摘要
采用活性催化剂载体γ-Al2O3负载二氧化钛制备光催化剂。采用溶胶-凝胶法得到负载型的TiO2,在450℃下煅烧得到最终样品。研究了不同γ-Al2O3负载量的光催化剂对甲基橙的降解效果,并对其进行了FT-IR、XRD、EDS、TG、SEM、FESEM等表征。结果表明:煅烧后的样品TiO2表面负载有γ-Al2O3,TiO2晶相主要以锐钛矿相和金红石相存在,随着γ-Al2O3负载量的提高,金红石的比例越来越少,主要以锐钛矿相存在,但γ-Al2O3负载量过高时,锐钛矿相特征趋于消失。通过对比不同负载比例的光催化剂降解效果,得出最佳催化效果的γ-Al2O3负载量为20%～25%,过高地负载γ-Al2O3会对紫外光线产生遮挡作用,影响光降解率。
Photocatalyst was prepared by loading of the active catalyst carrier γ-Al2O3 on TiO2. The load type titanium dioxide was prepared by sol -gel method, which was calcined under high temperature of 450 ℃ to form the final product. The effect of different loading of γ-Al2O3 carrier on degradation of methyl orange was studied, which was characterized by FT- IR, XRD, EDS, TG, SEM and FESEM. The results showed that the calcined samples of titanium dioxide was loaded with y -A1203, and the crystal phase of TiO2 was almost in the form of anatase and rutile phase and with the nano - alumina loading increased, the ratio of rutile phase decreased, anatase phase increased. But when excessive γ-Al2O3 was loaded, the ana- tase phase characteristics disappeared. Comparison of the different load ratio photocatalyst, it was found that the best load ratio was about 20% - 25%, the excessive alumina would block UV light and influence the photodegradation rate.
出处
《涂料工业》
CAS
CSCD
北大核心
2013年第1期56-58,62,共4页
Paint & Coatings Industry
