Journals Information
Universal Journal of Materials Science Vol. 5(3), pp. 59 - 63
DOI: 10.13189/ujms.2017.050301
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Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution
Hiroaki Onoda *, Kohei Sasaki
Department of Informatics and Environmental Sciences, Faculty of Life and Environmental Sciences, Kyoto Prefectural University, Japan
ABSTRACT
Calcium phosphate is an important material used in ion exchangers and adsorbents. In this work, calcium hydrogen phosphate dihydrate, 
, was prepared from calcium nitrate solution and phosphoric acid. This phosphate transformed to calcium hydrogen phosphate un-hydrate, CaHPO4, by heating at 200℃, and calcium pyrophosphate, Ca2 P2 O7, by heating at 400 and 700℃. These calcium phosphates were used to remove trivalent iron cation, Fe3+ in solution. Samples without heating and those heated at 200℃ indicated a high iron removal ratio. By the addition of these calcium phosphates and stirring for 5 minutes, a high ratio of iron cation was removed from the solution. This removal depended not only on the substitution of calcium to iron, but also on the precipitation of iron hydroxide. Calcium phosphates were also used to remove copper and nickel cations, Cu2+ and Ni2+. The removal ratios of copper and nickel cations were lower than those of iron cation.
KEYWORDS
Calcium Phosphate, Transition Metal, Purification of Water, Precipitation
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Hiroaki Onoda , Kohei Sasaki , "Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution," Universal Journal of Materials Science, Vol. 5, No. 3, pp. 59 - 63, 2017. DOI: 10.13189/ujms.2017.050301.
(b). APA Format:
Hiroaki Onoda , Kohei Sasaki (2017). Iron, Copper, and Nickel Removal with Calcium Hydrogen Phosphate and Calcium Pyrophosphates in Solution. Universal Journal of Materials Science, 5(3), 59 - 63. DOI: 10.13189/ujms.2017.050301.