Preparation of TEPA modified expanded vermiculite and experimental testing for CO2 capture
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 CO2 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 CO2 adsorption.The impact of TEPA loading capacity and temperature on the adsorption properties of CO2 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 CO2 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 CO2 capture capability,while also providing a reference scheme for selecting appropriate CO2 adsorbents in industrial application.
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