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壳聚糖包覆介孔微孔分子筛去除水中的氨氮

Chinese Journal of Environmental Engineering(2015)

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Abstract
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pH、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,pH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.
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