摘要
采用电化学阳极氧化法制备二氧化钛纳米管(TNT),通过改变氧化时间和氧化电压来制备具有不同形貌结构的TNT,并探讨不同条件下制备的TNT对模拟污染物甲基橙的光电催化降解活性。结果表明,当氧化电压由45V增加到60V时,相同氧化时间下制得的TNT的管长、管径、长径比都明显增加,而管壁厚均相应减小,氧化时间和氧化电压对制得的TNT的管长、管径和管壁厚等形貌特征有着重要的影响;在45V、4h,60V、3h和60V、6h下制备的TNT具有较佳的形貌结构(管长分别为12.41、20.35、25.85μm,长径比分别为110、166、178),其中又以60V、6h时制备的TNT具有最佳的光电催化活性,其光电催化降解甲基橙的表观拟一级动力学速率常数为2.26×10-3 min-1;相关性分析结果表明,TNT的长径比对其光电催化活性有着极重要的影响。
Titania nanotube （TNT） was prepared by electrochemical anodization method. The obtained TNT was used for photo-electrocatalytic degradation of methyl orange, and the effect of anodizing voltage and anodizing time on the morphology, photoelectric performance and photo-electrocatalytic activity of TNT was investigated. It confirmed that anodizing voltage and anodizing time had significant effect on TNT morphology, when the anodizing voltage increased from 45 V from 60 V, the pore diameter, tube length and aspect ratio of TNT increased obviously under the same anodizing time, while the wall thickness of TNT was decreased. The TNT fabricated at 45 V for 4 h, fabricated at 60 V for 3 h and fabricated at 60 V for 6 h had perfect morphology, their tube length was 12.41, 20.35, 25.85 /;m and aspect ratio was 110, 166, 178 respectively. Among the 3 TNTs, the TNT fabricated at 60 V for 6 h exhibited the best photo-electrocatalytic activity, its pseudo-first-order reaction kinetic constant for methyl orange degradation was 2.26×10-3min-1. Relevant analysis showed that aspect ratio of TNT had an important influence on its photo-electrocatalytic activity.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2013年第4期17-21,共5页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.51178225)
教育部博士点基金资助项目(No.20110031110025)
天津市自然科学基金资助项目(No.09JCYBJC08000)
