Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 1, Pages 48-56Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.06.102
Keywords
Nanoparticles; Compound photocatalyst
Categories
Funding
- Key Project of Applied Basic Research of Sichuan Science and Technology Department [2017JY0349]
- Southern Medical University academic innovation team construction plan [2020NTD01]
- National Research Foundation
- AcRF, Singapore [Rp6/16 Xs]
- Science and Engineering Faculty, Queensland University of Technology, Brisbane, Australia
- Australian Research Council
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The synergistic effects of Cu and Ag in a ZnO-based catalytic platform can significantly enhance the photocatalytic activity of Ag/ZnO. Incorporation of a small amount of Cu can greatly improve the performance of Ag/ZnO heterostructure, leading to enhanced visible light absorption capacity and prolonged photo-excited charge lifetime. Excessive introduction of Cu precursors, however, may inhibit the interfacial charge transfer between Ag and ZnO NPs under UV and visible light irradiation.
By carefully balancing synergies and antagonisms that arise from incorporating Cu and Ag within a single ZnO-based catalytic platform, the photocatalytic activity of Ag/ZnO based on three-dimensional modified ceramic structures can be further significantly enhanced. The performance of Ag/ZnO heterostructure (Z0) was significantly improved by only 0.2 mol% Cu incorporation (Z0.2) and the first-order degradation kinetics constants (K) of Z0.2 were 2 and 1.5 times higher than that of Z0 under simulated sunlight and UV light. The synergies between Cu dopants and metallic Ag were mainly the significantly enhanced visible light absorption capacity and the prolonged photo-excited charge lifetime. However, with the excessive introduction of Cu precursors, the surface Cu2+ was found to inhibit the interfacial charge transfer between Ag and ZnO NPs under UV and visible light irradiation, but the transformation from Cu2+ to Cu+ was also presumed to be a driving factor for the improvement of photocatalytic efficiency. These interactions may provide a useful pathway for enhancing photocatalytic efficiency of low-cost ZnO-based catalytic platforms.
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