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Ammonium removal from aqueous solutions using microwave-treated natural Chinese zeolite

机译：使用微波处理的天然中国沸石从水溶液中去除铵

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摘要

In this study,natural Chinese zeolite pretreated by sodium chloride solution under microwave irradiation was used to remove ammonium from aqueous solution.Adsorption kinetics,adsorption equilibrium isotherms and the effect of the individual presence of other cations and humic acid on the removal of ammonium were investigated by conducting a series of batch experiments.The zeolite treated under microwave irradiation had the highest ammonium adsorption capacity value,followed by the zeolite obtained by thermal process and the untreated zeolite.The kinetic studies confirmed that the adsorption of ammonium on the zeolite treated under microwave irradiation could be described by the pseudo-second-order kinetic model,and mtra-particle diffusion controlled the limiting rate of the adsorption process.Five isotherm models were used to describe the isotherm data.Three-parameter isotherm models(Redlich-Peterson and Langmuir-Freundlich)provided much better isotherm data fitting than two-parameter isotherm models(Freundlich,Temkin and Langmuir).The presence of Na~+,K~+,Ca~(2+)and Mg~(2+)could reduce the uptake of ammonium onto the zeolite treated under microwave irradiation and the order of ammonium ion over other cations was Na~+ > K~+ > Ca~(2+)> Mg~(2+),while the presence of humic acid increased the uptake of ammonium.Due to their low cost,high adsorption capacity and selectivity,the zeolite treated under microwave irradiation has the potential to be utilized for cost-effective removal of ammonium from wastewater.
机译：本研究采用氯化钠溶液在微波辐射下预处理的天然沸石从水溶液中去除铵。研究了吸附动力学，吸附平衡等温线以及其他阳离子和腐殖酸的单独存在对铵去除的影响。通过一系列分批实验，微波辐照处理后的沸石具有最高的铵吸附容量值，其次是热加工得到的沸石和未经处理的沸石。动力学研究证实，微波处理后的沸石对铵的吸附能力强。辐射可以用伪二级动力学模型来描述，微粒扩散控制了吸附过程的极限速率。五个等温模型用来描述等温数据。三参数等温模型（Redlich-Peterson和Langmuir） -Freundlich）提供了比两参数更好的等温线数据拟合等温模型（Freundlich，Temkin和Langmuir）。Na〜+，K〜+，Ca〜（2+）和Mg〜（2+）的存在可能会减少微波辐射下沸石对铵的吸收，并且顺序铵离子对其他阳离子的吸附量为Na〜+> K〜+> Ca〜（2 +）> Mg〜（2+），而腐殖酸的存在增加了铵的吸收。由于它们的低成本，高吸附能力在选择性和选择性方面，在微波辐射下处理的沸石具有可用于经济高效地从废水中去除铵的潜力。

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