化工进展 ›› 2023, Vol. 42 ›› Issue (S1): 356-363.DOI: 10.16085/j.issn.1000-6613.2023-0143

• 材料科学与技术 • 上一篇    下一篇

木质素浸渍柚子皮生物炭吸附CO2特性

戴欢涛(), 曹苓玉, 游新秀, 徐浩亮, 汪涛, 项玮, 张学杨()   

  1. 徐州工程学院环境工程学院,江苏 徐州 221018
  • 收稿日期:2023-02-06 修回日期:2023-03-20 出版日期:2023-10-25 发布日期:2023-11-30
  • 通讯作者: 张学杨
  • 作者简介:戴欢涛(2002—),男,本科生,研究方向为生物炭及环境治理技术。E-mail:daihuanta@163.com
  • 基金资助:
    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)

Adsorption properties of CO2 on pomelo peel biochar impregnated by lignin

DAI Huantao(), CAO Lingyu, YOU Xinxiu, XU Haoliang, WANG Tao, XIANG Wei, ZHANG Xueyang()   

  1. School of Environmental Engineering, Xuzhou Institute of Technology, Xuzhou 221018, Jiangsu, China
  • Received:2023-02-06 Revised:2023-03-20 Online:2023-10-25 Published:2023-11-30
  • Contact: ZHANG Xueyang

摘要:

吸附剂的孔隙结构在CO2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CO2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,CO2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CO2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CO2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%,CO2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CO2吸附剂。

关键词: 生物炭, 二氧化碳捕集, 木质素, 浸渍

Abstract:

The pore structure of adsorbent plays an important role in the process of CO2 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 CO2 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 CO2 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 CO2. The Avrami model and Langmuir model could well fit the adsorption process of CO2 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 CO2 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 CO2 adsorbent.

Key words: biochar, CO2 capture, lignin, impregnation

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