基于二氧化钛-介孔硅复合材料的光催化毒气过滤器  

Photocatalytical Poison Gas Filter Based on Nano-TiO_2 Mesoporous Silica Composite

作　　者：苗竟 曾凡哲[3] 管磊 吴春晓 韩莎莎[3] 贺正权[1] 孔德鹏[1] 王丽莉[1,2] MIAO Jing;ZENG Fan-zhe;GUAN Lei;WU Chun-xiao;HAN Sha-sha;HE Zheng-quan;KONG De-peng;WANG Li-li(Research Department of Information Photonics, Xi＇an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences ,XiPan 710119, China;College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Science Beijing 101408, China;69081 PLA Troops, Urumchi 830000, China)

机构地区：[1]中国科学院西安光学精密机械研究所信息光子学室 [2]中国科学院大学材料与光电学院 [3]中国人民解放军69081部队

出　　处：《光子学报》2018年第7期94-100,共7页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.11474351;61275106;11504416)资助~~

摘　　要：介绍了一种介孔硅与纳米二氧化钛的复合方法,制备了兼具高吸附性与高光催化活性的纳米二氧化钛-介孔硅复合材料.在此基础上,以365nm波长的紫外LED为光源、特制的半泄露聚合物光纤为导光介质制造了一种新型的光催化毒气过滤器.实验结果表明:当LED光功率为540mW,复合材料装填量为350g时,该过滤器对甲醛气体的吸附量大于3mg;当过滤器达吸附饱和后,输入甲醛气流量为2L/min、浓度为0.7mg/m^3,实时分解甲醛的速率达72μg/h,输出气体中甲醛浓度降至0.09mg/m^3,低于国家卫生标准中的室内甲醛浓度的安全阈值.纳米二氧化钛-介孔硅复合光催化剂的吸附特性为光催化分解提供了充分的反应时间,有利于提高光催化分解效率,可以长时间循环工作,有望用于家庭空气净化,甚至取代现有的活性炭过滤器,用在长效的防毒面具等装置中.A composite method of mesoporous silicon and nano-TiO2 were reported,then a nano-TiO2-mesoporous-silica composite were fabricated,which is of high adsorption and high photocatalytic activity.On this basis,a new type of photocatalytic gas filter was constructed,by using UV LED with 365 nm wavelength as light source,custom made semi-leakage optical polymer fiber as light guide medium.Experimental results show that it has a capacity of adsorbing formaldehyde of more than 3 mg on the filter with 350 g composite photocatalyst loading,and LED light power of 540 mW.After the filter is adsorption saturated,the formaldehyde gas flow rate is 2 L/min,the inlet concentration is 0.7 mg/m3,the rate of real-time decomposition of formaldehyde reaches 72μg/h and the formaldehyde concentration in the output gas drops to 0.09 mg/m^3,which is lower than the safety threshold of indoor formaldehyde concentration in national sanitary standards.Adsorption characteristics of the composite photocatalyst provides sufficient reaction time for photocatalytic decomposition,which helps improve the photocatalytic decomposition efficiency,long-term cycle work,and it is expected to be used for home air purification,or even replace the existing activated carbon gas filter,and be used as a long-term gas masks and other devices.

关 键 词：光催化 二氧化钛 空气净化 光催化过滤器 甲醛 

分 类 号：O644.1[理学—物理化学] O648[理学—化学]