Sains Malaysiana 48(5)(2019): 1025–1033

http://dx.doi.org/10.17576/jsm-2019-4805-11

 

Immobilization of Choline Chloride: Urea onto Mesoporous Silica for Carbon Dioxide Capture

(Pemegunan Kolina Klorida: Urea ke atas Silika Mesoliang untuk Penangkapan Karbon Dioksida)

 

ZAITUN GHAZALI^1,2, NUR HASYAREEDA HASSAN^1,2, MOHD AMBAR YARMO^1,3, TEH LEE PENG^1,3 & RIZAFIZAH OTHAMAN^1,2*

 

¹School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

²Polymer Research Center, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

³Catalyst Research Group, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Diserahkan: 7 Februari 2019/Diterima: 28 Mac 2019

 

ABSTRACT

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.

 

Keywords: Adsorption; carbon capture; choline chloride; deep eutectic solvent; silica gel; urea

 

ABSTRAK

Penjerap komposit hijau berasaskan gel silika mesoliang (SG) dan pelarut eutektik dalam (DES) kolona klorida-urea (ChCl:U) disintesis untuk penjerapan karbon dioksida (CO2). Penjerap komposit telah disediakan dengan teknik penjejalan basah dengan muatan 5-15% (b/b) ChCl:U (nisbah mol 1:2). Spektrum inframerah transformasi Fourier-pantulan penuh kecil (ATR-FTIR) membuktikan bahawa ChCl:U telah berjaya dijejalkan ke atas SG dengan kehadiran puncak regangan kumpulan karbonil amida C=O , bengkokan N-H , bengkokan CH2 dan regangan C-N. Suhu degradasi penjerap bermula dengan urea pada 130°C diikuti oleh ChCl pada 300°C. Analisis penjerapan fizikal nitrogen menunjukkan penurunan luas permukaan dengan peningkatan peratus berat ChCl:U disebabkan mikroliang yang dilitupi oleh ChCl:U. Kapasiti penjerapan CO2 yang optimum (22.3 mg/g) tercapai dengan menggunakan 10% ChCl:U/SG200 dengan kapasiti penjerapannya lebih tinggi berbanding SG200 tanpa pemegunan,. Ini menjadikannya penjerap hijau yang ekonomi untuk penangkapan CO2.

 

Kata kunci: Gel silika; kolina klorida; pelarut eutektik dalam; penangkapan karbon; penjerapan; urea

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*Pengarang untuk surat-menyurat; email: rizafizah@ukm.edu.my