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0.10 mol/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120 min缩短至60 min，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.

李畅(1989-),男,硕士研究生,研究方向为废水处理及废渣资源化,976978782@qq.com