摘要
以活性炭为载体,采用溶胶凝胶法制备了负载型的催化剂(TiO2/GAC)。利用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等方法对催化剂进行了表征。通过有无紫外光降解和有无活性炭条件下的微囊藻毒素-LR(MCLR)降解试验,得出在紫外光照下,MCLR不会自身降解,且紫外光照对活性炭吸附性能无明显影响。此外,研究了不同负载次数的催化剂对MCLR的吸附和光催化氧化降解影响。结果表明,负载一次的光催化剂吸附和光降解效率均最佳,对于初始浓度为100.00μg/L的MCLR溶液,保持催化剂浓度为3 g/L,负载一次的催化剂反应15 min后,94%的MCLR可被降解,20 min后可完全降解。其去除机制主要是被吸附在活性炭上的MCLR向TiO2表面连续迁移与TiO表面光催化降解,连续的迁移与TiO表面光催化氧化使得MCLR得以高效的去除。
The titanium dioxide catalyst supported on activated carbon is prepared by sol-gel method.The experimental techniques of XRD,SEM and TEM are used to characterize the prepared specimens.The experiment of microcystin-LR（MCLR） degradation is investigated under different conditions that whether UV exists or not,and whether activated carbon exists or not.It concludes that MCLR is not self-degradation under UV irradiation,and UV irradiation has no obvious effect on the adsorption properties of activated carbon.We also investigate the effects of loading times on the removal of MCLR.The results show that both adsorption and degradation are the most effective under the photocatalyst that coated one time.When we apply 3 g/L photocatalyst and 100.00 μg/L MCLR solution,the removal efficiency at 15 min and 20 min are 94% and almost 100%,respectively.The removal mechanisms is mainly that MCLR adsorption on active carbon moves to TiO2 surface continuously and does photocatalysis degradation.The combined of activated carbon and TiO2 show the synergetic effects,which enhances the absorption and removes the target contaminant efficiently.
出处
《环保科技》
2011年第2期5-9,共5页
Environmental Protection and Technology
关键词
活性炭
吸附
二氧化钛光催化
微囊藻毒素-LR
activated carbon
absorption
titanium dioxide photocatalysis
microcystin-LR
