TiO2-Cu2O/蒙脱土复合光催化剂的制备与性能

以钠基蒙脱土（MMT）为载体，先采用溶胶-凝胶法将纳米TiO₂引入到MMT层间，再采用化学沉积法将纳米Cu₂O负载在TiO₂/MMT上，制备出TiO₂-Cu₂O/MMT纳米复合光催化剂。采用XRD、SEM、紫外-可见漫反射技术对催化剂进行了表征。以甲基橙为目标污染物，考察了催化剂的光催化性能。表征结果显示：TiO₂与Cu₂O均匀分布在MMT的表面与片层孔隙中;TiO₂-Cu₂O/MMT结合了TiO₂和Cu₂O的特性，拓宽了催化剂的光吸收范围。实验结果表明，在光源为可见光、初始甲基橙质量浓度为20 mg/L、光催化剂加入量为2 g/L的条件下，TiO₂-Cu₂O/MMT纳米复合光催化剂对甲基橙的光催化降解效果明显优于单一负载的Cu₂O/MMT和TiO₂/MMT，大幅提高了催化剂的光催化效率，反应300 min时TiO₂-Cu₂O/MMT对甲基橙溶液的脱色率达到93%。

Preparation of TiO2-Cu2O/Montmorillonite Composite Photocatalyst and Its Photocatalytic Activity

Using montmorillonite（MMT） as carrier,nano-TiO₂ was introduced into the interlayer space of MMT by sol-gel method,and then nano-Cu₂O was loaded on the TiO₂/MMT by chemical deposition method. The prepared TiO₂-Cu₂O/MMT nano composite photocatalyst was characterized by XRD,SEM and UV-Vis DR,and its photoactivity was investigated by using methyl orange as target pollutant. The characterization results show that：TiO₂ and Cu₂O are distributed evenly on the surface and in the interlayer space of MMT;Since TiO₂-Cu₂O/MMT have the characteristics of TiO₂ and Cu₂O,the light abstraction width of the catalyst is widened. The experimental results show that：Under the conditions of visible light source,initial methyl orange mass concentration 20 mg/L and photocatalyst dosage 2 g/L,the photocatalytic degradation effect of methyl orange on the catalyst is signifcantly better than those on Cu₂O/MMT and TiO₂/MMT;When the reaction time is 300 min,the decolorization rate of the methyl orange solution is 93%.