期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 805, 期 -, 页码 41-49出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.06.331
关键词
AgIn5S8/Bi2WO6; Z-scheme heterojunction; Photocatalytic degradation; Cr(VI) reduction; Industrial wastewater treatment
资金
- Natural Science Foundation of China [51741806, 51720105001, 51178213, 51238002]
- Science Fund for Excellent Young Scholars of Jiangxi Province [20162BCB23038]
Bifunctional Z-scheme AgIn5S8/Bi2WO6 nano-heterojunctions with excellent performance for photocatalytic degradation of refractory pharmaceutical contaminants and reduction of aqueous Cr(VI) were synthesized by solvothermal method. The photocatalytic degradation performance of AgIn5S8/Bi2WO6 heterojunctions is related with the AgIn5S8 content, and the optimal decomposition efficiency of tetracycline hydrochloride (TC center dot HCl) aqueous solution by 10% AgIn5S8/Bi2WO6 under visible-light irradiation reached 92% within 2 h, which is much higher than that of single AgIn5S8 (53%) and Bi2WO6 (67%) nanoflower. The highest photocatalytic degradation performance of 10% AgIn5S8/Bi2WO6 nano-heterojunction can be put down to the most efficacious separation of photoexcited electrons and holes, and the extremely positive valence band potential of Bi2WO6. The reduction efficiency of Cr(VI) by 10% AgIn5S8/Bi2WO6 heterojunction is more than two times that of pure Bi2WO6, while is still lower than that of pure AgIn5S8, which can be interpreted by the Z-scheme path of e-h transfer in AgIn5S8/Bi2WO6 heterojunctions and the further oxidation of Cr(III) by hydroxyl radicals. The COD removal efficiency of pharmaceutical industry wastewater by the photocatalysis of Z-scheme AgIn5S8/Bi2WO6 heterojunctions reached 77%, indicating that the developed Z-scheme AgIn5S8/Bi2WO6 heterojunctions are promising in efficacious disposal of refractory pharmaceutical contaminants and Cr(VI) in water. (C) 2019 Elsevier B.V. All rights reserved.
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