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环境化学  2015 

改性斜发沸石吸附水中氨氮的研究

Keywords: 钠型沸石,改性处理,氨氮,吸附

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Abstract:

研究了改性斜发沸石对水中氨氮的吸附行为,考察了pH值、氨氮初始浓度以及竞争阳离子等对钠型沸石吸附氨氮的影响,同时进行了钠型沸石的吸附动力学研究.结果表明,采用饱和氯化钠改性制备得到的钠型沸石具有较大的饱和吸附容量,受氨氮初始浓度和溶液pH值的影响,钠型沸石吸附氨氮的行为在YNH4+=0.5时发生偏离.竞争阳离子的存在在不同程度上抑制了钠型沸石对氨氮的吸附.钠型沸石吸附氨氮速率的控制步骤是内扩散步骤,可采用Vermeulen吸附模型加以描述.

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