Simultaneous degradation of RhB and reduction of Cr(VI) by MIL-53(Fe)/Polyaniline (PANI) with the mediation of organic acid

doi:10.1016/j.cjche.2021.08.008

中国化学工程学报 ›› 2022, Vol. 42 ›› Issue (2): 55-63.DOI: 10.1016/j.cjche.2021.08.008

• Recent Advances in Adsorptive Separation Materials and Technologies • 上一篇下一篇

Simultaneous degradation of RhB and reduction of Cr(VI) by MIL-53(Fe)/Polyaniline (PANI) with the mediation of organic acid

Wanyuan Wang¹, Chengxin Wen¹, Daoyuan Zheng², Chunhu Li¹, Junjie Bian¹, Xinbo Wang²

1. Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China;
2. School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China

收稿日期:2021-03-27 修回日期:2021-06-29 出版日期:2022-02-28 发布日期:2022-03-30
通讯作者: Junjie Bian,E-mail:junjiebian@ouc.edu.cn;Xinbo Wang,E-mail:wangxb@sdu.edu.cn
基金资助:
The authors thank the financial support from the National Natural Science Foundation of China (Nos. 21908018 and 22078174), Key Technology Research and Development Program of Shandong (No. 2017GSF217008), and QiLu Young Scholar Start-up Foundation of Shandong University.

Simultaneous degradation of RhB and reduction of Cr(VI) by MIL-53(Fe)/Polyaniline (PANI) with the mediation of organic acid

Wanyuan Wang¹, Chengxin Wen¹, Daoyuan Zheng², Chunhu Li¹, Junjie Bian¹, Xinbo Wang²

1. Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, Ocean University of China, Qingdao 266100, China;
2. School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China

Received:2021-03-27 Revised:2021-06-29 Online:2022-02-28 Published:2022-03-30
Contact: Junjie Bian,E-mail:junjiebian@ouc.edu.cn;Xinbo Wang,E-mail:wangxb@sdu.edu.cn
Supported by:
The authors thank the financial support from the National Natural Science Foundation of China (Nos. 21908018 and 22078174), Key Technology Research and Development Program of Shandong (No. 2017GSF217008), and QiLu Young Scholar Start-up Foundation of Shandong University.

摘要/Abstract

摘要： MIL-53(Fe)/polyaniline (PANI) composite was prepared by in situ depositing PANI on the surface of MIL-53(Fe) and their catalytic performances on the simultaneous removal of RhB and Cr(VI) were investigated. The elimination efficiency of both RhB and Cr(VI) reached more than 98% under pH=2 where hydrochloric acid and citric acid were used to adjust the pH. The results indicated that MIL-53(Fe)/PANI revealed an obvious pH response to the degradation of RhB, while citric acid promoted the Cr(VI) photoreduction. UV-Vis spectra, EIS, and photocurrent response experiments showed that MIL-53(Fe)/PANI had a better light response and carrier migration ability than MIL-53(Fe). The transient absorption spectra also exhibited that the lifetimes of photo-generated carriers were prolonged after the conductive polymer deposition on the MIL-53(Fe) surface. Scavenger experiments demonstrated that the main active species were ·O₂^- and OH. Combined with activity evaluation results, and the possible photocatalytic mechanism of MIL-53(Fe)/PANI on RhB oxidation and Cr(VI) reduction was proposed. The addition of conductive polymer can effectively improve the light response of the catalyst under acidic conditions, and meanwhile citric acid also provided a new mediation for the synergistic degradation of multiple pollutants. Good activity and stability of the catalysts made the scale-up purification of acid water feasible under UV-Vis light.

关键词: Photocatalyst, MIL-53(Fe), Polyaniline, Synergistic effects, Cr(VI)-RhB coexistence system

Abstract: MIL-53(Fe)/polyaniline (PANI) composite was prepared by in situ depositing PANI on the surface of MIL-53(Fe) and their catalytic performances on the simultaneous removal of RhB and Cr(VI) were investigated. The elimination efficiency of both RhB and Cr(VI) reached more than 98% under pH=2 where hydrochloric acid and citric acid were used to adjust the pH. The results indicated that MIL-53(Fe)/PANI revealed an obvious pH response to the degradation of RhB, while citric acid promoted the Cr(VI) photoreduction. UV-Vis spectra, EIS, and photocurrent response experiments showed that MIL-53(Fe)/PANI had a better light response and carrier migration ability than MIL-53(Fe). The transient absorption spectra also exhibited that the lifetimes of photo-generated carriers were prolonged after the conductive polymer deposition on the MIL-53(Fe) surface. Scavenger experiments demonstrated that the main active species were ·O₂^- and OH. Combined with activity evaluation results, and the possible photocatalytic mechanism of MIL-53(Fe)/PANI on RhB oxidation and Cr(VI) reduction was proposed. The addition of conductive polymer can effectively improve the light response of the catalyst under acidic conditions, and meanwhile citric acid also provided a new mediation for the synergistic degradation of multiple pollutants. Good activity and stability of the catalysts made the scale-up purification of acid water feasible under UV-Vis light.

Key words: Photocatalyst, MIL-53(Fe), Polyaniline, Synergistic effects, Cr(VI)-RhB coexistence system

Wanyuan Wang, Chengxin Wen, Daoyuan Zheng, Chunhu Li, Junjie Bian, Xinbo Wang. Simultaneous degradation of RhB and reduction of Cr(VI) by MIL-53(Fe)/Polyaniline (PANI) with the mediation of organic acid[J]. 中国化学工程学报, 2022, 42(2): 55-63.

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Simultaneous degradation of RhB and reduction of Cr(VI) by MIL-53(Fe)/Polyaniline (PANI) with the mediation of organic acid

Simultaneous degradation of RhB and reduction of Cr(VI) by MIL-53(Fe)/Polyaniline (PANI) with the mediation of organic acid

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