Studies of selective adsorption, desorption and reuse of chemically altered biomass produced from aquatic macrophytes for treatment of metal-containing wastewater

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Rachel de Moraes FerreiraDanielle Marques de Araujo Stapelfeldt

Abstract

The aquatic macrophytes Salvinia sp. and Pistia stratiotes have a natural capacity to adsorb various elements, including heavy metals. This capacity was enhanced with a chemical treatment using NaOH alkaline solution for Salvinia sp. and a mixture of both Salvinia sp. and Pistia stratiotes at a proportion of 1:1, whose respective biosorbents were called SSOH and MBOH. Adsorption tests were done in a ternary system containing the metals copper, lead and manganese; the parameters considered were: starting concentration, kinetics, pH and temperature. The adsorption isotherms for SSOH had a maximum adsorptive capacity of 50.20, 53.85 and 14.68 mg g-1 for Cu, Pb and Mn, respectively; for MBOH, maximum values were 44.62, 35.17 and 15.74 mg g-1 for Cu, Pb and Mn, respectively. The metals displayed different behaviors with pH variation. The results also showed an adsorption preference of Cu > Pb > Mn for SSOH. Desorption and readsorption studies were also carried out, showing 100% desorption and increased adsorption capacity in readsorption tests. Surface area and porosity analysis with the Brunauer-Emmett-Teller (BET) method indicate that after chemical modification, MBOH and SSOH biomasses had their surface increased in comparison to...Continue Reading

References

Sep 27, 2003·Water Research·Thomas A DavisAlfonso Mucci
Nov 8, 2011·Bioresource Technology·Dumitru Bulgariu, Laura Bulgariu
Mar 1, 2012·Water Environment Research : a Research Publication of the Water Environment Federation·Chiara PennesiFrancesca Beolchini
Jun 5, 2013·Colloids and Surfaces. B, Biointerfaces·María Mar ArecoMaría Dos Santos Afonso
May 28, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Rachel de Moraes FerreiraDanielle Marques de Araujo Stapelfeldt

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Citations

Aug 25, 2019·Environmental Science and Pollution Research International·Jessika Cabral G OliveiraDanielle M A Stapelfeldt

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