Dura, Adelaide and Breslin, Carmel B. (2019) The Removal of Phosphates using Electrocoagulation with Al-Mg Anodes. Journal of Electroanalytical Chemistry, 846 (113161). ISSN 1572-6657

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Abstract

The removal of phosphates, to levels below the detection limit, was achieved over a 30 to 60 min period, depending on the initial phosphate concentration, with Al−Mg anodes in an electrocoagulation cell at 11.0 mA cm−2 with a surface area to volume ratio of 11.7 m−1. The Al−Mg alloy performed well in low chloride concentrations of 4.2 mM NaCl and the complete removal of phosphates from two real water samples was achieved after a 15−min period. The removal efficiency, although depending on the initial pH, appears to depend on the evolution of pH during electrocoagulation with more efficient removal at a final pH of 7.5. Using the Freundlich adsorption model, the adsorption capacity, kF, was computed as 146 mg g−1, corresponding to the adsorption of 146 mg of phosphate per gram of the aluminium−hydroxy coagulant. The efficient removal of the phosphates was attributed to the low corrosion potentials and the lack of a passive region observed using polarisation and cyclic polarisation experiments, which in turn facilitate dissolution of the anode.

Item Type:	Article
Additional Information:	Cite as: Adelaide Dura, Carmel B. Breslin, The removal of phosphates using electrocoagulation with Al−Mg anodes, Journal of Electroanalytical Chemistry, Volume 846, 2019, 113161, ISSN 1572-6657, https://doi.org/10.1016/j.jelechem.2019.05.043.
Keywords:	Electrocoagulation; Al-Mg anode; Phosphates; Adsorption; Coagulants;
Academic Unit:	Faculty of Science and Engineering > Chemistry
Item ID:	14127
Identification Number:	https://doi.org/10.1016/j.jelechem.2019.05.043
Depositing User:	Dr. Carmel Breslin
Date Deposited:	04 Mar 2021 15:08
Journal or Publication Title:	Journal of Electroanalytical Chemistry
Publisher:	Elsevier
Refereed:	Yes
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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