A Natural Biomass-Sediment as a Hybrid Organic-Mineral Sorbent for the Removal of Zinc in Aqueous Systems.

Autor: Khiari, Nouha, Sdiri, Ali, Chemingui, Hajer, Khadhar, Samia
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Zdroj: Water, Air & Soil Pollution; Oct2023, Vol. 234 Issue 10, p1-20, 20p
Abstrakt: Biosorption of zinc ions onto algae, sediment and the mixture algae -sediment was examined through the study of sorption parameters: the effect of pH, contact time, bio sorbent and Zn(II) concentrations. The optimum conditions for the experiments were performed at a pH 7.5, 8 and 9 for algae, sediment and the mixture algae-sediment, respectively. Metal-biomass-sediment interactions were examined by the Fourier Transform Infrared Spectroscopy (FTIR) of algae, sediment and the mixture. FTIR results confirmed the existence of functional groups O–H; -C-H, N–H, C = O and metal-OH; a slight shift of bands confirmed the adsorption of zinc. Kinetic study has indicated that the sorption process attained its equilibrium after 120 min, with the pseudo second order is suited kinetic model for the experimental data. The distribution coefficients Kd indicated that values decreased with the increase of Zn(II) concentration for the algae and the sediment amounts but increased with the increased mixture hybrid sorbent. The distribution coefficients Kd variations depends of the sorption actives site and hydrogen potential (pH). Data obtained fitted well with Langmuir and Freundlich isotherm using sediment and better fitted with Freundlich isotherm using algae and the mixture. The results indicated that the potential use of mineral-organic sorbent for the removal of zinc in aqueous system is possible and technically feasible with a superior efficiency. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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