农业环境科学学报2018，Vol.37Issue(3)：456-463,8.DOI:10.11654/jaes.2017-1064
不同前处理方式下钠基蒙脱石对重金属镉的吸附研究
Research on Ca2+adsorption using Na-montmorillonite through different pretreatment methods
摘要
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 dif-ferent pretreatment methods had a significant influence on the physical properties,such as the specific surface area,pore volume,and inter-layer spacing.However,the effects on chemical properties,such as surface functional groups and cation exchange capacity,were not obvi-ous. 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-montmo-rillonite could be achieved by calcination at 300℃,with an adsorption capacity of 11.1 mg·g-1.However,only 9.1 mg·g-1Cd2+could be ad-sorbed,as Na-montmorillonite from the oven-drying treatment at 100℃was employed.关键词
钠基蒙脱石/前处理/表面特性/吸附/镉Key words
Na-montmorillonite/pretreatment/surface property/adsorption/cadmium分类
资源环境引用本文复制引用
魏凤,徐怀洲,向春晓,刘颖,袁林,杨刚..不同前处理方式下钠基蒙脱石对重金属镉的吸附研究[J].农业环境科学学报,2018,37(3):456-463,8.基金项目
国家自然科学基金青年科学基金项目(21507036) （21507036）
四川省教育厅重点项目(16ZA0043) （16ZA0043）
四川省科技厅重点项目(2015SZ0007)Project supported:The Young Scientists Fund of the National Natural Science Foundation of China(21507036) （2015SZ0007）
The Education Key Projects of Sichuan Provincial Department(16ZA0043) （16ZA0043）
Sichuan Provincial Science and Technology Department of Key Projects(2015SZ0007) （2015SZ0007）
