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以十六烷基三甲基溴化铵(CTAB)和氟化钠分别为碳源和氟源,采用溶胶-凝胶法制备了CF-TiO2光催化剂,并对其进行了SEM、XRD、N2吸附、XPS、UV-visDRS和PL表征。研究了CF-TiO2在模拟太阳光下光催化降解亚甲基蓝溶液的活性,并讨论了氟掺杂量以及CTAB加入量对催化性能的影响。结果表明,CF-TiO2为锐钛矿型,孔结构丰富、比表面积大,氟碳共掺后使TiO2光催化剂的禁带宽度变窄为2.40 eV,在可见光区吸收增强,有效提高TiO2在模拟太阳光下的光催化活性,而且当n(F/Ti)(氟钛摩尔比)为0.1,加入碳源CTAB量为2 g时,其光催化活性最好。
CF-TiO2 photocatalyst was prepared by sol-gel method using cetyltrimethylammonium bromide (CTAB) and sodium fluoride as carbon source and fluorine source respectively. SEM, XRD, N2 Adsorption, XPS, UV-visDRS and PL characterization. The activity of photocatalytic degradation of methylene blue solution of CF-TiO2 under simulated sunlight was studied. The effects of fluorine content and CTAB loading on the catalytic performance were also discussed. The results show that CF-TiO2 is anatase, rich in pore structure and large specific surface area. After CFD co-doping, the forbidden band width of TiO2 photocatalyst is narrowed to 2.40 eV and the absorption in the visible region is enhanced. The photocatalytic activity under sunlight was the best, and the best photocatalytic activity was obtained when the molar ratio of n (F / Ti) (fluorotitanium) was 0.1 and the amount of CTAB added as carbon source was 2 g.