Abstract

The ammonium ion occurrence in excess consequences in the adverse effects on the ecosystem, and human health. The experiment was conducted using the Chinese medical stone to remove ammonium ion from the water. The Chinese medical stone was modified by citric acid monohydrate and designed to identify the ammonium ion uptake capacity by the MMS and focused on evaluating the adsorption and kinetics isotherm, modifier’s concentration, contact time and initial concentration effects on MMS performance. The modification process was well-appointed by mixing and shaking at 180 rpm; at 60 °C; for eighth, at mixing ratio 1:20 of the UMMS with 0.2 mol concentration of citric acid monohydrate solution. The optimum adsorption performance was determined using Beaker sequence batch test method. The SEM micrographs; BET and FTIR of UMMS and MMS tests have undertaken and evaluated. The result showed that the maximum adsorption amount of MMS to ammonium ions was 5.38 mg/g at 50 mg/L ammonium ion concentration by the experiment, and the q_e max was 3.5 mg/g from Langmuir equation. The ammonium adsorption by the MMS had fitted for both the Langmuir isotherm and the Freundlich isotherm models and also adapted to the kinetic parameter pseudo-second-order model shows a superior expectation of the sorption kinetics.

Graphic abstract

中文翻译：

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改性中药石的制备及其对水中低浓度铵的去除性能

摘要

铵离子的过量产生会对生态系统和人类健康产生不利影响。该实验是使用中药石从水中去除铵离子进行的。用柠檬酸一水合物对中药石块进行改性，旨在通过MMS鉴定铵离子的吸收能力，并重点评估吸附和动力学等温线，改性剂的浓度，接触时间和初始浓度对MMS性能的影响。通过以180 rpm的速度混合并摇晃，可以很好地进行修饰。在60°C; 第八，以1∶20的UMMS与0.2摩尔浓度的柠檬酸一水合物溶液的混合比。使用Beaker顺序批处理测试方法确定最佳吸附性能。SEM显微照片；进行了UMMS和MMS测试的BET和FTIR并进行了评估。结果表明，在50 mg / L的铵离子浓度下，MMS对铵离子的最大吸附量为5.38 mg / g。根据Langmuir方程，q _e max为3.5mg / g。MMS对氨的吸附既适用于Langmuir等温线模型也适用于Freundlich等温线模型，并且还适用于动力学参数伪二级模型，显示出对吸附动力学的更高期望。

图形摘要