超声强化催化臭氧降解水中氨氮的研究  

Study on degradation of ammonia nitrogen in water by ultrasonic enhanced catalytic ozonation

作　　者：李畅 陈云嫩[1] 郭琳[1] 刘晨[1] LI Chang;CHEN Yun-nen;GUO Lin;LIU Chen(Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学江西省矿冶环境污染控制重点实验室

出　　处：《现代化工》2019年第6期100-103,共4页Modern Chemical Industry

基　　金：国家自然科学基金资助(51568023,51864021)

摘　　要：水中过量氨氮是导致水体富营养化的主要原因之一。通过超声波强化催化臭氧对含氨氮水进行降解,考察了Sr(NO3)2浓度及煅烧温度对负载活性Al2O3载体催化剂效果的影响。结果发现,以Sr(NO3)2浓度为0.10mol/L、700℃下煅烧4 h得到的Sr/Al2O3作为负载型催化剂催化水中氨氮效果较好。超声使得Sr/Al2O3催化臭氧氧化降解含氨氮水反应时间从120min缩短至60min,而氨氮降解率从52.95%提高至83.20%,气态氮占比从37.40%提高至51.80%。SEM分析结果表明,经700℃煅烧得到的Sr/Al2O3呈粒子联结体,且大小均匀、表面粗糙、凹凸不平。因此,超声的引入促进了催化剂表面N—H键的裂解,有助于水中氨氮的降解。Excessive ammonia-nitrogen in water is one of the main reasons leading to the eutrophication of water body.In this paper,the degradation of ammonia-containing water by catalytic ozone enhanced by ultrasonic is studied.The effects of Sr(NO3)2 concentration and calcination temperature on the activity of supported Al2O3 catalyst are investigated.The results demonstrate that Sr/Al2O3 catalyst prepared by calcining 0.10 mol·L^-1 Sr(NO3)2 at 700℃ for 4 h has better catalytic activity for ammonia nitrogen in water.With the enhancement of ultrasound,the reaction time spent by Sr/Al2O3 catalytic ozonation degradation of ammonia-containing water is shortened from 120 min to 60 min while the degradation rate of ammonia-nitrogen increases from 52.95% to 83.20% and the proportion of gaseous nitrogen increases from 37.40% to 51.80%.SEM analysis shows that Sr/Al2O3 calcined at 700℃ exhibits particle-bound and is uniform in size,rough and uneven in surface.Ultrasound promotes N-H bond to crack on the surface of the catalyst,which is helpful to the degradation of ammonia nitrogen in water.

关 键 词：氨氮 催化臭氧氧化 催化剂 超声强化 

分 类 号：X703.1[环境科学与工程—环境工程]