| Autor: |
Lemlikchi, W., Sharrock, P., Mecherri, M.O., Fiallo, M., Nzihou, A. |
| Zdroj: |
Desalination & Water Treatment; February 2014, Vol. 52 Issue: 7-9 p1669-1673, 5p |
| Abstrakt: |
AbstractWhen unsintered hydroxyapatite (HA) is dissolved in acidic solution (pH less than 3), the calcium salt dissolves readily and may be re-precipitated at neutral pH values by neutralization with base. Maturation of this precipitate eventually leads to the neo-formation of calcium phosphates similar to HA. HA is a stable solid under neutral or basic conditions and has interesting adsorption properties. Particularly, textile dyes can be adsorbed on HA particles. Thermal treatment below 800°C degrades adsorbed organic matter and generates mineral HA. Such HA can be recovered and reused by re-dissolution in acidic water. We have experimented with such recycled HA the co-precipitation of textile dyes and found that HA can be reused several times. For most textile dyes, a very high level of color removal was observed (above 98%), with a small loss of HA during the recycling process (12%). This makes the treatment of textile dye polluted waters by HA co-precipitation feasible and sustainable. |
| Databáze: |
Supplemental Index |
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