Z型异质结In<sub>2</sub>O<sub>3</sub>/CdS的合成及光降解抗生素研究

doi:10.19965/j.cnki.iwt.2021-0209

工业水处理 ›› 2021, Vol. 41 ›› Issue (9): 92-97. doi: 10.19965/j.cnki.iwt.2021-0209

Z型异质结In₂O₃/CdS的合成及光降解抗生素研究

潘紫薇^1,²(),顾心童¹,张雪莹¹,盛铭军³,吴小敏³,黄继会⁴,王伟⁴,郭永福^1,*()

1. 苏州科技大学环境科学与工程学院, 江苏苏州 215009
2. 联创新锐设计顾问(武汉)有限公司, 湖北武汉 430014
3. 苏州市供排水管理处, 江苏苏州 215004
4. 苏州市排水有限公司, 江苏苏州 215021

收稿日期:2021-07-20 出版日期:2021-09-20 发布日期:2021-09-28
通讯作者: 郭永福 E-mail:1065909949@qq.com;yongfuguo@163.com
作者简介:潘紫薇(1996-), 硕士研究生, 助理工程师。电话: 18862324779, E-mail: 1065909949@qq.com
基金资助:
苏州市科技局民生科技项目(SS201802);江苏省大学生创新训练计划项目(201810332039Y)

Synthesis of Z-scheme heterojunction In₂O₃/CdS and its photocatalytic degradation of antibiotic

Ziwei Pan^1,²(),Xintong Gu¹,Xueying Zhang¹,Mingjun Sheng³,Xiaomin Wu³,Jihui Huang⁴,Wei Wang⁴,Yongfu Guo^1,*()

1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
2. United Design Group(Wuhan) Co., Ltd., Wuhan 430014, China
3. Suzhou Water Supply and Drainage Management Office, Suzhou 215004, China
4. Suzhou Drainage Co., Ltd., Suzhou 210021, China

Received:2021-07-20 Online:2021-09-20 Published:2021-09-28
Contact: Yongfu Guo E-mail:1065909949@qq.com;yongfuguo@163.com

摘要/Abstract

摘要：

为了拓展对可见光的吸收范围、抑制光生载流子的复合，并增强催化剂的光催化性能，通过将CdS原位生长于In₂O₃表面的方法制备出In₂O₃/CdS催化剂。结果表明：在可见光照射60 min后，In₂O₃/CdS异质结对盐酸强力霉素的去除效率达84.0%，远高于In₂O₃和CdS单体的降解效率，降解过程符合一级动力学。In₂O₃/CdS对盐酸强力霉素的降解速率常数为0.028 min^-1，分别为In₂O₃和CdS单体的13.7倍和1.5倍。自由基捕获实验表明：·O₂^-和·OH是主要的活性基团，光催化性能的提高主要得益于Z型异质结的形成，有效加速了光生电子和空穴的转移和分离效率。

关键词: In₂O₃/CdS, Z型异质结, 光催化, 抗生素

Abstract:

To expand the absorption range of visible light, inhibit the recombination of photogenerated carriers, and enhance the photocatalytic performance of the catalyst, In₂O₃/CdS was prepared by the in-situ deposition of CdS onto In₂O₃ surface. The results showed that the degradation efficiency of In₂O₃/CdS heterojunction toward doxycycline hydrochloride reached 84.0% under the irradiation of visible light for 60 min, which was far higher than those of In₂O₃ and CdS. And, the degradation process conformed to the first-order kinetics. The degradation rate constant of In₂O₃/CdS toward doxycycline hydrochloride was 0.028 min^-1, which was 13.7 and 1.5 times higher than those of In₂O₃ and CdS, respectively. In addition, free radical capture experiment showed that superoxide free radicals and hydroxyl free radicals were the main active species. The improvement of photocatalytic performance of In₂O₃/CdS was attributed to the formation of Z-scheme heterojunction, which accelerated the transfer and separation of photogenerated electrons and holes.

Key words: In₂O₃/CdS, Z-scheme heterojunction, photocatalytic, antibiotic

中图分类号:

潘紫薇,顾心童,张雪莹,盛铭军,吴小敏,黄继会,王伟,郭永福. Z型异质结In₂O₃/CdS的合成及光降解抗生素研究[J]. 工业水处理, 2021, 41(9): 92-97.

Ziwei Pan,Xintong Gu,Xueying Zhang,Mingjun Sheng,Xiaomin Wu,Jihui Huang,Wei Wang,Yongfu Guo. Synthesis of Z-scheme heterojunction In₂O₃/CdS and its photocatalytic degradation of antibiotic[J]. Industrial Water Treatment, 2021, 41(9): 92-97.

https://www.iwt.cn/CN/Y2021/V41/I9/92

图/表 10

图1 In₂O₃、CdS、In₂O₃/CdS的XRD

Fig.1 Spectra of XRD of In₂O₃, CdS and In₂O₃/CdS samples

图2 In₂O₃、CdS、In₂O₃/CdS的SEM
（a）In₂O₃；（b）CdS；（c）~（d）In₂O₃/CdS

Fig.2 SEM of In₂O₃, CdS and In₂O₃/CdS composites

图3 In₂O₃、CdS、In₂O₃/CdS的FT-IR

Fig.3 FT-IR of In₂O₃, CdS and In₂O₃/CdS samples

图4 In₂O₃/CdS的N₂吸附脱附曲线

Fig.4 N₂ adsorption and desorption isotherms of In₂O₃/CdS

图5 不同材料的UV-vis漫反射光谱图和带隙能谱图
（a）UV-vis漫反射光谱（b）带隙能谱图

Fig.5 Curves of UV-visible DRS and (αhν)² versus hν

图6 光降解DH的效率曲线和TOC去除率
（a）光降解DH的效率曲线（b）TOC去除率

Fig.6 Photodegradation efficiency and TOC removal rate of DH

图7 不同pH下In₂O₃/CdS光降解DH的效率曲线

Fig.7 In₂O₃/CdS photodegradation efficiency curve of DH under different pH

图8 DH的光降解动力学拟合曲线

Fig.8 Kinetic fitting results of photodegradation of DH

图9 不同材料对DH光反应的自由基捕获实验

Fig.9 Radical trapping experiment for photoreaction of DH

图10 In₂O₃/CdS异质结的光催化机理

Fig.10 Photocatalytic mechanism of the heterostructure In₂O₃/CdS under visible light

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Z型异质结In₂O₃/CdS的合成及光降解抗生素研究

Synthesis of Z-scheme heterojunction In₂O₃/CdS and its photocatalytic degradation of antibiotic