Calcium phosphate precipitation for removal of textile dyes

from industrial wastewaters

W. Lemlikchi, N. Oubagha, P. Sharrock, M. Fiallo, M.O. Mecherri

Castres

Tizi-OuzouUniversité Mouloud Mammeri

Tizi-Ouzou 15000 AlgérieUniversité Paul Sabatier Toulouse 3,

Castres 81104 France

[Ca10(PO4)6(OH)2] = HA

Adsorption of dyes on hydroxyapatite

Sorbant materialused for heavy metals remediation

Solid stateGelCo-precipitation (nucleation)

Alizarin red S

Adsorption: 1.4 g of dye in 1 g HA

Nucleation of hydroxyapatite = 99 %

Remediation of textile dyes by HA

Blue Hydron (Vat Blue 43) 1909

Interaction between Blue Hydron and HA

adsorption co-precipitation

Loss of water

Loss of organic matter

Combustion ofgraphitic carbon

Thermogravimetric analysis of the precipitate

adsorption

Co-precipitation

Co-precipitation

adsorption

Time 75 min; pH 7.3

Co-precipitation

adsorption

Co-precipitation

adsorption

Time 75 min Time 15 min

H3PO4

CASTRES

Pays de cocagne