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Efficient Selective Sorption of Cationic Organic Pollutant from Water and Its Photocatalytic Degradation by AlVO4/g-C3N4 Nanocomposite

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This study reports the synthesis, characterization and water remediation application of novel AlVO4/g-C3N4 nanocomposites. The nanocomposite has been synthesized by a low temperature solid-state reaction using graphitic carbon nitride (g-C3N4) obtained via calcination of melamine and AlVO4 prepared via assisted sonochemical technique. Powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier Transform Infrared spectroscopy (FTIR), ultraviolet-visible diffuse reflection spectroscopy (UV-vis DRS), and the N2 gas adsorption Brunauer–Emmett–Teller (BET) method has been used to characterize the pristine and composite samples. AlVO4 and g-C3N4 interact with each other forming a hybrid composite, which shows excellent ability for selective sorption of cationic MB (methylene blue) dye from wastewater. The initial dye concentration, pH and amount of sorbent has been varied and their effect on the adsorption process has been analysed. The photocatalytic efficiency of the MB dye adsorbed pristine g-C3N4, AlVO4:g-C3N4 (1:3) and AlVO4:g-C3N4 (1:1) composite has been tested under visible light. With increased proportion of AlVO4 in the samples, the photocatalytic efficiency improved and the best photodegradation has been observed for the AlVO4:g-C3N4 (1:1) sample. Photoluminescence (PL) studies, photocurrent response measurements and electrochemical impedance spectroscopy (EIS) indicates enhanced separation of the photogenerated electron/hole pairs leading to effective degradation of the MB dye solution in case of the AlVO4:g-C3N4 (1:1) composite sample. The photocatalytic mechanism has been elucidated and it could be inferred that photogenerated holes and superoxide anion radicals play a major role in the photocatalysis process.
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Keywords: AlVO4; MB Dye; Nanocomposite; Photocatalytic Degradation; Sorption; g-C3N4

Document Type: Research Article

Affiliations: 1: Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India 2: Department of Applied Chemistry, Amity University, Gurgaon, Haryana 122413, India

Publication date: April 1, 2020

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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