TEPA改性膨胀蛭石复合材料的制备及其CO_(2)吸附性能研究

Preparation of TEPA modified expanded vermiculite and experimental testing for CO_(2) capture

工业化进程中排放的二氧化碳加剧了温室效应,对全球气候环境产生了严重影响。目前,液胺吸收CO_(2)是最成熟的碳捕获技术,其具备高吸收容量、快吸收速率和简单再生过程等优点。然而,该技术仍存在着许多缺陷,如设备腐蚀、再生能耗高、环境污染等。针对上述问题,提出一种将四亚乙基五胺(TEPA)负载到膨胀蛭石夹层中制备新型载胺复合材料(EV-TEPA)以吸附CO_(2)的方法,并重点探讨了不同TEPA负载量和温度对CO_(2)吸附性能的影响。结果表明,高温煅烧后的膨胀蛭石(EV)具备优越的分层孔隙结构,其对胺的负载量远大于蛭石原矿(RV)。EV-TEPA吸附剂在75℃时吸附容量最高,为1.24 mmol/g,并且在经历8个循环后吸附容量仅衰减8.87%,表现出良好的循环稳定性。此研究探索了一种经济高效捕获CO_(2)的新型复合材料,为工业应用中CO_(2)吸附剂选择提供了一个参考方案。

Carbon dioxide emitted in the process of industrialization aggravates the greenhouse effect and has a serious impact on the global climate environment.Currently,the utilization of liquid amines for CO_(2) absorption represents a well-established carbon capture technology,characterized by its notable advantages including high absorption capacity,rapid absorption rate,and straightforward regeneration process.However,this capture technology still exhibits several drawbacks such as equipment corrosion high renewable energy consumption,and environmental pollution.To solve these problems,a novel composite material(EV-TEPA)with amine functionality was synthesized by incorporating tetraethylene pentaamine(TEPA)onto the interlayers of expanded vermiculite for efficient CO_(2) adsorption.The impact of TEPA loading capacity and temperature on the adsorption properties of CO_(2) was thoroughly investigated.The results show that expanded vermiculite(EV)with larger pore volume after expansion has superior layered pore structure,and its amine loading capacity is much greater than that of raw vermiculite(RV).EV-TEPA has the highest CO_(2) adsorption capacity of 1.24 mmol/g at 75℃,and its adsorption capacity decreases by only 8.87%after 8 cycles compared with the first cycle,showing great cycling stability.This paper presents a novel composite material that exhibits both economic and efficient CO_(2) capture capability,while also providing a reference scheme for selecting appropriate CO_(2) adsorbents in industrial application.