P-recovery by secondary nucleation and growth of calcium phosphates on magnetite mineral

Water Research
Nuray KarapinarHermann H Hahn

Abstract

Precipitation of calcium phosphates from supersaturated solutions seeded with magnetite powder (magnetite mineral, Fe3O4) has been studied in lab scale in the pH range 6.9-7.7. While the initial concentration of phosphorus was 1.29 mmol/l, the initial molar ratio of Ca/P was taken one to three times of the stoichiometric calcium to phosphorus ratio of hydroxyapatite. To bring out the secondary nucleation, the precipitation system was allowed to relax and pH of the solution was maintained at the initially preset value. The period before base was added for the first time during relaxation was defined as lagtime and sodium hydroxide added during the relaxation was evaluated as the degree of growth. The lagtime was found to be dependent on the solution pH, therefore on the initial amount of precipitation. Coverage of seed surface by heterogeneous nucleation is essential. Since all precipitation by secondary nucleation took place on the seed material, precipitation during relaxation was due to growth of the solid phase on the seed surfaces. It was found that there was a pH range in which growth rate was directly proportional to pH. However, at lower residual concentrations of phosphorus, despite relatively higher pH, the growth rate...Continue Reading

References

Apr 1, 1997·Journal of Biomedical Materials Research·W WuG H Nancollas
Jan 24, 2002·Environmental Technology·K MoriyamaK Nakamachi
Jul 21, 2004·Water Research·Nuray KarapinarHermann H Hahn

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Citations

May 9, 2013·Environmental Science & Technology·Yang ZhangBart Van der Bruggen
Jun 14, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Guillaume ThomasNadine Millot
Feb 1, 2020·Environmental Science and Pollution Research International·Dongsheng LiuQilong Liao
Jan 6, 2017·Environmental Science and Pollution Research International·Hongliang DaiHuaqing Zhsssu

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