Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 605, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125373
Keywords
ZnO; Cu2O; BDCA; Controlling agent; Z-scheme; Photocatalytic activity
Categories
Funding
- National Natural Science Foundation of China [51762019, 41763020]
- Foundation of Jiangxi Educational Commission [GJJ180597, GJJ170664]
- Science Foundation of Jiangxi Science and Technology Normal University [2018XJYB002, YC2018-X03]
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High reaction activity, strong redox capability, stable Z-scheme transfer and good photostability may benefit the enhancement of photocatalytic performance of n-p heterojunction. Herein, novel 1,2-, 1,3- and 1,4-benzene dicarboxylic acids (1,2-BDCA, 1,3-BDCA and 1,4-BDCA) were used to tune carboxyl positions during the hydrothermal formation process of ZnO nanostructures, and then Z-scheme n-p heterojunctions were constructed via anchoring Cu2O nanoparticles on ZnO surface. When 1,2-BDCA molecule is added into reaction solution, the synergistic capping effect of its two - COOH groups on ZnO surface becomes strong, and leads to the formation of many ZnO nanosheets and well-contacted interface between ZnO and Cu2O. When four pollutants are photodegraded, ZnO-Cu2O (S1-Cu2O) heterojunction prepared by 1,2-BDCA possesses higher charge separation efficiency, stronger redox potentials, and stabler Z-scheme charge transfer. Due to these advantages, S1-Cu2O heterojunction exhibits higher reaction activity and better photocatalytic performance than those of ZnO, Cu2O, TiO2-P25 and/or commercial ZnO (CZnO) under irradiation of ultraviolet and visible light. In addition, the ZnOCu2O heterojunction exhibits excellent photostability and recyclability for photodegradation of pollutants. Therefore, this study reports a novel strategy to control the Z-scheme charge transfer, and the as-prepared ZnOCu2O photocatalysts provide a perspective for the application in environmental purification and remediation.
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