摘要
研究了蜂窝陶瓷对臭氧化降解苯乙酮效率的影响.结果表明,蜂窝陶瓷显著提高了臭氧化降解苯乙酮的效率,叔丁醇的试验表明该体系遵循.OH氧化机理.蜂窝陶瓷催化臭氧化降解苯乙酮的动力学可分为2个阶段,第一阶段的表观动力学常数为8.77×10-4s-1,Rct为10.34×10-10;第二阶段的表观动力学常数为4.63×10-3s-1,Rct为172.34×10-10.基于降解过程的色度变化和水样原子吸收的分析结果,结合降解动力学可以推测:降解过程中蜂窝陶瓷催化剂中Ti4+的溶出是苯乙酮降解效率提高的主导因素.
The effect of honeycomb-like ceramic on the efficiency of ozonation of acetophenone in water was investigated. The results showed that the presence of honeycomb-like ceramic can significantly improve the efficiency of ozonation of acetophenone. Based on a test with added tert-butanol,this catalytic ozonation system may follow the mechanism of ·OH oxidation. The kinetics of honeycomb-like ceramic catalytic ozonation of acetophenone could be divided into two stages. The values of the apparent reaction rate constant and Rct were 8.77×10-4 s-1 and 10.34×10-10 for the first stage; and 4.63×10-3 s-1 and 172.34×10-10 for the second stage. Based on the change of water color,atomic absorption spectrometry results and the degradation kinetics,we speculate that the enhanced degradation efficiency is mainly attributed to Ti4＋ leaching from the honeycomb-like ceramic.
出处
《环境科学学报》
CAS
CSCD
北大核心
2010年第10期2043-2048,共6页
Acta Scientiae Circumstantiae
基金
国家自然科学基金项目(No.50578146, 20876151)
高等学校博士点专项科研基金项目(No.SRFDP-20070337001)~~
关键词
苯乙酮
催化臭氧
蜂窝陶瓷
羟基自由基
降解
acetophenone
catalytic ozonation
honeycomb-like ceramic
hydroxyl radical
degradation
