NDLI: Investigation of the adsorption/desorption equilibria of Cd(II), Zn(II) and Cu(II) ions on/from immobilized digested sludge using biosurfactants

Content Provider	Springer Nature Link
Author	Filipkowska, Urszula Kuczajowska Zadrożna, Małgorzata
Copyright Year	2016
Abstract	The study investigated the adsorption characteristic of Cd(II), Zn(II) and Cu(II) ions and their mixture on activated sludge immobilized in 1.5 % sodium alginate with 0.5 % polyvinyl alcohol (ASAA), and the desorption of these metal ions from biosorbent using biosurfactants (saponin and JBR 515) and HNO$_{3}$. Cadmium, zinc and copper were most effectively adsorbed by the immobilized sludge in a pH range of 5.0–6.0. Desorption of metals with saponin was the most effective at pH 1–5, with rhamnolipid JBR 515—at pH 5–6 and with HNO$_{3}$ at pH 2.0. The results of adsorption and desorption were presented with the use of Freundlich, Langmuir, Redlich–Peterson, Sips and a double Langmuir adsorption isotherm equations. The coefficient of determination R $^{2}$ and the average relative error were used to evaluate whether the models fit to experimental data. The best fit of the adsorption isotherm equation to experimental data was demonstrated for the double Langmuir isotherm. The highest adsorption capacity from solutions containing single metals was obtained for Cd (108.83 mg/g dm). For solutions containing metal mixture, the highest adsorption capacity (37.21 mg/g dm) was obtained for Cu. The highest desorption of single metals was received with the use of saponin and HNO$_{3}$ (over 90 %). Biosurfactants were shown to be the most effective in leaching of metals from their mixture. The desorption efficiency of saponin for each metal was over 99 %.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	9
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-04-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metals Biosorption Desorption Biosurfactant Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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