摘要
采用溶胶-凝胶法,在磁性颗粒表面包覆TiO2,制备了易于固液分离的磁载光催化剂TiO2/SiO2/Fe3O4,通过XRD和TEM对产物的晶体结构、晶粒大小、形貌进行了表征,讨论了焙烧温度、焙烧时间、催化剂用量和光照时间等对TiO2光催化剂处理造纸废水的影响。结果表明:焙烧温度为500℃、焙烧时间3.5h时,光催化活性最高;催化剂用量为2.5g/L,光照时间4h时TiO2降解造纸废水的能力最强。
The photoactive TiO2 was deposited on the surface of magnetic particles using sol-gel coating technique to prepare a novel nanometer-sized magnetic photocatalyst TiO2/SiO2/Fe3O4, and were characterized by means of XRD and TEM, with analysis of effects of calcining temperature and time, catalyst amount as well as radiant time on papermaking wastewater degradation. Experimental results showed that calcinations at 500~C for 3.5h exhibited a higher photocatalytic activity, and at the optimal conditions as quantity of catalyst 2.5g/L （TiO2） and radiant time 4h, the removal efficiency of papermaking wastewater was over 80%.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2008年第1期87-89,共3页
Environmental Science & Technology
基金
桂林市科技攻关项目(20050105-3)
广西自然科学基金资助(06401900728229)
关键词
磁载
光催化剂
光催化活性
造纸废水
magnetic carriage, photocatalyst
photocatalytic activity
papermaking wastewater
