2010•Journal of Natural Science of Heilongjiang UniversityRequires access
Removal of phosphate from aqueous solution with Fe formed in situ prepared by oxidation of FeSO_4 with KMnO_4
Xiao-Ling Shao
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Abstract
A novel method for phosphate removal from aqueous solution was proposed which is characterized by precipitating phosphate by Fe formed in situ prepared through the oxidation of FeSO4 with KMnO4.Results indicated that the optimum molar ratio of KMnO4 and FeSO4 was 0.33.The removal of phosphate increased with the increase of Fe dosages and decreased with the increase of pH values.Compared with ferric sulfate,the KMnO4/Fe2+ process was more efficient for phosphate removal at pH 6～9.The differences in phosphate removal by ferric sulfate alone and the KMnO4/Fe2+ process was attributed to the different chemical and physical properties of conventional Fe3+ and Fe3+ formed in situ.With the presence of calcium or magnesium ion,phosphate removal in KMnO4/Fe2+ process was increased at pH 4～9 and the enhancement was more significant at pH 7～9.The results of this study could also help us to provide specific reference for the practical application of KMnO4/Fe2+ process for phosphate removal.