期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 628, 期 -, 页码 100-108出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.07.107
关键词
Photocatalysis; Cr remediation; In-situ adsorption; Polymer engineering
资金
- Key Laboratory of Hubei Province for Coal Conversion and New Carbon Materials (Wuhan University of Science and Technology)
- Natural Science Foundation of Hubei Province [2020CFB124]
- National Natural Science Foundation of China [22102126, 32171728]
This study demonstrates an efficient all-in-one removal method for chromium-containing wastewater by concurrently reducing Cr(VI) to Cr(III) and fixing Cr(III) in-situ using a nonconjugated polymer engineered ZnIn2S4 (P-ZIS) photocatalyst. The P-ZIS catalyst shows enhanced light absorption, uplifted conduction band, and accelerated charge carrier transfer compared to pure ZIS, resulting in a faster Cr(VI) reduction kinetics. Additionally, P-ZIS exhibits significantly improved in-situ adsorption capability for Cr(III), enabling total Cr elimination within a single system.
Chromium (Cr)-containing wastewater has caused a serious threat to the environment due to its high toxicity and mobility. The traditional Cr removal methods are generally based on an inconvenient two-step process with the first transformation of Cr(VI) to Cr(III) and the consecutive removal of Cr(III) by precipitation. Herein, we demonstrate the efficient all-in-one removal of total Cr through the simultaneous photocatalytic reduction of Cr(VI) to Cr(III) and in-situ fixation of Cr(III) over the nonconjugated polymer engineered ZnIn2S4 (P-ZIS) photocatalyst. By in-situ polyvinylpyrrolidone (PVP) modification of ZIS during the preparation process, the resulted P-ZIS can completely reduce Cr(VI) within 60 min under visible light irradiation. The kinetics of Cr(VI) reduction over P-ZIS is 2.8 times as that of pure ZIS, which is proved to be benefited from the enhanced light absorption, uplifted conduction band for strengthening reducibility, and accelerated charge carrier transfer. Moreover, as compared to ZIS, P-ZIS also exhibits significantly improved in-situ adsorption ability for Cr(III), thus resulting in efficient all-in-one elimination of total Cr within a single system. We show that this polymer engineered strategy could be a facile and versatile protocol for modulating the electronic structure and surface chemistry of the semiconductor photocatalysts towards complete, safe, and cost-efficient removal of Cr. (C) 2022 Elsevier Inc. All rights reserved.
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