期刊
ARABIAN JOURNAL OF CHEMISTRY
卷 13, 期 2, 页码 3836-3848出版社
ELSEVIER
DOI: 10.1016/j.arabjc.2019.02.001
关键词
Photocatalysis; Cr(VI) reduction; Organic pollutant degradation; Synergistic effect; COD
资金
- National Natural Science Foundation of China [21476183, 21676213, 51372201]
- China Postdoctoral Science Foundation [2016M600809]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM2026]
- Scientific Research Foundation of the Education Department of Shaanxi Provincial Government, China [18JK0873]
The RP/g-C3N4 heterojunction photocatalyst was fabricated by a facile heat treatment strategy. The obtained composite has excellent light harvesting ability and charge separation performance. Compared to single RP and g-C3N4, the 50%-RP/g-C3N4 exhibited enhanced photocatalytic activity for simultaneously removing Cr(VI) and RhB, and the removal rates can reach 92% and 99% in 25 min, respectively. The enhanced mechanism was revealed by active species capturing experiments, showing that electrons can reduce Cr(VI) and produce O-center dot(2) in air and that holes can directly oxidize the dyes. The coexistence of Cr(VI) and RhB will lead to a synergistic improvement of Cr(VI) reduction and RhB degradation due to rapid surface reactions. This further improves the charge separation except for the heterojunction effect. In addition, the COD analysis demonstrates that organic dyes are mainly degraded into CO2, H2O and some intermediates. (C) 2019 Production and hosting by Elsevier B.V. on behalf of King Saud University.
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