Ferrate(IV) and Ferrate(VI) mixture interaction: efficiency and mechanism

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ABSTRACT The mixing of ferrate (IV) with ferrate (VI) rapidly produced ferrate (V), Ferrate (V) react at much higher rates than the ferrate(VI), leading to the rapid abatement of organic pollutants. In this reported study researched a new method of water treatment. The oxidation efficiencies of ferrate(IV), ferrate(VI), and mixtures of ferrate(IV) + ferrate(VI) for the oxidation of wastewater containing Acid Red 88 were investigated. The rates of oxidation of the Acid Red 88 were as follows: ferrate (IV) + ferrate (VI) > ferrate (VI) > ferrate (IV), and the highest oxidation rate of the dye was achieved when the molar ratio of ferrate (IV) to ferrate (VI) was approximately 1:1 are only valid under acidic conditions. Ferrate (IV) mixed 1:1 with ferrate (VI) appeared to produce a black–gray substance that disappeared from the solution after approximately 1 min. It was demonstrated that this material was Fe(V) through the phosphate experiment. It had a characteristic UV absorption at 546 nm and an IR absorption at 1112 cm−1. UV spectroscopy revealed that the oxidation mechanisms of ferrate(IV) + ferrate(VI), ferrate(VI), and ferrate(IV) were essentially the same. A mixture of ferrate (IV) and ferrate (VI) is used to degrade organic matter so that the reaction rate can be improved without increasing the cost.