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Arsenite oxidation by ferrate in aqueous solution

机译:通过水溶液中的铁酸盐氧化

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Arsenite [As(III)] is much more toxic and difficult in removal than arsenate [As(V)].Therefore, a method for removing As(III) is more urgently needed than for As(V).The precondition for better As(III) removal is to oxidize it to As(V). This studyinvestigates the oxidation ability of ferrate, Fe(VI), under different pH conditions,different initial concentrations of As(III) and different dosages of Fe(VI). The resultsshow that Fe(VI) is an effective oxidizer for As(III) under basic condition. The pHvalue of tested water is a significant factor affecting the oxidation efficiency of As(III)by Fe(VI). Although theoretical redox analyses suggest that Fe(VI) is a betteroxidizer under acidic condition, the experimental results show that basic conditionis more efficient than acidic condition for As(III) oxidation by Fe(VI) due to the acid-catalyzed redox reaction between Fe(VI) and H_2O. Initial As(III) concentration doesnot play an important role in affecting the oxidation efficiency. The results in thisstudy also reveal that the final product of Fe(VI) is Fe(III) and the needed mole ratioof Fe(VI):As(III) for complete As(III) oxidation under basic condition is 2:3.
机译:亚砷酸盐[AS(iii)]比砷酸盐[AS(v)]更毒性和困难。因此,更迫切需要去除(iii)的方法,而不是为(v)。前提是(iii)去除是将其氧化为(v)。该研究从不同的pH条件下,不同的pH条件下,初始浓度为(III)和不同剂量的Fe(vi)的氧化能力。 Fe(VI)的结果是在基本条件下为(III)的有效氧化剂。测试水的估值是影响Fe(vi)的氧化效率的重要因素。虽然理论氧化还原分析表明Fe(VI)是酸性条件下的叶氧化钠,但实验结果表明,由于Fe(vi)由于Fe之间的酸催化的氧化还原反应,基本条件比Fe(III)氧化更有效(vi)和h_2o。初始IS(III)浓度不会在影响氧化效率方面发挥重要作用。鉴定的结果还揭示了Fe(VI)的最终产物是Fe(III)和Fe(VI)所需的摩尔比:(iii)在基本条件下完全氧化为2:3。

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