Application of sphagnum moss peat in ecological remediation of oxyanions contaminated aqueous solutions

Gabriela Ungureanu1, Catalin D. Balan2, Irina Volf2

1 University of Porto, Faculty of Engineering, Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Department of Chemical Engineering, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
2 Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, Department of Environmental Engineering and Management, 73 Prof. Dr. docent Dimitrie Mangeron Street, 700050 Iasi, Romania

Abstract


The potential of Sphagnum moss peat to adsorb oxyanions (As(III), As(V), Sb(III), Sb(V) and Se(VI)) from aqueous solution was studied in batch mode. For arsenic (both species) and selenium, the results were negative: moss peat is not able to retain these oxyanion. For antimony, the hydroxyl and carboxyl groups from the Sphagnum moss peat surface seems to be responsible for Sb uptake. Kinetic studies were conducted for both Sb(III) and Sb(V) and a fast uptake process was observed, equilibrium being achieved in about 2 hours. Equilibrium studies reveals considerable adsorbed amounts of Sb(III) and Sb(V).The experimental sorption capacity resulted for Sb(III) was around 3 mg/g and nearly 3.3 mg/g for Sb(V), at pH 2 and 23 1 C. The influence of pH (in the 2-8 range) is modest in case of Sb(III) and insignificant for Sb(V) sorption. Following the results, it is possible to conclude that Sphagnum moss peat could be used in ecological remediation of antimony contaminated aqueous solutions.

Keywords


oxyanions; remediation; sorption; Sphagnum moss peat

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