Adsorption of some heavy and toxic metals in Thermaikos gulf sediments by surface complexation models: environmental impacts

Abstract

Adsorption of Cr, Cu,Zn, Ni and Cd on the surface of sea-sediments from Thermaikos gulf was studied as a function of pH, ionic strength and metal solution concentration. Furthermore, the charge development on the sediment's surface was studied in the pH range ~2,8 to ~10.0, by acid-basepotentiometric titrations. Both sediments exhibit low point of zero charge (pH<3.0). Metals adsorption curves, as a function of suspension pH, have a sigmoidal shape. the following selective adsorption sequence is evident: Cr>Cu>Zn>Ni>Cd. The increase of metal concentration, as well as the increase of ionic strength, shifts the adsorption curve in higher pH values. The sediment that has bigger surface area adsorbs the studied metalsin slightly lower pH values. Surface complexation models, such as Difusse Double Layer Model (DDLM) and Constant Capacitance Model (CCM), were applied to the experimental data of potentiometric titrations and adsorption of metals, using the least square optimization program ...
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DOI
10.12681/eadd/12722
Handle URL
http://hdl.handle.net/10442/hedi/12722
ND
12722
Alternative title
Μελέτη της προσρόφησης βαρέων μετάλλων και τοξικών στοιχείων στα ιζήματα του Θερμαϊκού κόλπου, με τη χρήση μαθηματικών προτύπων επιφανειακής συμπλοκοποίησης: περιβαλλοντικές επιπτώσεις
Author
Ioannou, Dafni (Father's name: I.)
Date
2001
Degree Grantor
Technical University of Crete (TUC)
Committee members
Φώσκολος Αντώνιος
Βαρότσης Νικόλαος
Καλλιάνου Χαρίκλεια
Μαρκόπουλος Θεόδωρος
Ασημακόπουλος Ιωάννης
Γκέκας Βασίλειος
Χρηστίδης Γεώργιος
Discipline
Engineering and TechnologyEnvironmental Engineering
Keywords
Adsorption; Heavy metals; Complexation models; Zero charge; Thermaikos gulf; Environmental impacts
Country
Greece
Language
Greek
Description
iv, 150 σελ., im.
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