F‐doped Ag/AgBr with enhanced visible‐light photocatalytic activity and mechanism |
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| Authors: | Ting Bao Limin Song Shujuan Zhang |
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| Affiliation: | 1. College of Environment and Chemical Engineering and State Key Laboratory of Hollow‐Fiber Membrane Materials and Membrane Processes, Tianjin Polytechnic University, Tianjin, People's Republic of China;2. College of Science, Tianjin University of Science and Technology, Tianjin, People's Republic of China |
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| Abstract: | Novel F‐doped Ag/AgBr photocatalysts containing various amounts of F? were synthesized by an ion exchange method. The photocatalysts were characterized using X‐ray diffraction (XRD), scanning and transmission electron microscopies, X‐ray photoelectron, ultraviolet–visible absorption and photoluminescence spectroscopies and electron spin resonance (ESR). Powder XRD revealed that F? was inserted into the crystal lattices of AgBr and partially replaced Br?, resulting in the contraction of the AgBr lattices. Methyl orange photodegradation experiments showed that the photocatalytic activity of F‐doped Ag/AgBr was significantly dependent on the amount of F?. Ag/AgBr doped with 0.02 M F? achieved the highest activity of 91% after 8 min. ESR showed the main active species in methyl orange degradation was ?OH. The main enhancement mechanism is that F? inhibits the recombination of electron–hole pairs. |
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| Keywords: | enhancement mechanism F‐doped Ag/AgBr photodegradation |
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