Study on the adsorption of Cd(II) in aqueous solution onto biochar materials synthesized from rice husk via microwave-assisted pyrolysis method

Thi-Ngoc-Linh Huynh; Ngoc-An Nguyen; Duy-Khoi Nguyen; Phuong-Thao Huynh; Anh-Duc Trinh; Van-Phuc Dinh

doi:10.62239/jca.2025.017

Authors

Thi-Ngoc-Linh Huynh Can Tho Department of Science and Technology, Can Tho City
Ngoc-An Nguyen Institute of Interdisciplinary Social Sciences, Nguyen Tat Thanh University
Duy-Khoi Nguyen Institute of Interdisciplinary Social Sciences, Nguyen Tat Thanh University
Phuong-Thao Huynh Faculty of Chemistry and Environment, Dalat University
Trinh Anh Duc Nuclear Training Center, Vietnam Atomic Energy Institute
Van-Phuc Dinh Nguyen Tat Thanh University

DOI:

https://doi.org/10.62239/jca.2025.017

Keywords:

Rice husk, Biochar, Microwave-assisted pyrolysis, Cd(II) adsorption, Isotherm models

Abstract

Biochar materials from rice husk were successfully synthesized using the microwave-assisted pyrolysis (MAP) method, and subsequently applied for the adsorption of Cd(II) ions in aqueous solution. The characteristics of the materials were analyzed using different methods. The factors influencing the adsorption process were investigated, including pH, time, concentration, and temperature. 03 isotherm models composed of: Langmuir, Freundlich, Sips models were utilized to study the isotherm properties of the adsorption process. The results demonstrate that the biochar material synthesized via the MAP method exhibits high porosity (surface area = 270 m²/g, with an average pore size of approximately 5.1 nm). This material is capable of adsorbing Cd(II) ions from aqueous solutions optimally at pH 5.0, with an adsorption equilibrium time of 180 mins. The maximum adsorption capacity calculated from the Langmuir model at 307 K is 6.22 mg/g.

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