吸附
蒙脱石
坡缕石
高岭石
化学
海泡石
蛭石
粘土矿物
水溶液
解吸
埃洛石
朗缪尔吸附模型
铵
离子交换
阳离子交换容量
无机化学
动力学
吸收(声学)
化学工程
矿物学
材料科学
有机化学
地质学
离子
土壤水分
工程类
复合材料
原材料
物理
土壤科学
量子力学
作者
Aref Alshameri,Hongping He,Jianxi Zhu,Yunfei Xi,Jianxi Zhu,Longlong Ma,Tao Qi
标识
DOI:10.1016/j.clay.2017.11.007
摘要
This research presented six natural clay minerals (NCM) evaluated for the effectiveness of NH4+ adsorption from aqueous solution. For the first time, the NH4+ adsorption capacities of kaolinite, halloysite, montmorillonite, vermiculite, palygorskite, and sepiolite were examined and compared in the same study. All the NCM were fully characterized by XRD, SEM/EDS, XRF,FTIR, CEC, zeta potential and nitrogen adsorption-desorption isotherms to better understand the adsorption mechanism-property relationship. Adsorption kinetics showed that the adsorption behavior followed the pseudo-second-order kinetic model. The adsorption isotherms fitted by the Langmuir model illustrated that among all the NCM studied, vermiculite (50.06 mg/g) and montmorillonite (40.84 mg/g) showed the highest ammonium adsorption capacities. Our results revealed that the cation exchange is the main mechanism for the NH4+ adsorption. Additionally, negatively charged surface, water absorption process and surface morphology of NCM might also contribute to the high adsorption capacity for the NH4+. The maximum adsorption capacities for all NCM were rapidly obtained within 30 min with a dosage of 0.3 g/25 mL at pH of 7. The results illustrated that the NCM have significant potential as economic, safe and effective adsorbent materials for the NH4+ adsorption from the aqueous solution.
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