一步法制备银-硫化银负载多孔TiO_2及其光催化和抗菌性能  

One-pot Hydrothermal Synthesis of Ag@ Ag_2S modified porous TiO_2 and Its Photocalytic and Antimicrobial Properties

作　　者：朱力校[1] 赵志换[1] 岳学勇[1] 范济民[1] 

机构地区：[1]太原理工大学化学化工学院,山西太原030024

出　　处：《分子催化》2013年第5期467-473,共7页Journal of Molecular Catalysis(China)

基　　金：山西省自然科学基金青年基金(批准号2008021015)

摘　　要：以钛酸丁酯为前驱体,溴化十六烷基三甲胺为制孔剂,采用一步水热法并结合光还原处理制备出银等离子基元负载多孔TiO2光催化剂.结果表明,所制得的Ag@Ag2S/porous TiO2催化剂为锐钛矿相,并有部分板钛矿相,其BET比表面积达243.9 m2/g,平均孔径为2.98 nm.由于银基表面等离子效应,催化剂光吸收边际红移到475nm处,其在可见光范围的响应明显增强,光生电子-空穴对更容易分离,因而催化剂活性明显增强.在氙灯(加滤光片使波长大于400 nm)照射下90 min Ag@Ag2S/porous TiO2可以使甲基橙脱色降解率达到98%.并且此催化剂在重复利用5次后,对甲基橙溶液的脱色降解率仍能保持在90%以上,具有稳定的光催化活性.采用抑菌环法,以大肠杆菌为实验菌种,对催化材料的抗菌性能进行了测试,结果表明,所制得的催化剂Ag@Ag2S/porous TiO2具有较好的抑菌效果,抑菌圈直径达到11 mm.The photocatalyst of Ag@ Ag2 S/porous TiO2 was synthesized by one-pot hydrothermal synthesis method with Ti（OBu） 4 as forerunner and cetyl trimethyl ammonium bromide（ CTAB ）as a template. The results showed that the synthesized photocatalyst of Ag@ Ag2S/porousTiO2 was mainly anatase with a small part of brookite phase. Its BET specific surface area was 243.9 m2/g and the average pore diameter was 2.98 nm. With surface plasmon reso- nance, the photo-absorption bound had a red-shift about to 475 nm,which significantly enhanced the response of the visible range and the photoinduced electron-hole pairs separated easily. The photocatalysis-reaction of methyl orange was used to vertify the reaction activity of as synthesized photocatalysts, with the xenon lamp （the wavelength be- yond 400 nm） continuous irradiating for 90 rain, the degradation rate of the methyl orange solution reached 98%. Moreover, after five times reusing, the degradation rate of methyl orange remained over 90%, which can be explained the as synthesized photocatalysts had stable photocatalytic activity. The antibacterial performance test suggested that the photocatalyst also showed good antibacterial function.

关 键 词：一步法 银-硫化银 等离子共振效应 多孔TiO2 抑菌 

分 类 号：O643.32[理学—物理化学]