Retention of fluoride ions from aqueous solution using porous hydroxyapatite. Structure and conduction properties.
Synthetic porous calcium hydroxyapatite (noted p-HAp) treated with different fluoride concentrations at room temperature in the presence of carbonate, sodium chloride and phosphate-rich media was investigated. The fluoridation rate of the porous calcium hydroxyapatite was 89% using 1 mol/L [F(-)] solution compared with 30% for crystalline hydroxyapatite (c-HAp). The high specific surface area of p-HAp (235 m(2)g(-1)) compared with c-HAp sample (47 m(2)g(-1)) has an important effect on the removal of fluoride ions from aqueous solution, when p-HAp was treated with high fluoride concentration to produce calcium fluorohydroxyapatite materials. Fluoride adsorption on porous hydroxyapatites (p-HAp) modified their structural and conduction properties.
Hammari
L E L
LE
Laboratoire de Chimie Physique Générale, Faculté des Sciences, BP 1014, Rabat, Maroc.
Laghzizil
A
A
Barboux
P
P
Lahlil
K
K
Saoiabi
A
A
D017886:Durapatite / Q000737:chemistry*; D004553:Electric Conductivity; D004563:Electrochemistry; D005459:Fluorides / Q000737:chemistry*; D006813:Humidity; D016062:Porosity; D011208:Powders; D012996:Solutions; D014867:Water
D011208:Powders; D012996:Solutions; D014867:Water; D017886:Durapatite; D005459:Fluorides