Magnetically attracted iron scrap anode based electrocoagulation for phosphate removal

Dandan Zhu, Xiaoting Hong, K. S. Hui

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Abstract

This study shows the effectiveness of a novel electrocoagulation process using magnetically attracted iron scrap anodes for phosphate removal from aqueous solution. The effect of contact time, reaction temperature, dose of iron scrap, initial phosphate concentration, applied voltage, pH, magnetic force, and the species of competing anions on the efficiency of phosphate removal and the reaction products has been investigated. The techniques of XRD, XPS, and VSM were used to characterize the elemental composition and the types of the reaction products in order to clarify the interaction between novel anode and phosphate ions. The removal of phosphate was fitted by a pseudo first-order reaction kinetic model. The results showed that magnetically attracted iron scrap anodes were electrodissoluted under an applied potential and reacted with phosphate into Fe-hydroxo-phosphate complexes. The work suggested that electrocoagulation using magnetically attracted iron scrap anodes had the potential to become a promising technique for phosphate precipitation.
Original languageEnglish
Pages (from-to)216–224
Number of pages9
JournalWater Science and Technology
Volume84
Issue number1
Early online date3 Jun 2021
DOIs
Publication statusPublished - 1 Jul 2021

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