International Journal of Engineering، جلد ۳۲، شماره ۱۲، صفحات ۱۷۱۶-۱۷۲۵
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عنوان انگلیسی Desorption Kinetics of Heavy Metals (Lead, Zinc, and Nickel) Coexisted with Phenanthrene from a Natural High Buffering Soil
چکیده انگلیسی مقاله 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.
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نویسندگان مقاله Sedigheh Mohamadi |
Environment Research Laboratory, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

Mohsen Saeedi |
Environment Research Laboratory, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

Afsaneh Mollahosseini |
Research Laboratory of Spectroscopy & Micro and Nano Extraction, Department of Chemistry, Iran University of Science and Technology, Tehran, Iran

نشانی اینترنتی http://www.ije.ir/article_98867_ffb01556a023cf469f85ae36ea08f42b.pdf
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