Wante, Haruna P. and Yap, S. L. and Khan, A. A. and Chowdhury, Z. Z. and Nee, C. H. and Yap, S. S. (2024) Enhanced adsorption of malachite green (MG) dye using RF glow oxygen plasma-modified coconut carbon shell: A sustainable approach for effluent treatment. Diamond and Related Materials, 149. ISSN 0925-9635, DOI https://doi.org/10.1016/j.diamond.2024.111650.
Full text not available from this repository.Abstract
The textile industry produces dye pollutants that are both harmful and difficult to degrade. This study explores the enhanced adsorption of Malachite Green (MG) dye using coconut carbon shells treated with RF glow oxygen plasma discharge. Plasma treatment improved the surface properties of the adsorbent by introducing oxygencontaining functional groups and increasing surface polarity, which boosted dye adsorption through hydrogen bonding, electrostatic interactions, and it-it stacking. Experimental results revealed that a 10-minute plasma treatment optimally enhanced adsorption capacity by 39 % compared to untreated samples. The Langmuir isotherm model demonstrated a maximum adsorption capacity (qm) of 161 mg/g, surpassing the Freundlich model. At pH 8, using 0.2 g of adsorbent in 50 mL solutions with initial dye concentrations of 25 mg/L and 100 mg/L, the 10-minute plasma-treated samples achieved adsorption capacities of 6.01 mg/g and 23.95 mg/g, respectively, compared to 4.72 mg/g and 17.2 mg/g for the untreated samples. This corresponded to removal efficiencies of 96.12 % and 95.8 % for the treated samples, and 75.6 % and 68.8 % for the untreated samples, after 80 min of contact at 200 rpm. UV-vis spectrophotometry confirmed the reduction in dye concentration after adsorption. FE-SEM analysis revealed that plasma treatment created micro-pores on the coconut carbon shell, enhancing adsorption capacity, while SEM-EDX analysis showed increased oxygen content after 10 min of treatment. FTIR analysis identified additional carbonyl (-C=O) and hydroxyl (-OH) groups, indicating the incorporation of oxygen-containing functional groups due to plasma treatment. Confocal Raman microscopy was also used to analyze the microstructural changes in the samples.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Education, Malaysia [Grant No: TRGS/1/2020/UM/02/2/3] |
| Uncontrolled Keywords: | RF glow discharge; Oxidation; Adsorption; Coconut carbon shell; Plasma treatment |
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 03 Nov 2025 08:03 |
| Last Modified: | 03 Nov 2025 08:03 |
| URI: | http://eprints.um.edu.my/id/eprint/46360 |
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