壳聚糖包覆介孔微孔分子筛去除水中的氨氮  

Removal of ammonia-nitrogen in wastewater by chitosan-coated micro-mesoporous zeolite

作　　者：郭祎阁[1,2] 赵颖[2,3] 郭宇杰[1] 李晓光[2] 彭星[2] 李曹乐[2] 刘文芳[2] 

机构地区：[1]华北水利水电大学水利学院,郑州450045 [2]中国环境科学研究院环境风险与基准评估国家重点实验室,北京100012 [3]广东省浩蓝环保水污染治理院士工作站,广州510630

出　　处：《环境工程学报》2015年第5期2067-2072,共6页Chinese Journal of Environmental Engineering

基　　金："十二五"国家科技支撑计划项目(2012BAJ21B04);国家自然科学基金青年基金资助项目(51108436)

摘　　要：以壳聚糖包覆介孔-微孔复合分子筛(CS/MCM-41-A)为吸附剂去除水中的氨氮,研究了反应时间、溶液p H、溶液氨氮初始浓度、CS/MCM-41-A投加量、竞争离子对吸附的影响,分析了CS/MCM-41-A的吸附动力学和热力学特征。结果表明,298 K下,当CS/MCM-41-A投加量为5 g/L,溶液氨氮初始浓度50 mg/L,p H为7,吸附时间为40 min时,溶液中氨氮的去除率达到74.35%,CS/MCM-41-A对离子的选择吸附顺序为Mg2+>K+>Ca2+>Na+。CS/MCM-41-A吸附氨氮符合拟二级动力学方程,吸附等温线更好地符合Freundlich方程,CS/MCM-41-A对氨氮的去除有良好的吸附性能。Chitosan-coated meso-microporous zeolite CS / MCM-41-A was used to remove ammonia-nitrogen from water. The influences of several important parameters on ammonium removal,such as the mass ratio of adsorbent dosage,contact time,p H value,initial ammonium concentration,competition ions were investigated.The kinetic and thermodynamic models were also analyzed. The results indicated that,under the condition of 298 K,when the dosage was 5 g / L,the initial ammonia concentration was 50 mg / L,the p H was 7,and the reaction time lasted 40 min,the removal rate of ammonia nitrogen was 74. 35%. The selectivity order over ammonium of other cations on CS / MCM-41-A was Mg2 +> K+> Ca2 +> Na+. The second-order kinetic model provided excellent kinetic data fitting. Freundlich model agreed more with experimental data. This proves that CS / MCM-41-A will be a good kind of potential materials of adsorption for ammonia nitrogen removal.

关 键 词：复合分子筛 壳聚糖 氨氮 吸附 

分 类 号：X703[环境科学与工程—环境工程]