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    • Keywords


      CO$_2$ adsorption; mesoporous silica; bimodal pore structure; amine modification.

    • Abstract


      This study established a method for preparing mesoporous silica (MS) with various pore structures from monomodal to bimodal by changing the starting materials ratio with the same method and materials. We examined the effect of the pore structure of the resulting samples on CO$_2$ adsorption properties after modification using various amine species with two modification methods (chemical or physical). MS samples were prepared by the co-condensation of two different silica precursors of tetraethylorthosilicate and polymethylhydrosiloxane (PMHS) using a templating agent of triblock copolymer, Pluronic P123. The results show that we succeeded in preparing three types of MS with different porestructures (one in monomodal and two in bimodal) by changing only the amount of PMHS. The results of CO$_2$ adsorption experiments indicated that although the amine-modified amount was highest for physical modification, because of severepore plugging, their CO$_2$ adsorption was not significant compared to chemically modified samples, which showed higher saturated CO$_2$ adsorption amount of 2.1 mmol g$^{-1}$ with very high amine utilization efficiency. In terms of pore structure,although the conventional monomodal MS, MCM-48, showed the highest saturated CO$_2$ adsorption amount due to high specific surface area, the plugging of the pores interferes with CO$_2$ diffusion. On the other hand, the larger pores in the MS samples prepared in this study both in monomodal and bimodal pore structure contributed to faster CO$_2$ diffusion.

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    • Author Affiliations



      1. Department of Environmental Engineering for Symbiosis, Faculty of Engineering, Soka University, Hachioji-shi 192-8577, Japan
      2. Science and Engineering for Sustainable Innovation, Faculty of Science and Engineering, Soka University, Hachioji-shi 192-8577, Japan
    • Dates

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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