Ag/AgBr/WO(3).H(2)O: visible-light photocatalyst for bacteria destruction.
A new composite photocatalyst Ag/AgBr/WO(3).H(2)O was synthesized by reacting Ag(8)W(4)O(16) with HBr and then reducing some Ag(+) ions in the surface region of AgBr particles to Ag nanoparticles via the light-induced chemical reduction. Ag nanoparticles are formed from AgBr by the light-induced chemical reduction reaction. The Ag/AgBr particles are on the surface of WO(3).H(2)O and have irregular shapes with sizes varying between 63 and 442 nm. WO(3).H(2)O appears as flakes about 31 nm thick and 157-474 nm wide. The as-grown Ag/AgBr/WO(3).H(2)O sample shows strong absorption in the visible region because of the plasmon resonance of Ag nanoparticles in Ag/AgBr/WO(3).H(2)O. The ability of this compound to destroy E. coli and oxidize methylic orange under visible light was compared with those of other reference photocatalysts. Ag/AgBr/WO(3).H(2)O is a highly efficient photocatalyst under visible light. The Ag/AgBr/WO(3).H(2)O samples recovered from repeated photooxidation experiments are almost identical to the as-prepared samples, proving the stability of Ag/AgBr/WO(3).H(2)O sample.
State Key Lab of Crystal Materials, Shandong University, Jinan 250100, China.
Peng
P
Wang
Baibiao
B
Huang
Xiaoyan
X
Qin
Xiaoyang
X
Zhang
Ying
Y
Dai
Myung-Hwan
MH
Whangbo
D001391:Azo Compounds / Q000737:chemistry; D001965:Bromides / Q000737:chemistry*; D002384:Catalysis; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000187:drug effects / Q000378:metabolism*; D008027:Light; D008854:Microscopy, Electron; D010087:Oxides / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology; D055668:Photochemical Processes; D056951:Photoelectron Spectroscopy; D012834:Silver / Q000737:chemistry*; D018030:Silver Compounds / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014414:Tungsten / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology; D014867:Water / Q000737:chemistry*
D001391:Azo Compounds; D001965:Bromides; D010087:Oxides; D018030:Silver Compounds; D014867:Water; D012834:Silver; C100258:methyl orange; C511604:tungsten oxide; C047751:silver bromide; D014414:Tungsten