TiO_2-活性炭复合材料吸附及光催化净化甲醛的研究  

STUDY ON ADSORPTION AND PHOTOCATALYTIC DECOMPOSITION OF FORMALDEHYDE WITH TiO_2-ACTIVATED CARBON COMPOSITES

作　　者：黄彪[1] 陈学榕[1] 江茂生[1] 唐兴平[1] 廖益强 杨庆贤[1] 

机构地区：[1]福建农林大学材料工程学院,福建福州350002

出　　处：《林产化学与工业》2005年第3期38-42,共5页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(30371140);福建省自然科学基金资助项目(E0310024)

摘　　要：超临界乙醇条件下制备的TiO2-活性炭(Sc-TiO2-AC)复合材料,表征了所制备样品的结构,且对样品的吸附及光催化净化甲醛的性能进行了分析。实验表明,在超临界乙醇条件下可快速有效地制备出具很好的光催化与吸附协同效应的Sc-TiO2-AC复合材料。而且协同效应优于活性炭与Sc-TiO2样品的简单混合样品。研究表明产生这一协同效应时,光催化甲醛降解速率加快,同时光催化作用促使被活性炭吸附的污染物向TiO2表面迁移,使活性炭的吸附能力得以恢复,实现原位再生。实验表明,在300℃制备的Sc-TiO2-AC复合材料的甲醛去除率最高。300、350和400℃时的甲醛去除率在实验进行240min后分别达到100%、96%和93%。An effort was made to develop a photocatalytic TiO2-activated carbon composite from tetraisopropyl titanate-soaked activated carbon in supercritical ethanol, The structure of the composite was characterized,its effect on photocatalytic decomposition of formaldehyde was also evaluated. Results showed that the supercritically treated TiO2 activated carbon （Sc-TiO2-AC） composite had a much higher decomposing ability than that of the simple physical mixture of activated carbon and TiO2 granules. Moreover, the photocatalytic composite possesses high synergistic effect on adsorption and photocatalytic decomposition of formaldehyde, so that photocatalytic decomposition rate can be accelerated and the in-situ regeneration of the adsorbent can be achieved, Results show that at temperature of supercritical treatment 300 ℃, formaldehyde-removal rate of the composite is the highest. The formaldehyde-removal rates of the composites prepared by supercritical treatment at 300,350,400 ℃ are 100 % ,96 % ,93 %, respectively.

关 键 词：甲醛 超临界乙醇 TiO2-活性炭复合材料 光催化 

分 类 号：TQ424[化学工程] TQ426