【摘要】 以钛酸四正丁酯为原料,活性白土为载体,采用溶胶法合成了稀土(Sm3+、Tm3+、Ho3+、Nd3+)掺杂TiO2-活性白土复合光催化剂,借助XRD和UV-Vis技术对其进行了表征,并以甲基橙为模型污染物考察了稀土元素种类及掺杂量对复合光催化剂光催化性能的影响规律。物相结构分析表明,稀土元素掺杂使得复合光催化剂中纳米TiO2晶粒细化;UV-Vis吸收光谱表明,稀土元素掺杂后复合光催化剂吸收边发生明显红移,且在紫外光和可见光区对光的吸收增强;光催化实验表明,四种稀土元素掺杂均能显著提高复合光催化剂的光催化性能,其中Tm3+和Sm3+掺杂改性效果较好,当Tm3+掺杂量为0.1%(物质的量百分比)时复合光催化剂光催化活性较高,将其用于卷烟厂蒸叶废水的脱色去味处理,效果较好,废水COD去除率达到79.1%,且催化剂易沉降分离、重复使用性能稳定。更多还原

【Abstract】 Rare earth-doped titania-activated bleaching clay composite photocatalyst was synthesized by sol method,and characterized by using XRD and UV-Vis techniques.Results of structural characterization indicate that RE3+ doping restrains the growth of TiO2 grain.UV-Vis absorption spectra reveal that Tm3+-doped TiO2-activated bleaching clay has stronger absorption band and the absorption edge is red-shifted comparing with TiO2-activated bleaching clay.Rare earth-doped TiO2-activated bleaching clay composite catalyst exhibits higher photocatalytic activity after rare earth(Sm3+、Tm3+、Ho3+、Nd3+)doping,especially Tm3+ doping and Sm3+ doping.In addition,photodegradation experiment of cigarette factory wastewater illustrates that Tm3+-doped TiO2-activated bleaching clay has high photocatalytic activity,COD removal of wastewater is 79.1% and composite catalyst can be easily recycled.更多还原