Photocatalytic removal of Cr（Ⅵ） from water by Bi2S3-BiOI heterojunctions

doi:10.19965/j.cnki.iwt.2023-0025

Abstract

Abstract:

Recently，photocatalytic reduction of Cr（Ⅵ） has been extensively studied. Bi₂S₃-BiOI heterojunction photocatalysts were prepared by hydrothermal method，and the removal efficiency of Bi₂S₃，BiOI and Bi₂S₃-BiOI heterojunction for Cr（Ⅵ） under visible light was investigated comparatively. It was found that the efficiency of photocatalytic reduction of Cr（Ⅵ） could be substantially enhanced by combining Bi₂S₃ and BiOI as heterojunctions. Under the optimal conditions（preparation pH 8，Na₂S₂O₃⋅5H₂O dosage 2 mmol，pollutant pH 3，catalyst dosage 0.5 g/L），Bi₂S₃-BiOI heterojunction could achieve 100% Cr（Ⅵ） removal rate within 12 min，and the first-order reaction rate constants of Cr（Ⅵ） photoreduction were 40.3 and 116.6 times of Bi₂S₃ and BiOI，respectively. The formation process and photoelectric properties of Bi₂S₃-BiOI heterojunctions were revealed by a series of characterizations，and the mechanism of photocatalytic reduction of Cr（Ⅵ） was proposed. Bi₂S₃-BiOI heterojunction had good stability and reusability，and Cr（Ⅵ） could be effectively removed after repeated utilization for 5 times. Therefore，a novel Bi₂S₃-BiOI heterojunction photocatalyst was synthesized to provide a new idea for the efficient removal of Cr（Ⅵ） from water.

Key words: Bi₂S₃, BiOI, heterojunction, photocatalysis, chromium-containing wastewater

摘要：

近年来，利用光催化剂还原Cr（Ⅵ）的研究受到广泛关注。利用水热法制备了Bi₂S₃-BiOI异质结光催化剂，对比分析了Bi₂S₃、BiOI及Bi₂S₃-BiOI异质结在可见光下去除Cr（Ⅵ）的效果。研究发现，Bi₂S₃和BiOI结合为异质结后，光催化还原Cr（Ⅵ）的效率得到大幅提升，在最佳条件（制备pH为8，Na₂S₂O₃·5H₂O添加量为2 mmol，污染物pH为3，催化剂投加量为0.5 g/L）下，Bi₂S₃-BiOI异质结可在12 min内实现100%的Cr（Ⅵ）去除率，光还原Cr（Ⅵ）的一级反应速率常数分别为Bi₂S₃和BiOI的40.3倍和116.6倍。通过一系列表征分析，揭示了Bi₂S₃-BiOI异质结的形成过程和光电性能，并提出了Bi₂S₃-BiOI异质结光催化还原Cr（Ⅵ）的机理。Bi₂S₃-BiOI异质结具有良好的稳定性和重复利用性，重复利用5次后仍能有效去除Cr（Ⅵ）。本研究合成的新型Bi₂S₃-BiOI异质结光催化剂为高效去除水中Cr（Ⅵ）提供了一个新思路。

关键词: Bi₂S₃, BiOI, 异质结, 光催化, 含铬废水

CLC Number:

X703
TB34

Zeqing LONG, Hui SONG, Guang XIAN, Chao CHEN, Caiyun WANG. Photocatalytic removal of Cr（Ⅵ） from water by Bi₂S₃-BiOI heterojunctions[J]. Industrial Water Treatment, 2023, 43(10): 109-116.

龙泽清, 宋慧, 仙光, 陈超, 王彩云. Bi₂S₃-BiOI异质结光催化去除水中Cr（Ⅵ）的研究[J]. 工业水处理, 2023, 43(10): 109-116.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2023-0025

https://www.iwt.cn/EN/Y2023/V43/I10/109

Figures/Tables 11

Fig. 1 Cr（Ⅵ） removal efficiency （a） and first-order kinetic fitting （b） by different photocatalysts

Fig. 2 Cr（Ⅵ） removal efficiency （a） and first-order kinetic fitting （b） of photocatalysts prepared with different sulfur concentrations

Fig. 3 Effect of pollutant pH on Cr（Ⅵ） removal efficiency

Fig. 4 Effect of catalyst dosage on Cr（Ⅵ） removal efficiency

Fig. 5 XRD of BiOI prepared at different pH （a） and 2-Bi₂S₃-BiOI （b）

Fig. 6 SEM and TEM of Bi₂S₃，BiOI and 2-Bi₂S₃-BiOI

Fig. 7 XPS of 2-Bi₂S₃-BiOI

Fig. 8 The UV-Vis DSR （a） and band gap （b） of the photocatalysts

Fig. 9 PL spectras of Bi₂S₃-BiOI heterojunctions

Fig. 10 Mechanism of photocatalytic reduction of Cr（Ⅵ） by Bi₂S₃-BiOI heterojunction

Fig. 11 Effect of recycling times of 2-Bi₂S₃-BiOI on the removal rate of Cr（Ⅵ）（a），XRD （b） and SEM （c） of 2-Bi₂S₃-BiOI after reaction

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Photocatalytic removal of Cr（Ⅵ） from water by Bi₂S₃-BiOI heterojunctions

Bi₂S₃-BiOI异质结光催化去除水中Cr（Ⅵ）的研究

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