摘要:
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。
Abstract:
Photocatalytic removal of formaldehyde under ultraviolet radiation has been studied using attapulgite base composite photocatalysts（ATP-SnO2-TiO2）,which were synthesized by an in situ sol-gel technique with a carrier of attapulgite.The composites were characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM） and other analytical techniques.The effects of preparing conditions on the physical characterization and the photoactivity were investigated,and photoability of different composite photocatalysts were also discussed in detail.Results showed the photoability of ATP was improved significantly by loading SnO2-TiO2,when the proportion of TiO2 was 50%,quality ratio of SnO2/ TiO2 was in 1∶4 and the sample was treated at 800 ℃,the photoability was larger.The degrationg rate on the formaldehyde of 30 mg/L can amount to 99% above after three hours,the composite photocatalyst showed excellent photocatalytic properties.
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