Photoelectrocatalytic Degradation of Methylene Blue on Electrodeposited Bismuth Ferrite Perovskite Films.

Autor: Nkwachukwu OV; Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, South Africa.; Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein 2028, South Africa., Muzenda C; Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, South Africa.; Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein 2028, South Africa., Jayeola KD; Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, South Africa.; Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein 2028, South Africa., Sebokolodi TI; Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, South Africa.; Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein 2028, South Africa., Sipuka DS; Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, South Africa.; Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein 2028, South Africa., Cretin M; IEM (Institute Européen des Membranes), UMR 5635, CNRS, ENSCM, UM, Université de Montpellier, Place E. Bataillon, F-34095 Montpellier CEDEX 5, France., Zhou M; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China., Nkosi D; Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, South Africa.; Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein 2028, South Africa., Arotiba OA; Department of Chemical Sciences, University of Johannesburg, Doornfontein 2028, South Africa.; Centre for Nanomaterials Science Research, University of Johannesburg, Doornfontein 2028, South Africa.
Jazyk: angličtina
Zdroj: Materials (Basel, Switzerland) [Materials (Basel)] 2023 Mar 30; Vol. 16 (7). Date of Electronic Publication: 2023 Mar 30.
DOI: 10.3390/ma16072769
Abstrakt: Electrodeposited bismuth ferrite (BiFeO 3 ) thin films on fluorine-doped tin oxide (FTO) substrate were employed as photoanodes in the photoelectrocatalytic degradation of methylene blue. The BiFeO 3 thin films electrodeposited for 300 s, 600 s, 1200 s, 1800 s and 3600 s were characterised with XRD, field emission scanning electron microscopy (FESEM) and UV-vis diffuse reflectance spectroscopy. SEM images displayed different morphology at different electrodeposition times which affects the photoelectrocatalytic (PEC) performances. The FESEM cross-sectional area was used to measure the thickness of the film. The optical properties showed that the band gaps of the photoanodes were increasing as the electrodeposition time increased. The photocurrent response obtained showed that all thin film photoanodes responded to visible light and lower charge transfer resistance (from electrochemical impedance spectroscopy studies) was observed with photoanodes electrodeposited at a shorter time compared to those at a longer time. The PEC application of the photoanode for the removal of methylene blue (MB) dye in water showed that the percentage degradation decreased with an increase in electrodeposition time with removal rates of 97.6% and 70% observed in 300 s and 3600 s electrodeposition time, respectively. The extent of mineralisation was measured by total organic carbon and reusability studies were carried out. Control experiments such as adsorption, photolysis, photocatalysis and electrocatalysis processes were also investigated in comparison with PEC. The electrodeposition approach with citric acid exhibited improved electrode stability while mitigating the problem of catalyst leaching or peeling off during the PEC process.
Databáze: MEDLINE
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