Abstract
Abstract Supported photocatalysis is emerging as an effective technology to overcome the inherent drawback of metallic photocatalyst. In the present work, heterojunctioned Bi 2 WO 6 /Fe 3 O 4 was synthesized by hydrothermal method. Bi 2 WO 6 /Fe 3 O 4 was supported over graphene sand composite (GSC) by in situ wet impregnation method to report Bi 2 WO 6 /Fe 3 O 4 /GSC nanocomposite. The morphological and compositional characteristics of prepared Bi 2 WO 6 /Fe 3 O 4 /GSC nanocomposite were explored by FESEM, TEM, HRTEM, FTIR, XRD, EDX and UV–vis spectral analysis. The photocatalytic efficiency of synthesized Bi 2 WO 6 /Fe 3 O 4 /GSC composites was evaluated for mineralization of oxytetracycline (OTC) and ampicillin (AMP) under solar light. The adsorption of both OTC and AMP onto Bi 2 WO 6 /Fe 3 O 4 /GSC followed pseudo second order kinetics. The synergistic adsorption and photocatalysis (A + P) was most efficient process for oxytetracycline and ampicillin removal and resulted in higher degradation of antibiotics. During A + P process, OTC and AMP were mineralized to CO 2 , H 2 O and NO 3 − ions. Power law model was applied to explore the kinetics of mineralization process. The super paramagnetic nature of photocatalyst was revealed by hysteresis curve. Bi 2 WO 6 /Fe 3 O 4 /GSC nanocomposite displayed improved adsorption capacity and easy separation from reaction mixture with significant recycle efficiency for 10 successive catalytic cycles.
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