摘要
将纳米TiO_2通过采用物理研磨法、水分散混合法、溶剂凝胶法对硅藻土其进行改性,并研究了对甲醛的去除性能.结果表明,三种改性方法对硅藻土去除甲醛的能力均有明显提高,溶胶凝胶法改性后的硅藻土去除率最高,可达63.90%.XRD分析表明,改性后的硅藻土均含有TiO_2锐钛矿晶型,其中经溶胶凝胶法改性后硅藻土所含TiO_2锐钛矿晶型最好.红外光谱分析结果表明,三种改性硅藻土在吸附甲醛后均无醛基特征峰出现,可说明改性硅藻土可在可见光下有效催化降解甲醛,而非将其吸附.
Diatomite was modified by nano -TiO2 using grinding, water dispersive mixing or sol- gel method and the capability of formaldehyde removal was investigated. The results showed that the diatomite modified by all the 3 modified methods could remove formaldehyde effectively, and diatomite modified by sol - gal had better capability for formaldehyde degra- dation and the removal rate could reach 61.38%. XRD analysis indicated that anatase crystal was presented in the three modified diatomite, and it was more obvious in sol - gel modified diatomite. Infrared spectroscopic analysis indicated that no aldehyde group appeared in modified diatomite after formaldehyde adsorption, which proved that formaldehyde was degraded through visible -light photo -eatalyse reactions other than been adsorbed.
出处
《哈尔滨商业大学学报（自然科学版）》
CAS
2016年第3期353-356,共4页
Journal of Harbin University of Commerce：Natural Sciences Edition
关键词
硅藻土
纳米TIO2
光催化
甲醛降解
diatomite
formaldehyde degradation
nano - TiO2
photocatalysis
