Batch and flow-through column adsorption study: recovery of Pt4+ from aqueous solutions by 3-aminopropyl(diethoxy)methylsilane functionalised zeolite (APDEMSFZ)

Alseno K. Mosai, Luke Chimuka, Ewa M. Cukrowska, Izak A. Kotzé and Hlanganani Tutu ()
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Alseno K. Mosai: University of the Witwatersrand
Luke Chimuka: University of the Witwatersrand
Ewa M. Cukrowska: University of the Witwatersrand
Izak A. Kotzé: University of the Witwatersrand
Hlanganani Tutu: University of the Witwatersrand

Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, 2021, vol. 23, issue 5, No 23, 7062 pages

Abstract: Abstract The recovery of platinum from waste is of high importance since significant concentrations are lost during processing, but the current methods are not economically effective. The removal of Pt4+ from aqueous solutions at different conditions using zeolite functionalised with 3-aminopropyl(diethoxy)methylsilane (APDEMS) was investigated. The adsorbent was used to assess the effect of adsorbent mass, pH, concentration, time and competing ions on the removal of Pt4+ so that optimum working conditions could be determined. The two- and three-parameter isotherm models as well as kinetic models were fitted using the experimental data. Effect of adsorbent bed height (2 and 5 cm), pH (2–7) and initial concentration (2 and 5 mg L−1) was determined with column experiments. Significant adsorption capacity was achieved with 100 mg adsorbent at pH 2, within 180 min. Adsorption capacity of Pt4+ significantly decreased at pH > 2. Higher bed depth increased the exhaustion and breakthrough times. The adsorption capacity of Pt4+ increased as bed height and concentration increased. The highest breakthrough and exhaustion times were achieved at pH 2. Strong Pt4+-adsorbent interaction concluded from the experiments, adsorption kinetics and isotherms models indicates that APDEMSFZ is suitable for Pt4+ recovery from mining wastewater.

Keywords: Platinum4+; Adsorption capacity; Recovery; Column; Adsorption models (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s10668-020-00903-x

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