Carbonised Agro-Waste Adsorbents for Automotive Lubricating Oil Removal
The increasing generation of waste lubricating oil, driven by expanding industrial and automotive activity, poses a significant threat to aquatic ecosystems due to its persistence, hydrophobicity, and complex chemical composition. This study evaluates two abundant agro-waste residue...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | en |
| Published: |
Penerbit UTHM
2025
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/51113/1/10.%2B24284%2B102-109%20%281%29.pdf http://ir.unimas.my/id/eprint/51113/ https://publisher.uthm.edu.my/ojs/index.php/jaita/article/view/24284/7718 https://doi.org/10.30880/jaita.2025.06.02.010 |
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| Summary: | The increasing generation of waste lubricating oil, driven by expanding industrial and automotive activity, poses a significant threat to aquatic ecosystems due to its persistence, hydrophobicity, and complex chemical composition. This study evaluates two abundant agro-waste residues: rice husk (RH) and sugarcane bagasse (SB) as potential adsorbents for lubricating oil removal. Both biomasses were pre-treated with 1M NaOH to enhance surface porosity and hydrophobicity, followed by carbonisation at 550 °C. Three adsorbent formulations were prepared based on RH:SB weight ratios of 24:6, 15:15, and 6:24 g. Batch experiments were conducted at oil concentrations of 25, 30, and 35 v/v% and contact times of 10, 20, and 30 min using a fixed 30g adsorbent dosage of RH and SB. The response behaviour was further examined using ANOVA and contour-plot analysis under Response Surface Methodology to interpret factor interactions. Optimum values for RH-SB adsorbent are 15:15 g of adsorbent dosage, 25 v/v% of oil concentration and 30 min of contact time. These resulted in 100% removal efficiency under controlled batch conditions. FTIR analysis confirmed the presence of lignocellulosic structures supporting oil–adsorbent interactions. Overall, the findings demonstrate that carbonised RH and SB are viable, low-cost, and environmentally sustainable adsorbents and are strongly recommended for removing used lubricating oil. |
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