Anomalous enhancement of humid CO2 capture by local surface bound water in polar carbon nanopores

Zhe Zheng, Yong-Sheng Wang, Miao Wang, Guo-Hua Zhao, Guang-Ping Hao () and An-Hui Lu ()
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Zhe Zheng: Dalian University of Technology
Yong-Sheng Wang: Dalian University of Technology
Miao Wang: Dalian University of Technology
Guo-Hua Zhao: Dalian University of Technology
Guang-Ping Hao: Dalian University of Technology
An-Hui Lu: Dalian University of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Removal of confined space carbon dioxide (CO2) that is in low concentration and with coexisting water is necessary but challenging by physical adsorption method. To make the removal process effective, rendering the nanopore surface hydrophobic to resist water is the popular way. Instead of preventing water from occupying the nanopores, in this work, we propose to utilize the guest water for the spatially selective formation of local surface bound water and further induce the preferential CO2 capture. We observe an anomalous enhancement of CO2 capture performance under humid conditions over carbon nanopores with spatially selective polar sites. It is evidenced that the surface bound water is formed at non-CO2-selective areas of polar carbon nanopores, thus creating additional CO2 trapping sites. This work may inspire the design of environment tolerable materials for molecular separation and purification under harsh conditions.

Date: 2024
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DOI: 10.1038/s41467-024-53367-2

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