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Adsorption and Separation of Carbon Dioxide/Methane in Landfill Gas with Barium Ion–Modified Silica Gel

  • Research Article-Chemical Engineering
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Abstract

Environmental issues caused by greenhouse gases are becoming more and more severe. The main components of landfill gas, carbon dioxide (CO2) and methane (CH4), are greenhouse gases, and the separation and recovery of them are a popular research topic. In order to improve the adsorption capacity of the silica gel adsorbent for landfill gas, a method such as modify silica gel with alkali metal ions is often used. It is to improve the selective adsorption capacity of CO2 by adjusting the polarizability and charge distribution of the silica gel surface while improving the separation effect of the mixed gas. In this study, the adsorption performance of a silica gel adsorbent modified or not with alkali metal ions was measured in terms of the adsorption and separation of a CO2/CH4 mixture (simulating landfill gas). The N2 adsorption and desorption curve of the silica gel adsorbent at 77 K was plotted by determining the specific surface area and pore-size distribution. The results indicated that the unmodified silica gel adsorbent had a large micropore volume and specific surface area and exhibited a high capacity to adsorb gas. After potassium chloride, calcium chloride, magnesium chloride, or barium chloride solution was used to modify the silica gel adsorbent, the adsorption performance of the modified silica gels was ranked as barium chloride > potassium chloride > calcium chloride > magnesium chloride. The best-performing concentration of barium chloride solution was 0.1 mol/L. The research results will provide certain reference for the fields of chemistry and environmental science.

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Availability of Data and Materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This research was sponsored by the Fundamental Research Funds for the Central Universities (Project No. 2019CDCGHJ325).

Funding

This research was supported by the Fundamental Research Funds for the Central Universities (Project No. 2019CDCGHJ325).

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Author notes

  1. Yin Cheng and Kejin Chen have contributed equally to this work.

Authors and Affiliations

  1. Chongqing Water Assets Management Co., Ltd., Chongqing, China

    Yin Cheng, Cheng Zhong, Chao Lv, Li Li & Fanghua Yu

  2. College of Environment and Ecology, Chongqing University, Chongqing, China

    Kejin Chen & Li’ao Wang

  3. Chongqing Sanfeng Science and Technology Co., Ltd., Chongqing, China

    Xiaohua Wang

  4. Chognqing Drainage Co., Ltd., Chongqing, China

    Maoqian Ran

  5. Baihan Sewage Treatment Co, Ltd, Chongqing, China

    Fan Xu

Authors
  1. Yin Cheng
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  2. Kejin Chen
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  3. Cheng Zhong
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  4. Chao Lv
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  5. Li Li
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Contributions

YC, KJC: preparation, creation and/or presentation of the published work, specifically writing the initial draft (including substantive translation). CZ, CL: ideas; formulation or evolution of overarching research goals and aims. LL, FY, XHW: application of statistical, mathematical, computational, or other formal techniques to analyze or synthesize study data. MQR, FX: Ideas; formulation or evolution of overarching research goals and aims. LAW: preparation, creation and/or presentation of the published work by those from the original research group, specifically critical review, commentary or revision—including pre- or post-publication stages.

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Correspondence to Li’ao Wang.

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Cheng, Y., Chen, K., Zhong, C. et al. Adsorption and Separation of Carbon Dioxide/Methane in Landfill Gas with Barium Ion–Modified Silica Gel. Arab J Sci Eng 47, 5491–5500 (2022). https://doi.org/10.1007/s13369-021-05454-5

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  • DOI: https://doi.org/10.1007/s13369-021-05454-5

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