摘要
分析了吸附剂的孔隙结构与碱性官能团在CO_(2)捕集过程中起重要作用的原因。为提高生物炭吸附性能,以Fe(OH)_(3)为前驱体,采用浸渍法调变了生物炭理化性质,制得了铁浸渍生物炭并考察了其吸附CO_(2)特性。结果表明,铁浸渍后以Fe_(2)O_(3)形式被成功负载到了生物炭上,浸渍后生物炭的比表面积与微孔体积均得到了提高;当吸附温度由0℃升高至25℃,吸附量会降低57.37%~50.42%,CO_(2)在生物炭上的吸附为放热过程。线性相关分析表明,比表面积与微孔体积是影响CO_(2)吸附容量的主要因素。Avrami模型和Langmuir模型能够较好地拟合CO_(2)在生物炭上的吸附过程,表明该吸附由物理与化学机理共同作用,且以单层吸附为主。铁浸渍生物炭是一种具有潜力的CO_(2)吸附剂。
The important role of the pore structure and alkaline functional groups of the adsorbent in CO_(2)capture process is analyzed.In order to improve the adsorption performance of biochar,iron-impregnated biochar is obtained by using Fe(OH)_(3)as the precursor,and the CO_(2)adsorption properties are studied.The results show that Fe_(2)O_(3)is successfully loaded in biochar,both the specific surface area and micropore volume of iron-impregnated biochar are increased.When the adsorption temperature increases from 0℃to 25℃,the adsorption capacity will decrease by 57.37%-50.42%,and the adsorption of CO_(2)on biochar is an exothermic process.Linear correlation analysis show that the specific surface area and the micropore volume are the key factors affecting the CO_(2)adsorption capacity.Both Avrami model and Langmuir model can well fit the adsorption process of CO_(2)on biochar,which indicate that the CO_(2)adsorption on biochar is mainly monolayer adsorption with combining physical and chemical mechanisms.Iron-impregnated biochar is a potential CO_(2)adsorbent.
作者
戴欢涛
游新秀
徐浩亮
汪涛
张学杨
DAI Huantao;YOU Xinxiu;XU Haoliang;WANG Tao;ZHANG Xueyang(School of Environmental Engineering,Xuzhou Institute of Technology,Xuzhou 221018,Jiangsu,China)
出处
《能源化工》
CAS
2023年第5期10-15,共6页
Energy Chemical Industry
基金
徐州市科技计划项目(KC21288)。
作者简介
戴欢涛(2002-),男,本科,主要研究方向为生物炭及环境治理技术。E-mail:daihuanta@163.com;通信作者:张学杨(1982-),男,博士,教授,研究方向为生物炭及环境污染治理技术。E-mail:zhaxuy@163.com。
