空气中CO_(2)原位高效捕集研究  

Experimental Study on CO_(2) Capture from the Air

作　　者：李雨欣 次仁罗布 郑嘉仁 刘倩倩 胡辉[1] 黄浩 Li Yuxin;Cirenluobu;Zheng Jiaren;Liu Qianqian;Hu Hui;Huang Hao(School of Environmental Science and Engineering,Huazhong University of Science and Technology,Hubei,430074)

机构地区：[1]华中科技大学环境科学与工程学院,湖北430074

出　　处：《当代化工研究》2024年第14期176-178,共3页Modern Chemical Research

基　　金：2022年湖北省自然科学基金青年项目“电化学催化氧化同时脱硫脱硝脱汞一体化机理探索和应用研究”(项目编号:2022CFB737);2023年华中科技大学大学生创新训练项目“低浓度二氧化碳的高效捕集和原位转化实验研究”(项目编号:HJ2023007)。

摘　　要：空气中低浓度CO_(2)的高效捕集是实现“碳中和”的重要路径。采用太阳能驱动空气泵加速CO_(2)的高效捕集,选取CaO、四乙烯五胺和NaOH溶液分别进行吸收,CaO粉末的CO_(2)日累积吸收量超过0.9 g。液相捕获剂中,CO_(2)日累积吸收量随NaOH浓度的上升而增加,0.50 mol/L的NaOH溶液中CO_(2)的吸收量可达0.776 g。CO_(2)小时吸收量小时变化趋势分析得出,其与光照强度和环境温度密切相关,进而影响了通过捕获剂的空气流量和CO_(2)总量;环境温度不仅影响了捕获剂吸收CO_(2)的反应速率,同时也极大程度上影响了气体在溶液中的溶解度。固体捕获剂CaO反应前后XRD分析,说明过程中生成了CaCO3。液相吸收剂蒸干处理后结晶产物XRD分析,说明反应过程中生成了CO32-。Efficient capture of low-concentration CO_(2) in the air is an important way to achieve"carbon neutrality".A solar-driven air pump was used to accelerate the efficient capture of CO_(2),and CaO,tetraethylenepentamine and NaOH solutions were selected for absorption respective-ly.The daily cumulative CO_(2) absorption of CaO powder exceeded 0.9 g.In liquid phase capture agents,the daily cumulative absorption of CO_(2) increased with the rising NaOH concentrations.The absorption of CO_(2) in a 0.50 mol/L NaOH solution could reach 0.776 g.The hourly change trend analysis of CO_(2) absorption showed that it is closely related to the light intensity and ambient temperature.The light intensity directly affected the ac-tual power of the solar-driven air pump,which in turn affected the air flow through the capture agent and the total amount of CO_(2).Ambient tempera-ture not only affected the reaction rate of the capture agent,but also greatly affected the solubility of gas in solution.XRD analysis before and after solid capture agent CaO showed that CaCO3 was generated.XRD analysis of the crystallized product after the liquid absorbent was evaporated to dryness showed that CO32-was generated.

关 键 词：CO_(2)捕集 低浓度 原位吸收 捕获剂 

分 类 号：X[环境科学与工程]