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以TiCl4为钛源,NaOH为沉淀剂,采用水解―沉淀法制备出云母负载纳米TiO2光催化剂(TiO2/M),采用TG,XRD,SEM,UV等手段对所制备的粉体进行了性能表征;并以日光色镝灯为光源,研究了催化剂对甲基橙的光降解活性。讨论了材料制备过程中焙烧温度、光催化剂添加量、重复次数对光降解甲基橙活性的影响。结果表明:纳米TiO2物相为锐钛矿相和金红石相混晶,平均晶粒尺寸为10～30 nm,颗粒在云母表面形成均匀牢固的包覆层,制备的云母负载纳米TiO2光催化剂对200～370nm的紫外光有较高的吸收率。经400℃焙烧2 h制备的光催化剂以5 g/L加入时,60 min对甲基橙的降解率达到80%;相同条件下重复利用3次,60 min对甲基橙的降解率仍然可高达49%。
TiO2 / M was prepared by hydrolysis-precipitation method using TiCl4 as titanium source and NaOH as precipitator. The prepared powders were characterized by means of TG, XRD, SEM and UV The photodegradation activity of methyl orange on the catalyst was studied by using daylight dysprosium lamp as light source. The effects of calcination temperature, photocatalyst dosage and repetition times on the photodegradation of methyl orange were discussed. The results show that the nano-TiO2 phase is anatase phase and rutile phase mixed crystal, the average grain size is 10-30 nm, and the particles form a uniform and firm coating on the mica surface. The prepared mica-loaded nano-TiO2 photocatalyst has a good effect on 200 ~ 370nm UV light has a higher absorption rate. When the photocatalyst prepared by calcination at 400 ℃ for 2 h was added at 5 g / L, the degradation rate of methyl orange reached 80% at 60 min; under the same conditions, the degradation rate of methyl orange could still be Up to 49%.