Abstract
Pumpkin seed husks were used in this research as effective-cost material for the adsorption of Solochrome cyanine R from aqueous solutions. A good removal ability of Pumpkin seed husks was noticed during this study, and the optimal adsorption conditions were found to be 120 min. equilibrium contact time, 0.2 g biosorbent dosage, and 100 mg/L initial dye concentration. The kinetic investigation shows that applying the pseudo-second order model gives a better fit for the adsorption with the higher correlation coefficient. The isothermal investigation shows an excellent fit of data using the Langmuir model, and also predict that the removal process is favorable. The adsorption data at different temperatures were evaluated in order to obtain the thermodynamic parameters. The positive values of ΔH° and ΔS° indicate the endothermic and randomness of the adsorption process. Moreover, the negative values of ΔG° clarify that the adsorption process is spontaneous and more preferable at higher temperatures. Pumpkin seed husks as a low-cost biosorbent exhibit a great potential for the adsorption of Solochrome cyanine R from aqueous solutions.
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