Malaysian Journal of Analytical Sciences Vol 21 No 4 (2017): 921 - 927

DOI: https://doi.org/10.17576/mjas-2017-2104-19

 

 

 

CARBON DIOXIDE SORPTION BY TETRADECYLAMINE SUPPORTED ON SILICA GEL

 

(Serapan Karbon Dioksida Oleh Tetradesilamina Disokong Pada Silika Gel)

 

Maratun Najiha Abu Tahari¹*, Azizul Hakim¹, Tengku Sharifah Marliza², Mohd. Ambar Yarmo¹

 

¹School of Chemical Science and Food Technology, Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

²Catalysis Science and Technology Research Centre, Faculty of Science,

Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

 

*Corresponding author: maratunnajiha@gmail.com

 

 

Received: 28 November 2016; Accepted: 27 April 2017

 

 

Abstract

Carbon dioxide emissions generated from fossil fuel-based power plants and other industries has reached 400 ppm in atmosphere. This negatively impact the environment, infrastructures and wildlife in particular. A lot of efforts are needed to produce CO₂ gas sorbent in order to reduce high CO₂ concentration. Therefore, porous silica gel (SG) is modified with amine compound for carbon dioxide capture. Calcinated silica gel functionalized with tetradecylamine (TDA) using wet impregnation has been developed as a porous media. The prepared sorbents is characterized by N₂ physisorption technique Brunauer-Emmet-Teller analysis (BET). Significant changes in physical properties of the sorbents further ascertained the dispersion of TDA on the internal channels and external surface of the SG. Reactivity of porous sorbent towards CO₂ was evaluated using isothermal CO₂ adsorption desorption technique. This study shows 65TDA/SG enable to adsorb CO₂ in the highest capacity which is 23.22 cm³ CO₂ per gram sorbent. Moreover, CO₂ capture consists of two type sorption which are physisorption and chemisorption. 55TDA/SG is the best sorbent in capturing CO₂ by chemisorption (19.62 cm³ CO₂ per gram adsorbent).

 

Keywords:  tetradecylamine, modified silica gel, carbon dioxide_, chemisorption, physisorption

 

Abstrak

Pembebasan karbon dioksida terhasil daripada plan penghasilan tenaga berasaskan bahan api fosil dan pelbagai industri telah mencecah kepekatan 400 ppm di atmosfera. Perkara ini memberi kesan negatif kepada alam sekitar, infrastruktur dan kehidupan liar khasnya. Pelbagai usaha diperlukan untuk menghasilkan penjerap gas CO₂ dalam usaha untuk merendahkan kepekatan CO₂ yang semakin meningkat ini. Oleh itu, silika gel berliang (SG) telah di ubahsuai dengan sebatian amina untuk pemerangkapan karbon dioksida. Silika gel yang telah dikalsin akan difungsikan dengan teteradesilamina (TDA) menggunakan kaedah impregnasi basah telah dibangunkan sebagai media berliang. Penjerap yang dihasilkan akan dicirikan dengan teknik jerapan fizikal N₂ iaitu analisis Brunauer-Emmet-Teller (BET). Perubahan ciri fizikal yang ketara pada penjerap mengukuhkan lagi sebaran TDA pada permukaan dalam liang dan juga permukaan luaran SG. Kereaktifan penjerap berliang terhadap CO₂ telah dinilai menggunakan teknik penjerapan dan penyahjerapan isoterma CO₂. Hasil kajian ini menunjukkan bahawa 65TDA/SG mampu menjerap CO₂ dalam kapasiti yang tertinggi sebanyak 23.22 cm³ CO₂ per gram penjerap. Tambahan, pemerangkapan CO₂ terdiri daripada dua jenis serapan iaitu serapan fizikal dan jerapan kimia. Penjerap 55TDA/SG adalah penjerap terbaik dalam pemerangkapan CO₂ secara jerapan kimia (19.62 cm³ CO₂ per gram penjerap).

 

Kata kunci:  tetradesilamina, SG di ubahsuai, karbon dioksida_, jerapan kimia, serapan fizikal

 

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