Desorption Kinetics of Heavy Metals (Lead, Zinc, and Nickel) Coexisted with Phenanthrene from a Natural High Buffering Soil

Abstract

This work aims to investigate the competitive time-dependent desorption rate of heavy metals (lead, zinc, nickel) coexisting with phenanthrene from natural high buffering soil. Two non-ionic surfactants (Tween 80 and Brij 35) combined with disodium ethylene diamine tetraacetate salt (Na2-EDTA) were utilized as the reagents. The contaminants' time-dependent desorption data was fitted with five kinetic models including parabolic diffusion, Elovich, fractional power function, pseudo-first and-secondorder equations. The best removal of contaminants obtained by the mixture of Tween 80/EDTA; desorbing 93% of lead (Pb). The competitive desorption of nickel (Ni) and zinc (Zn) is affected by the stability of Metal-EDTA complexes. Moreover, phenanthrene removal in the soil studied was slow and laborious. The desorption kinetics are well described by parabolic diffusion (for phenanthrene) and pseudo-second-order (for heavy metals of interest). In the soil-surfactant-water system, soil structure changes were negligible; however, Tween 80 influenced the development of crystal faces of CaCO3 during the process.

Soil Contaminants and Their Removal through Surfactant-Enhanced Soil Remediation: A Comprehensive Review

“…Further, the removal of phenanthrene from the targeted soil was a difficult and slow process, and the desorption kinetics could be described by pseudo-second-order parabolic diffusion (for phenanthrene) and by the same model (for the heavy metals of interest). The composition of the soil stayed the same in the soil-surfactant-water mixture; however, the addition of Tween 80 influenced the formation of the faces of CaCO 3 crystals [55]. Piccolo et al, 2021 [56], investigated the exploitation of green organic surfactants like humic acids from lignite to eradicate heavy metals (HM) and polychlorobiphenyls (PCB) from a severely polluted soil obtained from industries in northern Italy.…”

Efficient Removal of Copper Ion from Aqueous Solution using Crosslinked Chitosan Grafted with Polyaniline

“…Heavy metals removal from wastewater is a global issue since they are the most dangerous environmental pollutants. Various industries, especially metal finishing, electroplating, plastics, battery, and etching are continuously releasing copper in their discharges [1][2][3][4].…”