高岭石基介孔复合材料的二氧化碳吸附性能  

Carbon Dioxide Adsorption Property of Kaolinite-Based Mesoporous Composites

作　　者：陈心怡 程宏飞[1] 赵炳新 胡棉舒 贾晓辉 CHEN Xinyi;CHENG Hongfei;ZHAO Bingxin;HU Mianshu;JIA Xiaohui(School of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《人工晶体学报》2021年第9期1756-1764,共9页Journal of Synthetic Crystals

基　　金：山西省科技重大专项(20181101003);内蒙古准格尔旗科技计划。

摘　　要：碳排放量的快速增长所引起的全球气候变暖问题越来越受到各国的关注,因此研发制备可行高效的二氧化碳(CO_(2))捕获材料具有极其重要的意义。本文以高岭石为原材料,采用煅烧-碱活化-酸刻蚀的方法,制备出介孔氧化硅载体(KNH),再将KNH经过五乙烯六胺(PEHA)修饰后制备出介孔复合材料(KNH-PEHA)。通过X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)、N_(2)物理吸附等方法对样品进行表征,并进一步对样品进行CO_(2)吸附性能研究。结果表明,PEHA的浸渍修饰并未改变载体的结构,但显著提高了介孔复合材料对CO_(2)的吸附能力。吸附温度为25℃,KNH的CO_(2)吸附量为147.39 cm^(3)/g,而PEHA质量分数为30%的KNH(KNH-P-30)平衡时的CO_(2)吸附量达到389 cm^(3)/g,远高于未经PEHA修饰的KNH的吸附量,同时提出了该固体吸附剂对CO_(2)的吸附机理,为高岭石在气体吸附领域的应用提供一个新思路。The problem of global warming caused by the rapid growth of carbon emissions has attracted more and more attention in all countries,so it is of great importance to develop feasible CO_(2)capture materials.In this paper,kaolinite is used as raw material,to prepare mesoporous silica carrier(KNH)with the method of calcination-alkali activation-acid etching.Then the pentaethylenehexaamine(PEHA)functionalized mesoporous silica(KNH-PEHA)was synthesized via impregnation.The prepared samples were characterized by X-ray diffraction(XRD),Fourier transformation infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),and N_(2) adsorption-desorption isotherms treated by BET(Brunauer-Emmett-Teller)analysis.And the solid adsorbent is also used to study the adsorption property of carbon dioxide(CO_(2)).The results indicate that the structure of PEHA-loaded KNH is not changed,but its carbon dioxide adsorption capacity is improved.When the adsorption temperature is 25℃,the CO_(2)adsorption capacity of KNH is 147.39 cm^(3)/g,and the CO_(2)adsorption capacity of KNH(KNH-P-30)with a mass percentage of PEHA of 30%reaches 389 cm^(3)/g,which is much higher than that without PEHA modified KNH adsorption.At the same time,it express the adsorption mechanism of the solid adsorbent for CO_(2),which provides a new idea for the application of kaolinite in the field of gas adsorption.

关 键 词：高岭石 介孔复合材料 五乙烯六胺 二氧化碳 吸附性能 

分 类 号：TB33[一般工业技术—材料科学与工程]