Journal
NEW JOURNAL OF CHEMISTRY
Volume 42, Issue 8, Pages 6134-6143Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nj04993e
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Funding
- National Science Foundation of China [21371084, 31570154]
- Major science and technology project of water pollution control and management in China [2015ZX07202-012]
- Key Laboratory Basic Research Foundation of Liaoning Provincial Education Department [L2015043]
- Liaoning Provincial Department of Education Innovation Team Projects [LT2015012]
- Youth Science Foundation of Liaoning University [2013LDQN14]
- Ministry of Public Security of People's Republic of China Technology Research Projects [2014JSYJA025]
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Here, an effective infrared-ultraviolet up-conversion luminescence agent (beta-Tm3+, Yb3+: NaYF4) is synthesized by a hydrothermal method and the corresponding photocatalyst (beta-Tm3+, Yb3+: NaYF4/MoS2-Ta2O5) is successfully prepared. The compositions and morphologies of the prepared beta-Tm3+, Yb3+: NaYF4, MoS2-Ta2O5 and beta-Tm3+, Yb3+: NaYF4/MoS2-Ta2O5 are all characterized by XRD, SEM, EDX, and FT-IR techniques. The photocatalytic activity of beta-Tm3+, Yb3+: NaYF4/MoS2-Ta2O5 is examined through the photocatalytic hydrogen evolution from an aqueous methanol solution under near-infrared light irradiation. In addition, the influence of factors such as the mass ratio of beta-Tm3+, Yb3+: NaYF4 and MoS2-Ta2O5, the heat-treatment temperature, and the initial pH value of the solution on the photocatalytic hydrogen evolution activity of beta-Tm3+, Yb3+: NaYF4/MoS2-Ta2O5 is also studied. The results show that the photocatalytic hydrogen evolution activity of Ta2O5 can be greatly enhanced by adding the up-conversion luminescence agent (beta-Tm3+, Yb3+: NaYF4) and co-catalyst (MoS2). Furthermore, the beta-Tm3+, Yb3+: NaYF4/MoS2-Ta2O5 catalyst with a 40 : 100 mass ratio which was heat-treated at 450 degrees C for 60 min in an aqueous methanol solution at initial pH = 6.0 displays the highest photocatalytic activity under near-infrared light irradiation.
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