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Investigation of the competitive adsorption mechanism between typical volatile organic compounds (VOCs) and water vapor in waste gas emissions from the fermentation industry

文献类型： 外文期刊

作者： Yao, Xiaolong 1 ; Liang, Xinyue 1 ; Shi, Yue 1 ; Zhou, Jingya 1 ; Gong, Wenwen 4 ; Bu, Qingwei 3 ;

作者机构： 1.Beijing Technol & Business Univ, Sch Ecol & Environm, 11 Fuchen Rd, Beijing 100048, Peoples R China

2.Beijing Technol & Business Univ, State Environm Protect Key Lab Food Chain Pollut C, Beijing, Peoples R China

3.China Univ Min & Technol Beijing, Sch Chem & Environm Engn, Beijing, Peoples R China

4.Beijing Acad Agr & Forestry Sci, Inst Qual Stand & Testing Technol, Beijing, Peoples R China

关键词： Water vapor; adsorption; volatile organic compounds; activated carbon

期刊名称：SEPARATION SCIENCE AND TECHNOLOGY （ 影响因子：2.3； 五年影响因子：2.3 ）

ISSN： 0149-6395

年卷期： 2025 年 60 卷 3-5 期

页码：

收录情况： SCI

摘要： The fermentation waste gas, characterized by high humidity and diverse volatile organic compounds (VOCs), poses challenges for adsorption in activated carbon devices. In this study, starch-based activated carbon was used as an adsorbent, targeting typical VOCs from fermentation industries-methyl mercaptan, toluene, and n-hexane. The adsorption behavior of water vapor and VOCs on the carbon interface was analyzed through adsorption experiments, structure characterization, and molecular simulations. Results showed that at 70% RH, the adsorption capacities of toluene and n-hexane experienced a reduction of 42.15% and 59.24% respectively compared to their respective capacities without water vapor at the breakthrough moment, while methyl mercaptan's capacity increased by 32.29% due to dissolution in condensed water within micropores. Water displaced all three VOCs during multicomponent adsorption. Reducing surface carboxyl groups, pyrrolic-N, and pyridinic-N enhances selective adsorption of VOCs. Among the VOCs, toluene shows the strongest interaction with activated carbon, followed by n-hexane and then methyl mercaptan. However, a water film under high humidity hinders the adsorption of n-hexane and toluene, reducing selectivity. These research findings will contribute to a comprehensive understanding of the mechanisms underlying the absorption of VOCs in high humidity environments by activated carbon.

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