title: The Visible-Light Photocatalytic Activity and Antibacterial Performance of Ag/AgBr/TiO2Immobilized on Activated Carbon.
abstract: Visible-light-driven Ag/AgBr/TiO2/activated carbon (AC) composite was prepared by solgel method coupled with photoreduction method. For comparison, TiO2, TiO2/AC, and Ag/AgBr/TiO2were also synthesized. Their characteristics were analyzed by XRD, SEM-EDS, TG-DSC and UV-vis techniques. Photocatalytic activity and antibacterial performance under visible-light irradiation were investigated by ICP-AES, ATR-FT-IR and spectrophotometry methods using methylene blue and Escherichia coli as target systems, respectively. The results showed that Ag/AgBr was successfully deposited on anatase TiO2/AC surface, and exhibited a distinct light absorption in the visible region. Ag/AgBr/TiO2/AC displayed excellent antibacterial performance both in dark and under visible-light illumination. The growth of E. coli cell was inhibited in the presence of Ag/AgBr/TiO2/AC in dark. Moreover, upon visible-light illumination, a significant damage of cell membrane was noticed. Ag/AgBr/TiO2/AC was also shown higher photocatalytic efficiency for methylene blue degradation than those of TiO2, TiO2/AC, and Ag/AgBr/TiO2. This is attributed to the synergetic effect between AC and Ag/AgBr/TiO2, of which AC acts as the role of increasing reaction areas, continuous enriching, and transferring the adsorbed MB molecules to the surface of supported photocatalysts, and the Ag/AgBr/TiO2acts as a highly active photocatalyst for degrading MB molecules under visible-light irradiation.
authors.affiliation: State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Yang
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan, China.
authors.forename: Fangyun
authors.initials: F
authors.lastname: Ye
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, China.
authors.forename: Fazhou
authors.initials: F
authors.lastname: Wang
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology*; D001965:Bromides / Q000737:chemistry / Q000494:pharmacology; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D004926:Escherichia coli / Q000187:drug effects*; D008027:Light; D008855:Microscopy, Electron, Scanning; D055668:Photochemical Processes; D012834:Silver / Q000737:chemistry / Q000494:pharmacology; D018030:Silver Compounds / Q000737:chemistry / Q000494:pharmacology; D017550:Spectroscopy, Fourier Transform Infrared; D014025:Titanium / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D001965:Bromides; D018030:Silver Compounds; C009495:titanium dioxide; D012834:Silver; D002244:Carbon; D014025:Titanium; C047751:silver bromide