摘要
矿化效率不足是光催化净化VOCs技术应用的主要瓶颈之一。为提升矿化效率,以十二胺为模板剂,在P25表面构建微孔二氧化钛同质吸附层。利用表面光电压谱、氮气等温吸附-脱附、X射线衍射等研究其结构特性和对甲苯的光催化降解,并探讨微孔TiO_2和P25复合比例对催化剂性能的影响。结果发现,随着微孔复合比例增加,比表面积和甲苯平衡吸附量均显著提高。微孔复合比例小导致吸附对甲苯矿化的强化作用不明显,而微孔复合比例过高则造成材料光生载流子分离效率下降。微孔TiO_2和P25复合比例为8∶5时,催化剂对甲苯的矿化效率最高,分别是P25和微孔TiO_2的3.14和1.85倍。
Mineralization efficiency is one of the main bottlenecks in the application of VOCs photocatalytic degradation.In order to improve mineralization efficiency,microporous titanium layer was constructed on the surface of P25 using 12-amino-dodecylamine as the template.The structural characteristics and photocatalytic degradation of toluene were studied by surface photovoltage measurement system,nitrogen isothermal adsorption-desorption and X-ray diffraction.The results showed that the surface area and the equilibrium adsorption amount of toluene increased with the mole ratio of microporous composite to P25.The relatively low ratio limited the adsorption amount of toluene,whereas the separation efficiency of charge carriers decreased when the coated microporous TiO_2 too thick.The microporous-P25 composite with mole ratio of 8 ∶ 5 showed the highest mineralization efficiency of toluene,3.14 and 1.85 times higher than those of P25 and microporous TiO_2,respectively.
作者
张旻
高俊贤
王艳红
王硕
李激
吕金泽
ZHANG Min GAO Junxian WANG Yanhong WANG Shuo LI Ji LYU Jinze(Sehool of Environment and Civil Engineering,Jiangnan University, Wuxi 214122, China Jiangsu Key Laboratory of Anaerobie Bioteehnology ,Jiangnan University ,Wuxi 214122 ,China Jiangsu College of Water Treatment Technology and Material Collaborative Innovation Center, Suzhou 215009, China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第10期5523-5528,共6页
Chinese Journal of Environmental Engineering
基金
江苏省青年科学基金资助项目(BK20150126)
绿色催化四川省高校重点实验室开放基金资助项目(LZJ14203)
中央高校基本科研业务费专项(JUSRP11522)
关键词
TIO2
载流子
甲苯
矿化效率
TiO_2
carrier
toluene
mineralization efficiency
