F-doped Ag/AgBr with enhanced visible-light photocatalytic activity and mechanism

被引：5
作者：
Bao, Ting [1 ,2 ]
Song, Limin [1 ,2 ]
Zhang, Shujuan [3 ]
机构：
[1] Tianjin Polytech Univ, Coll Environm & Chem Engn, Tianjin 300387, Peoples R China
[2] Tianjin Polytech Univ, State Key Lab Hollow Fiber Membrane Mat & Membran, Tianjin 300387, Peoples R China
[3] Tianjin Univ Sci & Technol, Coll Sci, Tianjin 300457, Peoples R China
来源：
APPLIED ORGANOMETALLIC CHEMISTRY | 2018年 / 32卷 / 06期
关键词：
enhancement mechanism; F-doped Ag; AgBr; photodegradation; AG-AT-AGCL; HIGHLY EFFICIENT; PLASMONIC PHOTOCATALYST; TIO2; PHOTODEGRADATION; DESTRUCTION; DEGRADATION; POLLUTANTS; BACTERIA; ACID;
D O I：
10.1002/aoc.4349
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
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 0.02MF(-) achieved the highest activity of 91% after 8min. ESR showed the main active species in methyl orange degradation was (OH)-O-center dot. The main enhancement mechanism is that F- inhibits the recombination of electron-hole pairs.
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页数：8
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