Utilizing red Iraqi kaolin for methylene blue sorption from aqueous solutions
DOI:
https://doi.org/10.31699/IJCPE.2025.3.8Keywords:
Methylene blue; Iraqi kaolin; sorption; wastewater treatment; kinetic modeling; and sorption isothermsAbstract
This paper explores the sorption potential of red Iraqi kaolin (IRK) for methylene blue (MB) elimination by sorption process. Batch tests were examined the impact of agitation time, IRK dose, pH, shaking speed, and MB concentration. The results demonstrated that IRK effectively removes MB, achieving a maximum elimination efficiency of 91.976% within 0.05 g/100 mL, 120 min, 7, 200 rpm and 50 mg/L for IRK dosage, contact duration, pH, shaking speed, and concentration of MB, respectively. The kinetic analysis showed that the sorption mechanism was fitted a pseudo 2nd order, therefore chemisorption is the primary mechanism. Intra-particle diffusion investigation demonstrated that the sorption mechanism is influenced by many concurrent procedures, particularly surface complexation and ion exchange. In addition, the Freundlich isotherm model fits the experiment's measurement higher than the Langmuir model, showing the heterogeneous surface features of IRK and the maximum sorption capacity (qmax) equal to 587.08 mg/g. The current investigation demonstrates the possibility of IRK as an effective and inexpensive sorbent for wastewater treatment applications, opening up opportunities for further research into sorbent regeneration and real-world wastewater situations.
Received on 15/11/2024
Received in Revised Form on 11/01/2025
Accepted on 12/01/2025
Published on 30/09/2025
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