In Situ Synthesis of All-Solid-State Z-Scheme BiOBr0.3I0.7/Ag/AgI Photocatalysts with Enhanced Photocatalytic Activity Under Visible Light Irradiation

Junlin Lu; Chaoqun Shang; Qingguo Meng; Haiqin Lv; Zhihong Chen; Hua Liao; Ming Li; Yongguang Zhang; Mingliang Jin; Mingzhe Yuan; Xin Wang; Guofu Zhou

doi:10.1186/s11671-018-2778-9

In Situ Synthesis of All-Solid-State Z-Scheme BiOBr_0.3I_0.7/Ag/AgI Photocatalysts with Enhanced Photocatalytic Activity Under Visible Light Irradiation

Nanoscale Res Lett. 2018 Nov 20;13(1):368. doi: 10.1186/s11671-018-2778-9.

Authors

Junlin Lu¹, Chaoqun Shang¹, Qingguo Meng², Haiqin Lv², Zhihong Chen^{3

4}, Hua Liao⁵, Ming Li⁵, Yongguang Zhang⁶, Mingliang Jin^{1

6}, Mingzhe Yuan², Xin Wang^{7

8}, Guofu Zhou^{1

6}

Affiliations

¹ South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, Guangdong, Province, China.
² Shenyang Institute of Automation, Chinese Academy of Sciences, Guangzhou, 511458, China.
³ Shenyang Institute of Automation, Chinese Academy of Sciences, Guangzhou, 511458, China. chenzhihong1227@sina.com.
⁴ International Academy of Optoelectronics, South China Normal University, Zhaoqing, Guangdong Province, China. chenzhihong1227@sina.com.
⁵ Institute of Solar Energy, Yunnan Normal University, Kunming, 650500, People's Republic of China.
⁶ International Academy of Optoelectronics, South China Normal University, Zhaoqing, Guangdong Province, China.
⁷ South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, Guangdong, Province, China. wangxin@scnu.edu.cn.
⁸ International Academy of Optoelectronics, South China Normal University, Zhaoqing, Guangdong Province, China. wangxin@scnu.edu.cn.

Abstract

A series of novel visible light driven all-solid-state Z-scheme BiOBr_0.3I_0.7/Ag/AgI photocatalysts were synthesized by facile in situ precipitation and photo-reduction methods. Under visible light irradiation, the BiOBr_0.3I_0.7/Ag/AgI samples exhibited enhanced photocatalytic activity compared to BiOBr_0.3I_0.7 and AgI in the degradation of methyl orange (MO). The optimal ratio of added elemental Ag was 15%, which degraded 89% of MO within 20 min. The enhanced photocatalytic activity of BiOBr_0.3I_0.7/Ag/AgI can be ascribed to the efficient separation of photo-generated electron-hole pairs through a Z-scheme charge-carrier migration pathway, in which Ag nanoparticles act as electron mediators. The mechanism study indicated that ·O₂^- and h⁺ are active radicals for photocatalytic degradation and that a small amount of ·OH also participates in the photocatalytic degradation process.

Keywords: BiOBr0.3I0.7/Ag/AgI; Photocatalytic; Z-scheme.

Abstract

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