Electrochemical CO_(2) mineralization for red mud treatment driven by hydrogen-cycled membrane electrolysis

查看全文 作　　者：Heping [1,2]Xie;Yunpeng [1]Wang;Tao [3]Liu;Yifan [3]Wu;Wenchuan [3]Jiang;Cheng [3]Lan;Zhiyu [3]Zhao;Liangyu [4]Zhu;Dongsheng [3]Yang

机构地区：[1]School of Chemical Engineering,Sichuan University,Chengdu 610065,China;[2]Institute of Deep Earth Science and Green Energy,Shenzhen University,Shenzhen 518060,China;[3]Institute of New Energy and Low-Carbon Technology,Sichuan University,Chengdu 610065,China;[4]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China

出　　处：《Chinese Journal of Chemical Engineering》索引2022年第35卷第3期,共10页

基　　金：funded by the Science and Technology Department of Sichuan Province(2020YFH0012)。 摘　　要：CO_(2)mineralization as a promising CO_(2)mitigation strategy can employ industrial alkaline solid wastes to achieve net emission reduction of atmospheric CO_(2).The red mud is a strong alkalinity waste residue produced from the aluminum industry by the Bayer process which has the potential for the industrial CO_(2)large scale treatment.However,limited by complex components of red mud and harsh operating conditions,it is challenging to directly mineralize CO_(2)using red mud to recover carbon and sodium resources and to produce mineralized products simultaneously with high economic value efficiently.Herein,we propose a novel electrochemical CO_(2)mineralization strategy for red mud treatment driven by hydrogen-cycled membrane electrolysis,realizing mineralization of CO_(2)efficiently and recovery of carbon and sodium resources with economic value.The system utilizes H_(2)as the redox-active proton carrier to drive the cathode and anode to generate OH^(-) and H^(+) at low voltage,respectively.The H^(+) plays as a neutralizer for the alkalinity of red mud and the OH^(-) is used to mineralize CO_(2)into generate highpurity NaHCO_(3)product.We verify that the system can effectively recover carbon and sodium resources in red mud treatment process,which shows that the average electrolysis efficiency is 95.3%with highpurity(99.4%)NaHCO_(3)product obtained.The low electrolysis voltage of 0.453 V is achieved at10 mA·cm^(-2) in this system indicates a potential low energy consumption industrial process.Further,we successfully demonstrate that this process has the ability of direct efficient mineralization of flue gas CO_(2)(15%volume)without extra capturing,being a novel potential strategy for carbon neutralization. 关键词：CO_(2)mineralization Red mud ELECTROLYSIS Waste treatment Flue gas

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Electrochemical CO_(2) mineralization for red mud treatment driven by hydrogen-cycled membrane electrolysis

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