Adsorption of CO2 by surface modified coal-based activated carbons: kinetic and thermodynamic analysis

IF 0.7 4区工程技术 Q4 CHEMISTRY, APPLIED

Polish Journal of Chemical Technology Pub Date : 2022-09-01 DOI:10.2478/pjct-2022-0018

Liu Xinzhe, Zhang Mingyang, C. Juan, H. Zhengyu, Xian Shuaifei, Tang Mingxuan, Zhang Chenchen

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引用次数: 1

Abstract

Abstract The effects of different surface modifiers on the CO2 adsorption capacity of coal-based activated carbons were studied, and the diffusion behavior, adsorption kinetics and thermodynamic parameters of CO2 in activated carbons were analyzed. The results show that compared with ethylene glycol, 1,2-propylenediamine and zinc chloride, potassium hydroxide and sodium hydroxide can greatly improve CO2 adsorption capacity. The adsorption rate is faster, and the adsorption capacity is larger, with the maximum CO2 adsorption capacity being 33.54 mL/g. Fick's law can well describe the diffusion behavior of CO2 in activated carbon. The addition of a surface modifier can increase the diffusion coefficient. The diffusion of CO2 in activated carbon falls into the category of crystal diffusion. The adsorption kinetics of CO2 before and after surface modification follow the Bangham equation. During the adsorption process, δ H < 0, δ G < 0, δ S < 0. Surface modification can reduce adsorption heat and promote adsorption, and the adsorption process is dominated by physisorption.

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表面改性煤基活性炭吸附CO2的动力学和热力学分析

摘要研究了不同表面改性剂对煤基活性炭吸附CO2能力的影响，分析了CO2在活性炭中的扩散行为、吸附动力学和热力学参数。结果表明，与乙二醇、1,2-乙二胺和氯化锌相比，氢氧化钾和氢氧化钠可以大大提高CO2的吸附能力。吸附速率较快，吸附容量较大，最大CO2吸附容量为33.54mL/g。Fick定律可以很好地描述CO2在活性炭中的扩散行为。添加表面改性剂可以增加扩散系数。CO2在活性炭中的扩散属于晶体扩散的范畴。表面改性前后CO2的吸附动力学遵循Bangham方程。在吸附过程中，δH<0，δG<0，ΔS<0。表面改性可以降低吸附热，促进吸附，吸附过程以物理吸附为主。

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来源期刊

Polish Journal of Chemical Technology CHEMISTRY, APPLIED-ENGINEERING, CHEMICAL

CiteScore

1.70

自引率

10.00%

发文量

审稿时长

4.5 months

期刊介绍： Polish Journal of Chemical Technology is a peer-reviewed, international journal devoted to fundamental and applied chemistry, as well as chemical engineering and biotechnology research. It has a very broad scope but favors interdisciplinary research that bring chemical technology together with other disciplines. All authors receive very fast and comprehensive peer-review. Additionally, every published article is promoted to researchers working in the same field.