摘要
实验比较了单独臭氧氧化、蜂窝陶瓷催化臭氧化和蜂窝陶瓷催化剂吸附3种工艺去除水中草酸的降解效果.结果表明,蜂窝陶瓷催化臭氧化、单独臭氧氧化和蜂窝陶瓷催化剂吸附对水中草酸的去除率分别为37.6%、2.2%和0.4%,蜂窝陶瓷催化剂的存在显著提高了臭氧氧化降解水中草酸的去除效果.添加叔丁醇的浓度为5、10和15 mg.L-1时,催化臭氧化对草酸的去除率分别降低了24.1%、29.0%和30.1%,证明蜂窝陶瓷催化臭氧化降解水中草酸遵循.OH氧化机理,即非均相的催化剂表面强化了.OH的引发.TOC测试结果显示,蜂窝陶瓷催化臭氧化工艺可以将草酸彻底矿化,无中间产物生成.反应温度与草酸的去除效果成正相关性,当水体温度为10、203、0和40℃时,蜂窝陶瓷催化臭氧化降解水中草酸的去除率分别为16.4%、37.6%、61.3%和68.2%.
Comparative experiments for the degradation of oxalic acid in aqueous solution were carried out in the three processes of ozonation alone, ceramic honeycomb-catalyzed ozonation and ceramic honeycomb adsorption. The results show that the degradation rates of oxalic acid in the ceramic honeycomb-catalyzed ozonation, ozonation alone and ceramic honeycomb adsorption systems are 37.6% , 2.2% and 0.4% , and the presence of ceramic honeycomb catalyst significantly improves the degradation rate of oxalic acid compared to the results from non-catalytic ozonation and adsorption. With the addition of tert-butanol, the degradation rates of oxalic acid in catalytic ozonation system decrease by 24.1%, 29.0% and 30.1%, respectively, at the concentration of 5, 10 and 15 mg·L^-1. This phenomenon indicates that ceramic honeycomb-catalyzed ozonation for the degradation of oxalic acid in aqueous solution follows the mechanism of · OH oxidation, namely the heterogeneous surface of catalyst enhances the initiation of · OH. The results of TOC analysis demonstrate that the process of ceramic honeycomb-catalyzed ozonation can achieve the complete mineralization level without the formation of intermediary degradation products. The experimental results suggest that the reaction temperature has positive relationship with the degradation rate of oxalic acid. The degradation rates of oxalic acid in the ceramic honeycomb-catalyzed ozonation system are 16.4%, 37.6%, 61.3% and 68.2%, at the respective reaction temperature of 10, 20, 30 and 40℃.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2007年第11期2533-2538,共6页
Environmental Science
基金
国家自然科学基金项目(50378028)
关键词
蜂窝陶瓷
催化臭氧化
降解
草酸
叔丁醇
.OH
矿化
温度
ceramic honeycomb
catalytic ozonation
degradation
oxalic acid
tert-butanol
· OH
mineralization
temperature
