摘要
分别以阳极氧化铝、玻璃纤维布、玻璃作载体采用溶胶-凝胶法制备Ti O2纳米线阵列膜(Ti O2/AAO)与Ti O2/玻璃、Ti O2/玻布光催化剂,用XRD、电子探针和比表面仪进行表征,并对比其光催化不同浓度气相甲醛的降解活性.结果表明制备的Ti O2纳米线线径为26nm,线长1.2μm,与其他Ti O2载体相比,具有小密度、高比表面积,Ti O2/AAO光催化剂有较大反应速率常数及Langmuir吸附平衡常数,在UV下对低浓度气相甲醛有更多的活性吸附中心,这说明对低浓度气体,高比表面积催化剂有重要作用,它能更多地富集低浓度气体,提高光降解率.
The photocatalysts of TiO2 nanowires array film （TiO2/AAO） and TiO2/glass film, TiO2/ fiberglass cloth film were prepared by sol-gel chemistry and were characterized with XRD, electron probe microanalysis （EPMA） and specific surface area measurement. The photocatalytic activity for degradation of gaseous formaldehyde at different initial concentration were also studied and compared. The results showed that the TiO2 nanowires was uniform, about 26 nm in diameter and 1.2 μm in length. The TiO2/ AAO photocatalyst with smaller density and high specific surface area had the greatest reaction rate constant k and Langmuir adsorption constant K, and more adsorption active sites for gaseous formaldehyde at low concentration under UV light as compared with other supports. The high specific surface area photocatalyst played a bigger role in enriching gas and was more beneficial in enhancing photodegradation efficiency for low concentration gas.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第2期311-317,共7页
CIESC Journal
基金
江苏省自然科学基金项目(BK2001060).~~
关键词
TiO2纳米线阵列膜
气相甲醛
光催化
比表面积
吸附中心
TiO2 nanowires array film
gaseous formaldehyde
photocatalytic
specific surface area
size adsorption accessibility
