Smart Removal of Dye Pollutants via Dark Adsorption and Light Desorption at Recyclable Bi2O2CO3 Nanosheets Interface

被引：28

作者：

Liu, Haijin ^{[1
,2
]}

Chen, Min ^{[1
]}

Wei, Dandan ^{[1
,3
]}

Ma, Yaqiang ^{[1
]}

Wang, Fengliang ^{[3
]}

Zhang, Qianxin ^{[3
]}

Shi, Jialu ^{[1
]}

Zhang, Hui ^{[1
]}

Peng, Jianbiao ^{[1
]}

Liu, Guoguang ^{[3
]}

Zhang, Shanqing ^{[2
]}

机构：

[1] Henan Normal Univ, Key Lab Yellow River & Huaihe River Water Environ, Henan Key Lab Environm Pollut Control,Sch Environ, Minist Educ,Int Joint Lab Key Tech Water Treatmen, Xinxiang 453007, Henan, Peoples R China

[2] Griffith Univ, Ctr Clean Environm & Energy, Sch Environm & Sci, Gold Coast Campus, Nathan, Qld 4222, Australia

[3] Guangdong Univ Technol, Fac Environm Sci & Engn, Guangzhou 510006, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2020年 / 12卷 / 18期

基金：

中国国家自然科学基金;

关键词：

nanosheets; Bi2O2CO3; adsorption; light desorption; photo-induced; dyes; CITRIC-ACID; PHOTOCATALYTIC ACTIVITY; FACILE SYNTHESIS; OXYGEN VACANCY; 001; FACETS; CARBON; EFFICIENT; DEGRADATION; DOTS; MICROSPHERES;

D O I：

10.1021/acsami.0c02848

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The adsorbents for water treatment and purification are commonly not recyclable because of the lack of a reagent-less "switch" to readily release the adsorbed compounds. Herein, the interface of Bi2O2CO3 (BOG) nanosheets is designed, synthesized, and modified with citric acid, namely, modified Bi2O2CO3 (m-BOC). The m-BOC is able to selectively adsorb methylene blue (MB) in the dark and the adsorbed MB could be released in the light from m-BOC without the addition of any chemicals. The adsorption mechanism is attributed to the electrostatic attraction between positively charged MB and the negatively charged surface of m-BOC. In contrast, the desorption of MB has resulted from the photo-induced charge redistribution on the surface of m-BOC, which unlocks the coordination bond between m-BOC and the carboxylic group. As a result, BOC is recycled. Such a mechanism was verified by both experimental investigation and DFT calculation. This work provides a promising interfacial engineering strategy for the remediation of dye-polluted water and smart separation in chemical engineering.

引用

页码：20490 / 20499

页数：10

共 45 条

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