木质素浸渍柚子皮生物炭吸附CO_(2)特性  

Adsorption properties of CO_(2) on pomelo peel biochar impregnated bylignin

作　　者：戴欢涛 曹苓玉 游新秀 徐浩亮 汪涛 项玮[1] 张学杨[1] DAI Huantao;CAO Lingyu;YOU Xinxiu;XU Haoliang;WANG Tao;XIANG Wei;ZHANG Xueyang(School of Environmental Engineering,Xuzhou Institute of Technology,Xuzhou 221018,Jiangsu,China)

机构地区：[1]徐州工程学院环境工程学院,江苏徐州221018

出　　处：《化工进展》2023年第S01期356-363,共8页Chemical Industry and Engineering Progress

基　　金：江苏省自然科学基金(BK20201151);徐州市科技计划(KC21288);江苏省高等学校自然科学研究重大项目(19KJA580002)

摘　　要：吸附剂的孔隙结构在CO_(2)捕集过程中起着重要作用。本文为提高生物炭吸附性能,以木质素为前体,采用浸渍法调变了生物炭孔隙结构,并研究了其吸附CO_(2)特性。结果表明,木质素浸渍后生物炭的比表面积、微孔体积以及碱度分别提高了3.7倍、8.3倍与1.6倍,CO_(2)吸附容量从43.15mg/g提升至47.36mg/g;线性相关分析表明,比表面积、微孔体积与碱度是决定CO_(2)吸附容量的关键因素。Avrami模型和Langmuir模型能够较好地拟合生物炭对CO_(2)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。当吸附温度由0℃升高至25℃,吸附量降低了46.5%~52.7%,CO_(2)在生物炭上的吸附为放热过程。10次吸附/解吸循环后,生物炭具有高达97.3%~99.3%的重复利用率,表明浸渍生物炭具有良好的可重复使用性,是一种具有潜力的CO_(2)吸附剂。The pore structure of adsorbent plays an important role in the process of CO_(2) capture.In order to improve the adsorption performance of biochar,the pore structure of biochar was modified by impregnation method using lignin as precursor,and the adsorption properties of CO_(2) were studied.The results showed that the specific surface area,micropore volume and alkalinity of biochar after lignin impregnation were increased by 3.7 times,8.3 times and 1.6 times,respectively,and the CO_(2) adsorption capacity was increased from 43.15mg/g to 47.36mg/g.The linear correlation analysis showed that specific surface area,micropore volume and alkalinity were the key factors to determine the adsorption capacity of CO_(2).The Avrami model and Langmuir model could well fit the adsorption process of CO_(2) by biochar,which indicates that the adsorption was mainly monolayer adsorption with the combined action of physical and chemical mechanisms.When the adsorption temperature increased from 0℃to 25℃,the adsorption capacity decreases by 46.5%—52.7%,and the adsorption of CO_(2) on biochar is an exothermic process.After 10 adsorption/desorption cycles,the biochar had a high reuse rate of 97.3%—99.3%,indicating that the impregnated biochar had good reusability and was a potential CO_(2) adsorbent.

关 键 词：生物炭 二氧化碳捕集 木质素 浸渍 

分 类 号：X511[环境科学与工程—环境工程]