题名: Cation exchange, interlayer spacing, and thermal analysis of Na/Ca-montmorillonite modified with alkaline and alkaline earth metal ions
作者: Li Yan; Wang Xiaojun; Wang Juanfang
; Alkaline metals
; Alkaline earth metals
; Cation exchange ability
; Interlayer spacing
; Thermal analysis
刊名: Journal of Thermal Analysis and Calorimetry
卷: 110, 3, 1199-1206
英文摘要: Na-montmorillonites were exchanged with Li +, K +, Rb +, Cs +, Mg 2+, Ca 2+, Sr 2+, and Ba 2+, while Ca-montmorillonites were treated with alkaline and alkaline earth ions except for Ra 2+ and Ca 2+. Montmorillonites with interlayer cations Li + or Na + have remarkable swelling capacity and keep excellent stability. It is shown that metal ions represent different exchange ability as follows: Cs + > Rb + > K + > Na + > Li + and Ba 2+ > Sr 2+ > Ca 2+ > Mg 2+. The cation exchange capacity with single ion exchange capacity illustrates that Mg 2+ and Ca 2+ do not only take part in cation exchange but also produce physical adsorption on the montmorillonite. Although interlayer spacing d001 depends on both radius and hydration radius of interlayer cations, the latter one plays a decisive role in changing d001 value. Three stages of temperature intervals of dehydration are observed from the TG/DSC curves: the release of surface water adsorbed (36-84 °C), the dehydration of interlayer water and the chemical-adsorption water (47-189 °C) and dehydration of bound water of interlayer metal cation (108-268 °C). Data show that the quantity and hydration energy of ions adsorbed on montmorillonite influence the water content in montmorillonite. Mg 2+-modified Na-montmorillonite which absorbs the most quantity of ions with the highest hydration energy has the maximum water content up to 8.84%. © 2011 Akade´miai Kiado´, Budapest, Hungary.
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作者单位: Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China;Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
Li Yan,Wang Xiaojun,Wang Juanfang. Cation exchange, interlayer spacing, and thermal analysis of Na/Ca-montmorillonite modified with alkaline and alkaline earth metal ions[J]. Journal of Thermal Analysis and Calorimetry,2012,110(3):1199-1206.