup〉−1〈/sup〉 concentration of dye could be cleaned with 1.5 gL〈sup〉-1〈/sup〉 dose of f-CdWO〈sub〉4〈/sub〉 at optimum condition. The adsorption capacity of f-CdWO〈sub〉4〈/sub〉 for Bismarck brown R was found to be 46.5, 49.50, and 51.54 mgg〈sup〉−1〈/sup〉 at 30, 40 and 50 °C, respectively. The endothermic adsorption of Bismarck brown R followed pseudo-second order kinetics. The interaction between f-CdWO〈sub〉4〈/sub〉 and Bismarck brown R, on molecular level, was investigated from FT-IR studies clubbed with isotherm, kinetics, and thermodynamics. The f-CdWO〈sub〉4〈/sub〉 also showed good photocatalytic degradation activity and degraded 82.70% of Bismarck brown R in 50 mL solution having 20 mgL〈sup〉−1〈/sup〉 dye concentration, with 1.5 gL〈sup〉-1〈/sup〉 dosage of f-CdWO〈sub〉4〈/sub〉. Therefore, f-CdWO〈sub〉4〈/sub〉, prepared through green route, would be efficient for water treatment through both photocatalytic and adsorption activities.〈/p〉〈/div〉
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〈h5〉Graphical abstract〈/h5〉
〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S2212371719300915-fx1.jpg" width="335" alt="Image 1" title="Image 1"〉〈/figure〉〈/p〉〈/div〉
Electronic ISSN:
2212-3717
Topics:
Architecture, Civil Engineering, Surveying
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Geography
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Process Engineering, Biotechnology, Nutrition Technology
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