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分别采用均匀水解-热分解法和化学沉淀法一步合成含银1%的纳米TiO2粉体,用XRD、TEM、UV-vis等技术对所得粉体的组成、表面形貌和光吸收性质分别进行了表征;并以15W紫外灯为光源,5-磺基水杨酸为目标降解物,评价了光催化剂的催化活性。结果表明:所得粉体粒径为8～21nm;化学沉淀法制得的样品主要为锐钛矿,均匀水解-热分解法制得样品中,除了氨水作分散剂制得的样品主要为锐钛矿外,其余样品均为锐钛矿和金红石型混合晶体;载银后的TiO2对光的吸收发生红移,吸收强度明显增大。以PEG4000为分散剂,采用化学沉淀法制得的TiO2表现出最佳的光催化活性,60min内对5-磺基水杨酸溶液的降解率达到34.7%。
The nano-TiO2 powder containing 1% silver was synthesized by homogeneous hydrolysis-thermal decomposition and chemical precipitation respectively. The composition, surface morphology and optical absorption properties of the powders were characterized by XRD, TEM and UV-vis respectively Characterization; and 15W UV lamp as a light source, 5 - sulfosalicylic acid as the target degradation products, evaluate the catalytic activity of the photocatalyst. The results show that the particle size of the obtained powder is 8 ~ 21nm. The samples prepared by chemical precipitation method are mainly anatase. The samples prepared by uniform hydrolysis - thermal decomposition are mainly anatase , The rest of the samples are anatase and rutile mixed crystals; after silver-loaded TiO2 light absorption red shift, the absorption intensity increased significantly. With PEG4000 as dispersant, TiO2 prepared by chemical precipitation showed the best photocatalytic activity, and the degradation rate of 5-sulfosalicylic acid solution was 34.7% within 60min.