Enhanced adsorption of carbon dioxide by phosphoric acid-modified soybean curd residue biochar

Zakaria, Dina Sofiea and Mahmad Rozi, Siti Khalijah and Abdul Halim, Hairul Nazirah and Mohamad, Sharifah and Mat Hussin, Siti Amira (2022) Enhanced adsorption of carbon dioxide by phosphoric acid-modified soybean curd residue biochar. Malaysian Journal of Chemistry, 24 (2). 207 – 214. ISSN 15112292,

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Biochar is being increasingly applied for carbon dioxide (CO2) capture to preserve environmental quality. The use of soybean waste, soybean curd residue (SCR) as CO2 adsorbents can help to reduce the uncontrolled disposal of SCR. In this research, SCR-based biochar (Biochar@SCR) was prepared by pyrolysis process. For chemical activation, Biochar@SCR was immersed for 12 hours in 42.5 wt. H3PO4 solution at 1:1 ratio (g precursor/g H3PO4) to obtain Biochar@SCR-M1. Biochar@SCR-M2 was produced when Biochar@SCR-M1 was pyrolyzed again at 5000C for 2 hours. Elemental and functional groups analyses showed the presence of elemental phosphorus (P) and functional groups of P=O or P=OOH for Biochar@SCR-M1 and Biochar@SCR-M2, suggesting the chemical modification using H3PO4 was successful. Morphological analysis revealed the formation of pores after the pyrolysis process and chemical treatment with H3PO4. Analysis of CO2 adsorption depicted that the adsorption capacities of SCR, Biochar@SCR, Biochar@SCR-M1, and Biochar@SCR-M2 were 3.00 mg/g, 25.21 mg/g, 30.50 mg/g, and 36.00 mg/g, respectively. This result proved the increased CO2 sorption for H3PO4-treated Biochar@SCR, suggesting that phosphoric acid modification is an effective method for preparing biochar with high carbon dioxide adsorption. © 2022 Malaysian Institute of Chemistry. All rights reserved.

Item Type: Article
Funders: None
Uncontrolled Keywords: Biochar; Carbon dioxide; Phosphoric acid; Pyrolysis; Soybean curd residue
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science > Department of Chemistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 26 Oct 2023 03:35
Last Modified: 26 Oct 2023 03:36
URI: http://eprints.um.edu.my/id/eprint/43616

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