Role of additives in silica-supported polyethylenimine adsorbents for CO2 adsorption

Author:

Fang Qianxi,Huang WeiqiuORCID,Wang Hongning

Abstract

Abstract SiO2 aerogels were prepared by sol-gel method and methyl alkylation reaction using TEOS as silicon sources. Silica-supported polyethylenimine (PEI/SiO2) adsorbents for CO2 adsorption were prepare by grafting techniques, in which mesoporous SiO2 aerogel was loaded with PEI and organic compounds functionalized by hydroxyl or amino groups as dopants. CO2 adsorption isotherms of PEI amine-modified SiO2 aerogels were measured and the results show that the maximum CO2 adsorption capacity (1.8 mmol g−1) was obtained over a doped SA-PEI-N-Y loaded with 45% PEI and 15% N-Y (N-[3-(Trimethoxysilyl)propyl]ethylenediamine, denoted as N-Y). In addition, SA-PEI-N-Y has stronger thermal stability than SA-PEI-60% in nitrogen from room temperature to 800 °C at a heating rate of 10 °C min−1. It turns out that N-[3-(Trimethoxysilyl)propyl]ethylenediamine is the best dopant.

Funder

Joint Open Fund of Jiangsu Collaborative Innovation Center for Ecological Building Material and Environmental Protection Equipments

Key Research and Development Program of Jiangsu Province

Postgraduate Research & Practice Innovation Program of Jiangsu Province

Publisher

IOP Publishing

Subject

Metals and Alloys,Polymers and Plastics,Surfaces, Coatings and Films,Biomaterials,Electronic, Optical and Magnetic Materials

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