Adsorption properties of CO2 on pomelo peel biochar impregnated by lignin

被引：0

作者：

Dai H. ^{[1
]}

Cao L. ^{[1
]}

You X. ^{[1
]}

Xu H. ^{[1
]}

Wang T. ^{[1
]}

Xiang W. ^{[1
]}

Zhang X. ^{[1
]}

机构：

[1] School of Environmental Engineering, Xuzhou Institute of Technology, Jiangsu, Xuzhou

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2023年 / 42卷

关键词：

biochar; CO[!sub]2[!/sub] capture; impregnation; lignin;

D O I：

10.16085/j.issn.1000-6613.2023-0143

中图分类号：

学科分类号：

摘要：

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 CO2adsorption 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. © 2023 Chemical Industry Press. All rights reserved.

引用

页码：356 / 363

页数：7

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