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Kinetics and Mechanisms Study of Congo red, Eosin B and Neutral red Adsorption from Aqueous Solutions on Kaolin | ||
| Iraqi National Journal Of Chemistry | ||
| Article 1, Volume 0, Issue 32, 2014, Pages 637-647 | ||
| Authors | ||
| Saja S. Jabbar Al-Taweel; Laith S. Jassim; Haider M. Hassoon | ||
| Abstract | ||
| Abstract In this study, kaolin clay was used as the adsorbent for the removal of congo red, eosin B and neutral red from aqueous solutions. The effect of contact time was investigated and found that the adsorption process of dyes on kaolin surface was reached complete equilibrium within 60 min The maximum uptake of congo red, eosin B and neutral red by kaolin clay were found to be 65.7%, 89.7% and 97.9%, respectively. The kinetic data were well fitted to the lagergren, pseudo-second order models. The results obtained show that the second order rate constants of eosin – kaolin and neutral red – kaolin systems are much higher than that of congo red – kaolin system. This behavior was discussed depending on the chemical structure of dyes and kaolin surface. The kinetics of dyes adsorption was also studied in terms of intraparticle diffusion model. The results indicated that intraparticle diffusion plays a significant role in the adsorption mechanism. | ||
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