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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.
Using titanium tetrabutyl titanate as precursor and cetyltrimethyl ammonium bromide as pore former, one-step hydrothermal method and photoreduction were used to prepare silver plasma-based porous TiO2 photocatalyst. The results showed that the prepared Of the Ag @ Ag2S / porous TiO2 catalyst is anatase and has some of the brookite phases with a BET specific surface area of 243.9 m2 / g and an average pore diameter of 2.98 nm.Because of the silver surface plasmon effect, the catalyst light absorption edge red Ag 4 Ag 2 S was irradiated by xenon lamp (when the wavelength of filter was more than 400 nm), Ag @ Ag 2 S was increased to 475 nm, and its response in the visible range was significantly enhanced and photogenerated electron-hole pairs were easier to separate. / porous TiO 2 can degrade the decolorization rate of methyl orange to 98%, and the decolorization degradation rate of methyl orange solution can still be over 90% after the catalyst is reused 5 times, with stable photocatalytic activity. The antibacterial activity of the catalytic material was tested by using the bacteriostatic ring method with E. coli as the experimental strain. The results showed that the Ag @ Ag2S / porous TiO2 catalyst had good antibacterial activity and the diameter of the antibacterial ring reached 11 mm.