期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 18, 页码 20490-20499出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c02848
关键词
nanosheets; Bi2O2CO3; adsorption; light desorption; photo-induced; dyes
资金
- National Natural Science Foundation of China [21677040, 21377031]
- Natural Science Foundation of Henan Province [182300410121]
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.
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