工业水处理 ›› 2023, Vol. 43 ›› Issue (10): 109-116. doi: 10.19965/j.cnki.iwt.2023-0025

• 试验研究 • 上一篇    下一篇

Bi2S3-BiOI异质结光催化去除水中Cr(Ⅵ)的研究

龙泽清1(), 宋慧2(), 仙光3, 陈超4, 王彩云1   

  1. 1. 长治医学院公共卫生与预防医学系,山西 长治 046000
    2. 山西航天清华装备有限责任公司,山西 长治 046000
    3. 陆军勤务学院勤务指挥系,重庆 401331
    4. 长治医学院附属和平医院,山西 长治 046000
  • 收稿日期:2023-07-04 出版日期:2023-10-20 发布日期:2023-10-18
  • 作者简介:

    龙泽清(1990— ),博士,讲师。电话:18801206268,E-mail:

    宋慧,硕士,工程师。电话:15735536008,E-mail:

  • 基金资助:
    山西省高等学校科技创新项目(2022L361); 重庆市教委科学技术研究项目(KJQN202212902)

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

Zeqing LONG1(), Hui SONG2(), Guang XIAN3, Chao CHEN4, Caiyun WANG1   

  1. 1. Department of Public Health and Preventive Medicine,Changzhi Medical College,Changzhi 046000,China
    2. Shanxi Aerospace Tsinghua Equipment Co. ,Ltd. ,Changzhi 046000,China
    3. Logistics Command Department,Army Logistics Academy,Chongqing 401331,China
    4. Affiliated Heping Hospital,Changzhi Medical College,Changzhi 046000,China
  • Received:2023-07-04 Online:2023-10-20 Published:2023-10-18

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

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

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