E‐Waste Based V₂O₅/RGO/Pt Nanocomposite for Photocatalytic Degradation of Oxytetracycline

Abstract

The increasing prevalence of antibiotics in the environment has promoted the development of antibiotic resistant microorganisms, and novel approaches are needed to effectively remove antibiotics from water and mitigate this worldwide problem. A reduced graphene oxide‐V2O5 (RGOV) nanocomposite was synthesized and used for photocatalytic degradation of the antibiotic oxytetracycline (OTC) in aqueous solution. The Sol–Gel method was employed for V2O5 synthesis from e‐waste‐based vanadium nitrate, and a one pot solvothermal method was used to synthesize RGOV. Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction spectroscopy (XRD), transmission electron microscopy (TEM) with energy dispersive analysis of X‐rays (EDAX) confirmed V‐O‐C bonds on the surface of the RGOV nanocomposites. A decrease in the band gap of V2O5 from 2.21 to 2.13 eV was supported by diffuse reflectance ultraviolet–visible spectrophotometry. OTC adsorption onto the nanocomposite increased with an increase in RGO concentration and saturated at 17% for RGOV with 30% graphene oxide. The composite degraded 90% of the OTC present in aqueous solution (50 mg/L). Platinum (1%) doping further increased OTC degradation by the nanocomposite to 98.7%. Optimum conditions for maximum OTC degradation are (1) an initial OTC concentration of 50 mg/L, (2) a RGOV nanocomposite dose of 0.5 g/L, and (3) a 40 min incubation time. Our results support the potential use of RGOV nanocomposite for OTC photodegradation. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13123, 2019

V2O5/RGO/Pt nanocomposite on oxytetracycline degradation and pharmaceutical effluent detoxification

“…Figure (A) shows the XRD patterns of V 2 O 5 nanorods and RGOV‐Pt(1%). The sharp diffraction peaks originating from RGO and RGOV‐Pt(1%) are in good agreement with our previous study . The XRD spectrum of V 2 O 5 is an indicator of the crystallinity of the synthesized photocatalyst.…”

“…V 2 O 5 and RGOV‐Pt(1%) were synthesized as proposed by Mohan et al . In brief, a 2:1 molar ratio solution of vanadium nitrate and citric acid was constantly stirred with 50 mL of water for 12 h and then refluxed for 3 h followed by washing and drying to obtain V 2 O 5 powder.…”

“…Photocatalytic degradation of OTC was performed in an immersion well batch photoreactor with a 150 W xenon lamp (185–2000 nm) under previously optimized conditions: (i) an initial OTC concentration of 50 mg L −1 ; (ii) an RGOV‐Pt(1%) nanocomposite dose of 0.5 g L −1 ; (iii) 40 min of irradiation (results shown in supporting information, Fig. S1(A)).…”

“…In our earlier study, a reduced graphene oxide‐V 2 O 5 (RGOV) nanocomposite was synthesized using the sol–gel and one‐pot solvothermal method doped with platinum and was subsequently assessed for the photocatalytic degradation of OTC. The results showed that the RGOV‐Pt(1%) nanocomposite degraded 98.7% of OTC (50 mg L −1 ) in aqueous solution . However, the influence of salts and other auxiliary chemicals on the photocatalytic degradation of OTC was not assessed.…”

Enhanced visible light photocatalysis with E‐waste‐based V2O5/zinc–ferrite: BTEX degradation and mechanism

“…Intermediate mixture of metal–citrate was prepared by constant stirring of 2:1 molar ratio solution of vanadium nitrate and citric acid in distilled water (50 mL) at 50 °C for 12 h, followed by 60 min refluxing, chelating to the metal oxide as a means to ensure uniform distribution of the metal ion in the reaction mixture . The reaction mixture was dried at 200 °C for 3 h. The resultant V 2 O 5 powder was washed, vacuum‐dried at 60 °C for 2 h and used for further studies.…”