Metals Removal from Aqueous Solution by Iron-Based Bonding Agents

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2004 (EN)
Metals Removal from Aqueous Solution by Iron-Based Bonding Agents

Matis, Konstantinos
Lazaridis, Nikolaos
Deligianni-Giannakoudaki, Eleni
Peleka, Effrosyni

Goal and Scope and Background. The application of a promising method, termed sorptive flotation, for the removal of chromium(VI) and zinc ions was the aim of the present paper. A special case of sorptive flotation is adsorbing colloid flotation. Suitable sorbent preparation techniques have been developed in the laboratory. Methods. Sorptive flotation, consisting of the sorption and flotation processes combined in series, has proved to give fast and satisfactory treatment of the industrial streams and effluents bearing dilute aqueous solutions of zinc and chromium(VI). Results and Discussion. Goethite has proved to be effective for the removal of chromium(VI) and zinc ions. Also, adsorbing colloid flotation with ferric hydroxide (as the co-precipitant) could be an alternative method to the above-mentioned separation of metal ions. In both cases, chromium(VI) (pH=4) and zinc (pH=7) removal was about 100%. Conclusion. The reasons for selecting the iron-based bonding materials, like goethite and/or in-situ produced ferric hydroxide, are that they are cheap, easily synthesized, suitable both for cation and anion sorption, and, furthermore, that they present low risks for adding a further pollutant to the system. Promising results were obtained. Recommendation and Outlook. The application of goethite and in-situ produced ferric hydroxide has demonstrated their effectiveness in the removal of heavy metal ions, such as chromium anions and zinc cations. A proposed continuation of current work is the utilization of similar iron oxides, for instance synthesized akaganeite. The comparison between the results reported in this paper with the results reported in the literature, also deserves attention

Article / Άρθρο

Επίπλευση προσροφημένου κολλοειδούς
Sorptive flotation
Adsorbing colloid flotation
Απομάκρυνση μετάλλων
Iron-based bonding agents
Προσροφητικά επίπλευση
Metals removal
Προσροφητικά υλικά βασισμένα στο σίδηρο
Αqueous solution
Υδατικά διαλύματα

Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (EL)
Aristotle University of Thessaloniki (EN)



Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Σχολή Θετικών Επιστημών, Τμήμα Χημείας

Environmental Science and Pollution Research, vol.11 no.1 [2004] p.18-21 [Published Version]

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