Immobilization of choline chloride: urea onto mesoporous silica for carbon dioxide capture

Zaitun Ghazali, and Nur Hasyareeda Hassan, and Mohd Ambar Yarmo, and Teh, Lee Peng and Rizafizah Othaman, (2019) Immobilization of choline chloride: urea onto mesoporous silica for carbon dioxide capture. Sains Malaysiana, 48 (5). pp. 1025-1033. ISSN 0126-6039


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A green composite adsorbent based on mesoporous silica-gel (SG) and deep eutectic solvent (DES) mixture of choline chloride-urea (ChCl:U) was synthesized as an alternative for carbon dioxide (CO2) adsorption. The composite adsorbent was prepared by wet impregnation technique with various ChCl:U (mole ratio 1:2) content in SG at 5-15% (w/w). Fourier transform infrared attenuated total reflectance (ATR-FTIR) results showed successful impregnation of ChCl:U into SG with the presence of C=O carbonyl amide group stretching, N-H scissoring bending, CH2 bending and C-N stretching peaks. Thermal degradation of the adsorbent started with urea at 130°C followed by ChCl at 300°C. Meanwhile, nitrogen physisorption demonstrated a decrease in specific surface areas of the sorbents with increasing ChCl:U weight percentage due to the blockage of micropores by ChCl:U. The optimum CO2 adsorption capacity of 22.3 mg/g was achieved by 10%ChCl:U/SG200, which was higher than the immobilised SG200, hence making it relevant to become a green and economical adsorbent for CO2 capture.

Item Type:Article
Keywords:Adsorption; Carbon capture; Choline chloride; Deep eutectic solvent; Silica gel; Urea
Journal:Sains Malaysiana
ID Code:13624
Deposited By: ms aida -
Deposited On:06 Nov 2019 06:25
Last Modified:10 Nov 2019 04:06

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