Carbon dioxide adsorption behaviors of aluminum-pillared montmorillonite-supported alkaline earth metals  

作　　者：Kai Wu Qing Ye Runping Wu Sha Chen Hongxing Dai 

机构地区：[1]Key Laboratory of Beijing on Regional Air Pollution Control,Department of Environmental Science,College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China [2]Beijing Key Laboratory for Green Catalysis and Separation,Key Laboratory of Beijing on Regional Air Pollution Control,Key Laboratory of Advanced Functional Materials,Education Ministry of China,and Laboratory of Catalysis Chemistry and Nanoscience,Department of Chemistry and Chemical Engineering,College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China

出　　处：《Journal of Environmental Sciences》2020年第12期109-117,共9页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 21277008 and 20777005);the National Key Research and Development Program of China (No. 2017YFC0209905)。

摘　　要：The Al-pillared montmorillonite-supported alkaline earth metal 5M/Al-PILC(PILC = pillared clay, M = Mg, Ca, Sr, and Ba) and x Mg/Al-PILC( x = 1, 3, 5, and 7 wt.%) samples were prepared using an impregnation method. Physical properties of the materials were determined by means of X-ray diffraction(XRD) and N2 adsorption-desorption, and their CO2 adsorption behaviors were investigated using the thermogravimetric analyzer(TG), CO2 temperatureprogrammed desorption(CO2-TPD), and in situ diffuse reflectance infrared transform spectroscopy(in situ-DRIFTS) techniques. It is shown that 5 Mg/Al-PILC possessed the highest CO2 adsorption capacity(2.559 mmol/g). The characterization results indicate that Alpillaring increased the specific surface area of montmorillonite, which was beneficial for the adsorption of CO2. The CO2 adsorption process on the sample was mainly chemical adsorption, and alkalinity was the main factor influencing its adsorption capacity. The alkalinity of the sample was enhanced by loading an appropriate amount of alkaline earth metal, and the adsorbed CO2 was present in the form of bicarbonate and carbonate. In addition, the 5Mg/Al-PILC sample exhibited an excellent regeneration efficiency. We believe that the outcome of this research would provide a good option for developing highly effective CO2 adsorption materials.

关 键 词：MONTMORILLONITE Al-pillaring ADSORBENT CO2 adsorption Alkaline earth metal 

分 类 号：X701[环境科学与工程—环境工程]