Ag2CO3/Bi2O2CO3光催化剂的p-n异质结构筑及活性研究

doi:10.7503/cjcu20190329

高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (12): 2590.doi: 10.7503/cjcu20190329

Ag₂CO₃/Bi₂O₂CO₃光催化剂的p-n异质结构筑及活性研究

王俊瑾¹,张国英^1,^2,^*(),孙亚秋¹,刘景旺^1,^*()

^1. 天津师范大学化学学院, 天津市功能分子结构与性能重点实验室,无机-有机杂化功能材料化学教育部重点实验室, 天津 300387
^2. 山东师范大学化学化工与材料科学学院, 山东省精细化学品清洁合成重点实验室, 山东 250014

收稿日期:2019-06-11 出版日期:2019-12-04 发布日期:2019-12-04
通讯作者: 张国英,刘景旺 E-mail:hxxyzgy@tjnu.edu.cn;hxxyljw@tjnu.edu.cn
基金资助:
山东省精细化学品清洁合成重点实验室开放基金(ZDSYS-KF201503)

Construction of Ag₂CO₃/Bi₂O₂CO₃ p-n Heterojunction and Its Photocatalytic Activity ^†

Junjin WANG¹,Guoying ZHANG^1,^2,^*(),Yaqiu SUN¹,Jingwang LIU^1,^*()

^1. College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry, Ministry of Education, Tianjin Normal University, Tianjin 300387, China
^2. College of Chemistry, Chemical Engineering and Materials Science, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Shandong Normal University, Shandong 250014, China

Received:2019-06-11 Online:2019-12-04 Published:2019-12-04
Contact: Guoying ZHANG,Jingwang LIU E-mail:hxxyzgy@tjnu.edu.cn;hxxyljw@tjnu.edu.cn
Supported by:
? Supported by the Open Foundation of Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, China(ZDSYS-KF201503)

摘要/Abstract

摘要：

采用先后沉淀法制备了Ag₂CO₃/Bi₂O₂CO₃(BOC)复合光催化剂. 扫描电子显微镜和透射电子显微镜表征结果表明, 尺寸为8.0~18.5 nm的Ag₂CO₃颗粒均匀分散于BOC纳米片表面. 两种半导体之间所形成的良好p-n异质界面效应拓宽了BOC的光吸收范围, 并有效促进了光生电子-空穴对的分离. Ag₂CO₃/BOC复合光催化剂的催化活性明显提高, 其中Ag₂CO₃含量(质量分数)为0.62%时活性最佳, 降解罗丹明B的速率常数为纯BOC的2.8倍. 结合催化过程中的活性物种研究和两种半导体的相对能带位置, 提出了p-n异质界面空间电荷层的形成以及载流子分离和迁移机制.

关键词: 碳酸氧铋, 碳酸银, p-n异质结, 光催化, 电荷迁移

Abstract:

Ag₂CO₃/Bi₂O₂CO₃(BOC) composite photocatalysts were prepared by a successive precipitation strategy. SEM and TEM results showed that Ag₂CO₃ nanoparticles were dispersively deposited on the surface of BOC nanosheets. A good p-n heterojunction structure was formed between the two semiconductors. The surface composite of Ag₂CO₃ effectively widened the light absorption of BOC and promoted the separation of photoinduced carriers. Accordingly, the photoactivity of Ag₂CO₃/BOC composite was greatly improved. In particular, the sample with Ag₂CO₃ content of 0.62% showed the best photocatalytic behavior with degradation rate improved by 1.8 times compared with that of BOC. Combining the detected oxidation species and the band positions of the semiconductors, the formation of space charge layer and the charge migration at the p-n heterojunction interface of Ag₂CO₃ and BOC were proposed.

Key words: Bi₂O₂CO₃, Ag₂CO₃, p-n Heterojunction, Photocatalysis, Charge migration

中图分类号:

O644
O643.3

TrendMD:

王俊瑾,张国英,孙亚秋,刘景旺. Ag₂CO₃/Bi₂O₂CO₃光催化剂的p-n异质结构筑及活性研究. 高等学校化学学报, 2019, 40(12): 2590.

Junjin WANG,Guoying ZHANG,Yaqiu SUN,Jingwang LIU. Construction of Ag₂CO₃/Bi₂O₂CO₃ p-n Heterojunction and Its Photocatalytic Activity ^†. Chem. J. Chinese Universities, 2019, 40(12): 2590.

图/表 11

Fig.1 XRD patterns of BOC and Ag2CO3/BOC samples

Fig.2 Survey(A) and high resolution Ag3d(B) XPS spectra for BOC and AB-0.62%

Fig.3 SEM images of BOC(A), AB-0.31%(B), AB-0.62%(C) and AB-1.24%(D)

Fig.4 TEM image(A), HRTEM image(B) and element mapping images(C—E) of AB-0.62% (C) Bi; (D) O; (E) Ag.

Fig.5 UV-Vis DRS(A) and PL(B) spectra of BOC, Ag2CO3 and of AB composites

Fig.6 Photocatalytic activity (A) and first-order kinetic plots for degradation of RhB by different samples(B)

Fig.7 Degradation process of RhB over BOC(A) and AB-0.62%(B) The inset in (B) is the photoactivity comparison of AB-0.62%(a) with samples prepared according to ref.[19](b) and ref.[20](c).

Fig.8 Comparison of photodegradation for different dyes of AB-0.62% after 40 min irradiation time(A) and cycle stability(B) of AB-0.62% fro degradation of RhB

Fig.9 Results of reactive species trapping experiments(A) and ESR spectra of radical adducts trapped by DMPO in AB-0.62% in methanol(B) and aqueous(C) dispersions

Fig.10 Photocurrent response(A) and Nyquist plots(B) of BOC and AB-0.62% composite

Fig.11 Schematic illustration of the charge separation and migration on the surface of AB-0.62%

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Ag₂CO₃/Bi₂O₂CO₃光催化剂的p-n异质结构筑及活性研究

Construction of Ag₂CO₃/Bi₂O₂CO₃ p-n Heterojunction and Its Photocatalytic Activity ^†

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