article · Journal of Saudi Chemical Society
This research investigates the use of activated carbon derived from coffee ground pyrolysis as an affordable, natural adsorbent to remove methylene blue dye from water. Using a three-factor Box-Behnken design within response surface methodology, the adsorption process was evaluated across varying pH levels, initial dye concentrations, and adsorbent doses. The analysis established a mathematical model capturing how these operational factors and their interactions influence dye removal. Testing demonstrated that initial dye concentration and adsorbent mass significantly affected the decoloration process. Under optimal conditions of 0.05 grams per litre of adsorbent, 100 milligrams per litre of dye concentration, and a pH of 2.5, the process achieved a 91 percent dye degradation efficiency. The findings confirm that activated carbon derived from coffee grounds offers high efficiency for removing textile dyes from aqueous solutions.
Discharging synthetic dyes from industries such as textile manufacturing creates significant water pollution challenges. Transforming spent coffee grounds into activated carbon provides a low-cost, waste-derived material to clean contaminated water. Demonstrating that agricultural by-products can efficiently strip hazardous colourants from aqueous solutions offers an accessible approach to wastewater remediation.
The findings could enable textile manufacturers and industrial wastewater operators to treat dye-laden effluents using a low-cost, bio-based adsorbent. The research appears to be early-stage laboratory experimentation, focusing on bench-scale parameter optimisation rather than pilot-scale or full-scale industrial validation. Further development and scaling would be needed before practical industrial deployment.
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This study aimed to examine the impact of operational factors on the adsorption capacity of methylene blue (MB) using a natural and cost-effective adsorbent, activated carbon from coffee grounds (CAP). The three-factor Box-Behnken design of the response surface methodology (RSM) was employed to optimize this economically viable process with maximum efficiency. Through extensive experiments, the factors influencing the adsorption process were identified, their interactions were measured, and a mathematical model was developed. The experiment evaluated the quantity of MB adsorbed by CAP based on pH (2.5 - 10), initial MB concentration (10 - 100 mg/L), and CAP adsorbent amount (0.05 - 0.1 g/L). The results revealed that both concentration and mass significantly influenced the decoloration enhancement. Optimal conditions for achieving a 91 % degradation efficiency were determined as 0.05 g/L adsorbent weight, 100 mg/L dye concentration, and pH 2.5, with a desirability score of approximately 0.986, aligning closely with the predictions of the BBD model. In conclusion, this research addresses a research gap by demonstrating the high effectiveness of the CAP adsorbent in removing dyes from textiles.
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DOI: 10.1016/j.jscs.2023.101695
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