Sains Malaysiana 52(1)(2023): 129-138

http://doi.org/10.17576/jsm-2023-5201-10

 

Adsorption Isotherm and Surface Analysis for the Carbonate Formation on Nano Coral-Shaped Iron(Iii) Oxide

(Isoterma Penjerapan dan Analisis Permukaan bagi Pembentukan Karbonat di atas Ferum(Iii) Oksida Berbentuk Karang Nano)

 

AZIZUL HAKIM LAHURI1,*, MOHD AMBAR YARMO2, NORAZZIZI NORDIN3, NORLIZA DZAKARIA4, ADELINE HWONG ING ING5 & SOPHIA JELINA STANLEY KUDA5

 

1Department of Science and Technology, Universiti Putra Malaysia Bintulu Kampus, Nyabau Road, P.O Box 396, 97008 Bintulu, Sarawak, Malaysia

2Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

3School of Chemical Sciences, Universiti Sains Malaysia, 11800 Gelugor, Pulau Pinang, Malaysia

4School of Chemistry and Environment, Faculty of Applied Sciences, Universiti Teknologi MARA, Cawangan Negeri Sembilan, Kampus Kuala Pilah, Pekan Parit Tinggi, 72000 Kuala Pilah, Negeri Sembilan Darul Khusus, Malaysia

5Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia

 

Received: 22 March 2022/Accepted: 25 June 2022

 

Abstract

The α-Fe2O3 was synthesized using the hydrolysis method to obtain the nano coral-shaped morphology. The adsorption isotherm and surface analysis upon CO2 adsorption were identified. The adsorption capacity for nano coral-shaped α-Fe2O3 was measured at 8.66 cm3/g (17.00 mg/g). Experimental data from CO2 adsorption isotherm at 25 ℃ best fits with the Freundlich isotherm model which implies the adsorption process is favorable and the multilayer adsorption on the heterogeneous surface. A decrease in the α-Fe2O3 crystallite peaks in the X-ray diffractogram after the CO2adsorption was associated with the carbonate complexes species formation. IR spectra indicate higher intensities over the CO2 exposure time of 4, 12 and 24 h, especially at absorption bands 1041 and 1627 cm-1 that corresponded to C-O and asymmetry O-C-O stretches, respectively, for carbonate. The morphology of the carbonate formation on nano coral-shaped α-Fe2O3 over the CO2 exposure time was analyzed using FESEM-EDX. Although the carbonate formation was not distinct, the increment in the C element also confirmed the capability of the α-Fe2O3 in adsorbing CO2 for a long adsorption time of 24 h.

 

Keywords: Adsorption isotherm; carbonate formation; CO2 capture; hydrolysis method; iron(III) oxide

 

Abstrak

α-Fe2O3 telah disintesis menggunakan kaedah hidrolisis untuk mendapatkan morfologi berbentuk nano karang. Isoterma penjerapan dan analisis permukaan terhadap penjerapan CO2 telah dikenal pasti. Keupayaan penjerapan bagi α-Fe2O3 berbentuk nano karang telah diperoleh sebanyak 8.66 cm3/g (17.00 mg/g). Isoterma penjerapan CO2 pada 25 ℃ daripada data uji kaji paling sesuai dengan model isoterma Freundlich menunjukkan proses penjerapan adalah berlaku dengan mudah dan penjerapan lapisan berganda pada permukaan yang heterogen. Penurunan puncak kekisi α-Fe2O3 dalam difraktogram sinar X selepas penjerapan CO2 adalah dikaitkan dengan pembentukan spesies karbonat kompleks. Spektrum IR menunjukkan keamatan yang lebih tinggi terhadap masa pendedahan CO2 pada 4, 12 dan 24 jam, terutamanya pada jalur-jalur serapan bagi 1041 dan 1627 cm-1 yang masing-masing sepadan dengan regangan C-O dan O-C-O tak simetri bagi karbonat. Morfologi bagi pembentukan karbonat di atas α-Fe2O3 berbentuk nano karang terhadap masa pendedahan CO2 dianalisis menggunakan FESEM-EDX. Walaupun pembentukan karbonat adalah tidak jelas, peningkatan unsur C juga telah mengesahkan keupayaan α-Fe2O3 dalam menjerap CO2 dalam masa penjerapan yang panjang pada 24 jam.

 

Kata kunci: Ferum(III) oksida; isoterma penjerapan; kaedah hidrolisis; pembentukan karbonat; penjerapan CO2

 

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*Corresponding author; email: azizulhakim@upm.edu.my

 

 

 

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