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°C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。

关键词: 溶胶-凝胶, γ-Al₂O₃, 纳米TiO₂, 光催化

Abstract: Photocatalyst was prepared by loading of the active catalyst carrier y-Al₂O₃ or 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 y-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,, 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 y-Al₂O₃, was loaded, the anatase 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.

Key words: sol-gel, y-Al₂O₃, nano-TiO₂, photocatalysis