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Cadmium removal from aqueous solutions by pumice and nano-pumice
Sara Haddadi Khorzughy,Teymur Eslamkish,Faramarz Doulati Ardejani,Mohammad Reza Heydartaemeh 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
Use of low-cost minerals to eliminate mining and industrial pollutants is the main goal of this study. Weinvestigated the ability of pumice and nano-pumice to remove cadmium from a synthetic aqueous solution. Batchexperiments were performed to investigate adsorption characteristic; therefore, the effective factors influencing theadsorption process including solution pH, contact time and initial concentration have been considered. Equilibriumdata were attempted by Langmuir and Freundlich isotherm models to realize the interaction between adsorbent andadsorbate. The results show that cadmium adsorption on Pumice follows the Langmuir isotherm model with a R2of0.9996 and shows a homogeneous and mono-layer adsorption. Whereas, cadmium adsorption on nano-Pumice fol-lows a Freundlich model (R2=0.9939) and exhibits a multi-layer adsorption. The maximum mono-layer capacity (qmax)of cadmium for pumice and nano-pumice was calculated 26 and 200mg/g, respectively. Two different kinetics modelsincluding pseudo first-order and pseudo second-order were studied to evaluate the rate and mechanism of cadmiumadsorption by pumice and nano-pumice. The kinetics data indicate that a pseudo second-order model provides thebest correlation of the experimental data.