Abstract
The use of effective disposal of redundant pumpkin husk (PH) to remove pollutants is an important issue for environmental protection and utilization of resource. The aim of this study was to remove a potentially toxic reactive azo dye, Reactive Red (RR) 120, by widespread PH as a low-cost adsorbent. Particle size, adsorbent dose, pH, temperature, initial dye concentration, and contact time affected the sorption process. Amine, amide, hydroxyl, and carboxyl groups of PH played significant roles on the sorption process. Rapid sorption occurred within the first 2 min and equilibrium was reached within 60 min. Sorption kinetic was well represented by logistic equation. Generated secondary logistic model can be used to describe effects of initial dye concentration, contact time, and temperature by a single equation with high R 2 value. Monolayer sorption capacity was found as 98.61 mg g-1. Activation energy, thermodynamic, and desorption studies showed that this process was physical, endothermic, and spontaneous. This study indicated that redundant PH as a low-cost adsorbent had a great potential for the removal of RR 120 as an alternative eco-friendly process.
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The authors would like to thank the Scientific Research Projects Executive Councils of the University of Nevşehir and the University of Gaziantep and DPT (Turkey Prime Ministry State Planning Organization).
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Çelekli, A., Çelekli, F., Çiçek, E. et al. Predictive modeling of sorption and desorption of a reactive azo dye by pumpkin husk. Environ Sci Pollut Res 21, 5086–5097 (2014). https://doi.org/10.1007/s11356-013-2452-9
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DOI: https://doi.org/10.1007/s11356-013-2452-9