Abstract
The disposal of spent coffee grounds (SCG) in landfills is a common practice. However, owing to their unique porous structure, SCGs can be transformed into biochar for use as a cost-effective adsorbent. Methylene blue (MB), a dye employed in textile and printing sectors, poses risks to both aquatic life and human health. To mitigate these effects, efficient treatment of MB prior to environmental release is essential. This research assesses the suitability of spent coffee ground biochar (SCGB) as an adsorbent for MB. The design of experiment (DOE) employed two approaches, classical and response surface optimization, considering adsorbent dosage, solution pH, contact time, temperature, and MB removal percentage as factors. Notably, adsorbent dosage and temperature emerged as critical factors for MB removal, with a well-fitting linear model. The optimum conditions for MB removal by SCGB were 0.99 g adsorbent, 30 min contact time, 30°C, and pH 7. The predicted MB removal was 99.99%, with a desirability of 1.000. The 0.02% discrepancy between predicted and experimental values confirmed the accuracy of the experimental parameter prediction by DOE. SCGB demonstrated robust adsorption capacity, attributed to its carbonaceous and highly porous structure, leading to significantly enhanced MB removal efficiency.
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