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Study on the reaction behaviors of manganese-coated filter sand in the presence of both iron and manganese
We learned more about manganese-coated sand in the past research, like reaction mechanism, kinetic model, and environment conditions and so on. This study was conducted to investigate the effect that in different conditions and changed the concentration ratios in the presence of both iron and manganese on the removal of iron and manganese from water by artificial manganese-coated sand. Then, put the data into the kinetic model, attempted to find the relationship and the trend by the theory of adsorption model.
According to the cross-section of artificial manganese -coated sand analysis, we find that iron would diffuse into its inner layer in the presence of both iron and manganese. In the concentration of both iron and manganese were 20 mg/L at pH=5, the removal of Mn2+ was 74%, it seemed to be smaller than 88% of the past research achievement (Chen, 2002), this result might be due to the limited adsorption sites in the area of manganese-coated sand. In the isotherm adsorption curve, it could be observed that the area of artificial manganese-coated sand was multilayer adsorption in the presence of both iron and manganese because of the autocatalytic reaction of Mn2+
In the result of experimentation, both Mn2+ and total manganese displayed on a rise trend steeply between pH=4.5 and pH=5, but we saw that both Fe2+ and total iron displayed on a rise trend slowly between pH=4.5 and pH=5, it was due to the oxidation of iron ions were stronger than manganese ions at the same pH, so it could get a higher removal.
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