Chen Quanzhou, Zhou Kanggen, Chen Yan, Wang Aihe, Liu Fang
a Department of Environmental Engineering, School of Metallurgy and Environment , Central South University , Changsha , People's Republic of China.
b Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution , Changsha , People's Republic of China.
Environ Technol. 2017 Nov;38(22):2824-2834. doi: 10.1080/09593330.2017.1278793. Epub 2017 Jan 18.
In this paper, a poly ligand exchanger, Cu(II)-loaded chelating resin bearing the functional group of weak iminodiacetate acid was prepared to efficiently remove ammonia from solutions. Batch adsorption equilibrium experiments were conducted under a range of conditions to determine the optimum adsorption conditions. The effects of contact time, pH, resin dosage and temperature on the removal of ammonia by a Cu(II)-loaded resin were determined. The maximum removal efficiency was reached at pH 9.5 at room temperature, 25°C, in 300 min. The maximum ammonia adsorption capacity was found to be 45.66 mg/L. The maximum adsorption capacities decreased with the increasing of solution temperature. Langmuir, Freundlich and Temkin isotherm models were used for fitting the adsorption experimental data without competing ions and the Langmuir isotherm model was proved to be the best-fitting model by comparing the corresponding correlation coefficients (R) of the listed models. The effect of competing ions Na and Ca on the adsorption of the Cu(II)-loaded resin for ammonia was investigated. The results showed that the existing of competing ions had a negative effect on the ammonia removal. The adsorption capacities decreased with the increasing concentration of competing ions. The Langmuir isotherm model was used to fit the experimental data and proved efficient. The existing of competing ions in solutions was unfavorable for ammonia adsorption and the weakening effect of bivalent Ca was stronger than the monovalent Na. The ammonia adsorption capacity was relatively high compared with other ammonia adsorbents and the Cu(II)-loaded resin was an economically feasible and promising technology for ammonia removal.
本文制备了一种负载铜（II）的螯合树脂，该树脂带有弱亚氨基二乙酸官能团，作为一种多配体交换剂，用于高效去除溶液中的氨。在一系列条件下进行了间歇吸附平衡实验，以确定最佳吸附条件。研究了接触时间、pH值、树脂用量和温度对负载铜（II）树脂去除氨的影响。在室温25°C下，pH值为9.5、300分钟时达到最大去除效率。最大氨吸附容量为45.66mg/L。最大吸附容量随溶液温度升高而降低。使用朗缪尔、弗伦德利希和坦金等温线模型对无竞争离子的吸附实验数据进行拟合，通过比较所列模型的相应相关系数（R），证明朗缪尔等温线模型拟合效果最佳。研究了竞争离子Na和Ca对负载铜（II）树脂吸附氨的影响。结果表明，竞争离子的存在对氨的去除有负面影响。吸附容量随竞争离子浓度的增加而降低。使用朗缪尔等温线模型对实验数据进行拟合，证明该模型有效。溶液中竞争离子的存在不利于氨的吸附，二价Ca的削弱作用强于一价Na。与其他氨吸附剂相比，该负载铜（II）树脂的氨吸附容量较高，是一种经济可行且有前景的氨去除技术。
