تقييم مقارن لكفاءة مواد مازة محضرة من نوى التمر ونوى الزيتون في إزالة الأصباغ من المحاليل المائية
DOI:
https://doi.org/10.65405/pd3y2a23Keywords:
Date pits; Olive stones; Dye adsorption; Methylene blue; Methyl orange; Adsorbent reuse.Abstract
This study compared the performance of adsorbents prepared from date pits (DP) and olive stones (OS) for removing methylene blue (MB) and methyl orange (MO) from single-dye aqueous solutions. Batch experiments examined the effects of initial pH, adsorbent dosage, contact time, initial dye concentration, temperature, sodium chloride addition, and reuse. Residual dye concentrations were determined by UV–visible spectrophotometry, and kinetic and equilibrium data were analyzed using nonlinear regression. At an initial dye concentration of 20 mg/L, an adsorbent dosage of 1 g/L, initial pH 7, 25 °C, and a contact time of 24 h, MB removal reached 82.97% with DP and 74.68% with OS, whereas MO removal reached 46.74% and 58.80%, respectively. The pseudo-second-order equation fitted the kinetic data better than the pseudo-first-order equation, while the Langmuir isotherm provided a better fit than the Freundlich isotherm. Maximum adsorption capacities estimated using the Langmuir equation were 69.73 and 57.00 mg/g for MB and 29.65 and 37.52 mg/g for MO using DP and OS, respectively. Increasing dosage improved removal but reduced adsorption per unit adsorbent mass. Higher temperatures modestly improved removal, whereas adding 50 mmol/L sodium chloride reduced removal compared with no salt addition. After five cycles, DP retained 84.19% of its initial MB removal efficiency, while OS retained 69.47% for MO. These findings support selecting DP for MB and OS for MO under the conditions studied.
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References
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