表面等离子体共振效应增强Ag/Bi2WO6光催化降解氟伐他汀性能OA

As the photocatalyst is excitable by visible light,the low photocatalytic efficiency of bismuth tungstate(Bi2WO6)was confirmed due to the recombination of photogenerated electron-hole pair.The Ag/Bi2WO6composite photocatalyst was prepared using a simple photoreduction method.The morphological structure,crystal structure,optical properties,photoelectric proper-ties,and photocatalytic performance of the composite catalysts with different Ag loading amounts were investigated.The results showed that an absorption peak at 500 nm was observed in the UV-Vis diffuse reflectance spectra of the Ag/Bi2WO6 composite photocatalyst caused by the plasmon resonance effect through Ag loading,which increased the number of photogenerated electron-hole pairs during photocatalytic process.Meanwhile,the Schottky barrier of the interface between Ag and Bi2WO6 promoted the transfer of photogenerated electrons from Bi2WO6 to Ag.Ag an elec-tron acceptor,effectively enhanced the spearation efficiency of photogenerated electron-hole pairs,resulting in a marked increase in photocurrent response and a decrease in electrochemical imped-ance.Under the combined effects of the increased number of photogenerated electron-hole pairs and enhanced separation efficiency,the photocatalytic performance of the Ag/Bi2WO6 composite photocatalyst was significantly improved.When the loading of 1%of Ag,the Ag/Bi2WO6 com-posite photocatalyst exhibited excellent performance.The removal rate of fluvastatin reached 83.59%,representing a 13.75%increase compared to pure Bi2WO6.