Photocatalysis is considered a promising strategy for environmental remediation, and the preparation of an efficient, stable, and green photocatalyst is a current urgent need. In this work, a magnetically recoverable SnFe 2 O 4 /Bi 2 WO 6 (SFO/BWO) Z-scheme heterojunction was successfully prepared by a simple one-step hydrothermal process. The prepared 7.5%SFO/BWO nanocomposite exhibited excellent photocatalytic performance, with a degradation efficiency of 96.12% for Rhodamine B (RhB) within 120 min, which were respectively 1.64 and 2.07 times greater than that of pure Bi 2 WO 6 (BWO) and SnFe 2 O 4 (SFO). This obvious improvement in the photocatalytic performance benefited from the increase in the separation efficiency of photogenerated carriers and was based on the construction of Z-scheme heterojunction. Additionally, the radical capture tests demonstrated the main reactive radicals were electron (e − ), hole (h + ), and hydroxy radical (•OH) in the photodegradation system. Furthermore, the composite retains excellent photocatalytic performance after five cycles and is easily recoverable due to its magnetic behavior. Notably, during the toxicity assessment, it was proved that SnFe 2 O 4 /Bi 2 WO 6 could be used to eliminate the toxicities of dyes and antibiotics rapidly. Consequently, SnFe 2 O 4 /Bi 2 WO 6 is a promising and competitive photocatalyst in wastewater remediation.
Xiaoqian Chen,Xingliang Chen,Binglin Li,Jixian Ma,Binxia Zhao,Nan Shao,Yuqi Wang
A magnetic ternary double Z-scheme ATP-g-C 3 N 4 /SnFe 2 O 4 /Bi 2 WO 6 (AG/SFO/BWO) heterojunction was prepared by a simple and green hydrothermal process, which was successfully used in the dye degradation . AG/7.5 %SFO/BWO catalyst demonstrated outstanding visible-light-induced degradation, achieving an impressive 96.72 % degradation of rhodamine B (RhB) in 2 h. Compared with Bi 2 WO 6 (BWO) and SnFe 2 O 4 /Bi 2 WO 6 (SFO/BWO), the degradation efficacy was increased about 1.65 and 1.16 times, respectively. After being used for five batches, the degradation rate of RhB remained over 90 %. Moreover, AG/7.5 %SFO/BWO showcased remarkable efficacy in degrading methylene blue (MB), Congo red (CR), and tetracycline (TC). Bacterial toxicity test indicated the toxicity of dyes was rapidly decreased in 24 h. Physicochemical properties and morphological characteristics of the prepared photocatalysts were investigated by various methods, including XRD , FTIR, XPS , SEM, TEM , BET, VSM , UV–vis, and EIS . AG/7.5 %SFO/BWO, utilizing a dual-Z scheme pathway, efficiently absorbed broad light, yielding multiple active agents, primarily hole (h + ) and superoxide radical •O 2 − . The double Z-scheme heterojunction structure enhanced the electron-hole separation and ensured a stable photochemical environment. UPLC-HRMS was used to identify intermediates during the RhB degradation. Its degradation pathway and catalytic mechanism were illustrated systematically. The bio-toxicity (acute toxicity, developmental toxicity, and mutagenicity) of the intermediates was also evaluated by T.E.S.T.
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