CAJ | 학술논문

为提高光催化剂的稳定性,选取硅藻土为载体,以钛酸四异丙酯为前驱物,采用溶胶一凝胶法制备了TiO_2/硅藻土光催化剂,并利用XRD、SEM、FT-IR等技术对其进行表征.以蒽醌染料弱酸性艳蓝RAW为目标降解物,考察了TiO_2/硅藻土的光催化活性、最佳pH值范围及催化剂重复使用对光催化活性的影响.结果表明,所制备的TiO_2为锐钛矿和金红石混晶型,平均粒径11nm,通过控制硅藻土加入量可以得到负载均匀的光催化剂所制备的TiO_2/硅藻土具有较强的光催化活性,对弱酸性艳蓝RAW的降解效果好于商品Degussa P25型TiO_2,最佳pH值为4.0.该催化剂性质稳定,重复使用15次后,催化活性仅降低12.4%.
위제고광최화제적은정성,선취규조토위재체,이태산사이병지위전구물,채용용효일응효법제비료TiO_2/규조토광최화제,병이용XRD、SEM、FT-IR등기술대기진행표정.이은곤염료약산성염람RAW위목표강해물,고찰료TiO_2/규조토적광최화활성、최가pH치범위급최화제중복사용대광최화활성적영향.결과표명,소제비적TiO_2위예태광화금홍석혼정형,평균립경11nm,통과공제규조토가입량가이득도부재균균적광최화제소제비적TiO_2/규조토구유교강적광최화활성,대약산성염람RAW적강해효과호우상품Degussa P25형TiO_2,최가pH치위4.0.해최화제성질은정,중복사용15차후,최화활성부강저12.4%.
In order to improve the stability of photocatalyst, TiO_2/diatomite was prepared by sol-gel method with titanium (IV) isopropoxide as precursor, which was then characterized by XRD, SEM and FT-IR. The photocatalytic activity of the composite was determined using anthraquinone dye weak acid brilliant blue RAW as model pollutant. Influences of solution pH and the photocatalyst-reused on photocatalytic activity were also investigated. TiO_2 coated on the surface of diatomite showed mixed crystal of anatase and rutile with an average particle size of 11 nm. The uniform TiO_2 coating could be achieved by controlling the amount of added diatomite. The TiO_2/diatomite demonstrated strong photocatalytic activity, and the decolorizing rate for weak acid brilliant blue RAW solution was higher than that for the Degussa P25-TiO_2. The optimum pH for photocatalytic reaction was 4.0. The TiCVdiatomite also showed strong stability, with its photocatalytic activity reducing only 12.4% after repeated use for 15 times.