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| Research on Ca2+ adsorption using Na-montmorillonite through different pretreatment methods |
| Received:August 03, 2017 |
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| KeyWord:Na-montmorillonite;pretreatment;surface property;adsorption;cadmium |
| Author Name | Affiliation | E-mail | | WEI Feng | Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | XU Huai-zhou | Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection, Nanjing 210042, China | | | XIANG Chun-xiao | Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | LIU Ying | Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | YUAN Lin | Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | | YANG Gang | Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | yg8813@163.com |
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| Abstract: |
| In this paper, 4 Na-montmorillonites were prepared by 4 pretreatment methods, including oven-drying at 100℃, calcination at 200℃ and 300℃, and freeze-drying. Their physical and chemical properties were investigated. Meanwhile, the adsorption behaviors of the obtained Na-montmorillonites with regard to Cd2+ was discussed. The purpose was to investigate the influence of different pretreatment methods on the physicochemical properties of Na-montmorillonite and its difference in the adsorption of Cd2+. Results showed that the different pretreatment methods had a significant influence on the physical properties, such as the specific surface area, pore volume, and interlayer spacing. However, the effects on chemical properties, such as surface functional groups and cation exchange capacity, were not obvious. The adsorption could achieve equilibrium in 24 hours, while the adsorption kinetics indicated that the quasi-second-order kinetic equation was more suitable for describing the adsorption process, indicating ion-exchange adsorption. The adsorption isotherm was in accordance with the Langmuir isotherm model, partially proving single-layer adsorption. The maximum adsorption capacity of Na-montmorillonite could be achieved by calcination at 300℃, with an adsorption capacity of 11.1 mg·g-1. However, only 9.1 mg·g-1 Cd2+ could be adsorbed, as Na-montmorillonite from the oven-drying treatment at 100℃ was employed. |
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