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以凹凸棒黏土(ATP)为基体,通过原位溶胶-凝胶工艺,制备出凹土基复合光催化剂(ATP-SnO2-TiO2)光催化甲醛。采用X射线衍射(XRD),透射电镜(TEM)等分析测试技术对复合体进行表征。考察制备条件对其物理结构和光催化性能的影响,并对不同光催化剂性能进行研究。结果表明,在凹凸棒黏土表面负载SnO2-TiO2后光催化性能得到明显提高,复合体中TiO2负载量为50%(质量比)、SnO2与TiO2质量比为1∶4、800℃煅烧的复合光催化剂活性最强,光照射3 h后对30 mg/L的甲醛溶液的降解率可达99%以上,显示出优异的光催化性能。
The photocatalytic formaldehyde was prepared from the attapulgite clay (ATP) matrix by in-situ sol-gel process. The composite was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The influence of preparation conditions on the physical structure and photocatalytic performance was investigated, and the different photocatalytic properties were studied. The results showed that the photocatalytic activity of attapulgite clay loaded with SnO2-TiO2 was obviously improved. The photocatalytic activity of the attapulgite clay loaded with TiO2 was 50% (mass ratio) and the mass ratio of SnO2 to TiO2 was 1: 4,800 ℃ The strongest photocatalytic activity was obtained after 3 h of light irradiation. The degradation rate of formaldehyde solution of 30 mg / L was above 99% after 3 h of light irradiation, which showed excellent photocatalytic activity.