ZnIn2S4/SnS23D异质结的制备及其在可见光下高效还原Cr(VI)的应用

doi:10.1016/S1872-2067(19)63422-4

催化学报 ›› 2020, Vol. 41 ›› Issue (1): 200-208.DOI: 10.1016/S1872-2067(19)63422-4

ZnIn₂S₄/SnS₂3D异质结的制备及其在可见光下高效还原Cr(VI)的应用

潘静文, 关中杰, 杨建军, 李秋叶

河南大学纳米材料工程研究中心, 河南开封 475004

收稿日期:2019-04-11 修回日期:2019-06-03 出版日期:2020-01-18 发布日期:2019-10-22
通讯作者: 关中杰, 李秋叶
基金资助:
国家自然科学基金（51702087，21673066）；中国博士后科学基金（2019M652516）；南京大学纳米技术江苏省重点实验室开放研究基金.

Facile fabrication of ZnIn₂S₄/SnS₂ 3D heterostructure for efficient visible-light photocatalytic reduction of Cr(VI)

Jingwen Pan, Zhongjie Guan, Jianjun Yang, Qiuye Li

Engineering Research Center for Nanomaterials, Henan University, Kaifeng 475004, Henan, China

Received:2019-04-11 Revised:2019-06-03 Online:2020-01-18 Published:2019-10-22
Contact: S1872-2067(19)63422-4
Supported by:
The authors gratefully acknowledge the support of the National Natural Science Foundation of China (51702087 and 21673066), Project funded by China Postdoctoral Science Foundation (2019M652516), and the Open Research Fund of Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University.

摘要/Abstract

摘要： 随着印染、纺织和镀铬等行业的不断发展，含有六价铬（Cr（VI））工业废水的大量排放造成严重的环境污染，威胁着人类健康.在过去的几十年中，废水中Cr（VI）去除的方法有很多，其中包括离子交换、膜分离、化学沉淀和吸附等.然而，这些传统的方法存在成本高、能耗高、效率低或者去除不彻底等缺点，阻碍了其广泛应用.在此背景下，光催化还原作为一种高效、绿色、有应用前景的Cr（VI）废水处理方法，受到越来越多科学家的关注.开发高效可见光响应光催化剂是实现光催化还原Cr（VI）应用的关键.ZnIn₂S₄是一种三元硫化物半导体材料，具有较强可见光吸收能力.但纯ZnIn₂S₄光生载流子复合严重以及可见光响应范围较窄导致其光催化性能较低.为了解决这一问题，构建异质结是一种常见的有效方法.SnS₂具有合适的带隙（~2.2eV），价格低廉，无毒且可见光吸收能力强.因此，构建ZnIn₂S₄/SnS₂异质结有望实现高效可见光催化还原Cr（VI）.
本文通过简单的水热法成功制备了ZnIn₂S₄/SnS₂三维（3D）异质结，并在可见光照射下对催化剂还原Cr（VI）性能进行了评价.实验结果显示，ZnIn₂S₄/SnS₂ 3D异质结光催化活性随着SnS₂含量增加呈现先增加后减少的趋势.当SnS₂与ZnIn₂S₄的质量比为1：10时，ZnIn₂S₄/SnS₂3D异质结催化还原Cr（VI）效率最高.可见光照射下反应70min，Cr（VI）（50mg/L）的还原效率达到100%，远高于纯ZnIn₂S₄和SnS₂.荧光光谱分析（PL）和紫外-可见吸收光谱（UV-Vis）显示，光生载流子分离效率和光吸收效率的增强是还原Cr（VI）性能增加的两个原因.此外，经过三个周期的循环实验，ZnIn₂S₄/SnS₂3D异质结催化还原Cr（VI）效率没有明显降低，表现出较好的光催化稳定性.

关键词: ZnIn₂S₄/SnS₂三维异质结, 光催化还原Cr (VI), 可见光响应, 电荷分离, 光催化稳定性

Abstract: Photocatalytic method has been intensively explored for Cr(VI) reduction owing to its efficient and environmentally friendly natures. In order to obtain a high efficiency in practical application, efficient photocatalysts need to be developed. Here, ZnIn₂S₄/SnS₂ with a three-dimensional (3D) heterostructure was prepared by a hydrothermal method and its photocatalytic performance in Cr(VI) reduction was investigated. When the mass ratio of SnS₂ to ZnIn₂S₄ is 1:10, the ZnIn₂S₄/SnS₂ composite exhibits the highest photocatalytic activity with 100% efficiency for Cr(VI) (50 mg/L) reduction within 70 min under visible-light irradiation, which is much higher than those of pure ZnIn₂S₄ and SnS₂. The enhanced charge separation and the light absorption have been confirmed from the photoluminescence and UV-vis absorption spectra to be the two reasons for the increased activity towards photocatalytic Cr(VI) reduction. In addition, after three cycles of testing, no obvious degradation is observed with the 3D heterostructured ZnIn₂S₄/SnS₂, which maintains a good photocatalytic stability.

Key words: ZnIn₂S₄/SnS₂ 3D heterostructure, Photocatalytic Cr(VI) reduction, Visible-light response, Charge separation, Photocatalytic stability

潘静文, 关中杰, 杨建军, 李秋叶. ZnIn₂S₄/SnS₂3D异质结的制备及其在可见光下高效还原Cr(VI)的应用[J]. 催化学报, 2020, 41(1): 200-208.

Jingwen Pan, Zhongjie Guan, Jianjun Yang, Qiuye Li. Facile fabrication of ZnIn₂S₄/SnS₂ 3D heterostructure for efficient visible-light photocatalytic reduction of Cr(VI)[J]. Chinese Journal of Catalysis, 2020, 41(1): 200-208.

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ZnIn₂S₄/SnS₂3D异质结的制备及其在可见光下高效还原Cr(VI)的应用

Facile fabrication of ZnIn₂S₄/SnS₂ 3D heterostructure for efficient visible-light photocatalytic reduction of Cr(VI)

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