@article { author = {Mohamadi, Sedigheh and Saeedi, Mohsen and Mollahosseini, Afsaneh}, title = {Desorption Kinetics of Heavy Metals (Lead, Zinc, and Nickel) Coexisted with Phenanthrene from a Natural High Buffering Soil}, journal = {International Journal of Engineering}, volume = {32}, number = {12}, pages = {1716-1725}, year = {2019}, publisher = {Materials and Energy Research Center}, issn = {1025-2495}, eissn = {1735-9244}, doi = {10.5829/ije.2019.32.12c.04}, 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 -second-order 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.}, keywords = {Ethylene Diamine Tetraacetate,Heavy-metal,Kinetic,Soil,Surfactant}, url = {https://www.ije.ir/article_98867.html}, eprint = {https://www.ije.ir/article_98867_ffb01556a023cf469f85ae36ea08f42b.pdf} }