Metal Ion Binding on Hydroxyapatite (Hap) and Study of the Velocity of Sedimentation

The objective of this study is to develop by chemical synthesis of hydroxyapatite, an adsorbent powder to be used for the decontamination of waters by metal ions. Moreover, the effectiveness of chitosan produced from shrimp waste to flocculate turbid suspensions produced from the previous treatment...

Full description

Saved in:
Bibliographic Details
Published in:Procedia engineering 2012, Vol.33, p.377-384
Main Authors: Kadouche, Slimane, Zemmouri, Hassiba, Benaoumeur, Kacem, Drouiche, Nadijb, Sharrock, Patrick, Lounici, Hakim
Format: Article
Language:English
Subjects:
Chitosane
hydroxyapatite
ion binding
nano-particles
settling velocity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The objective of this study is to develop by chemical synthesis of hydroxyapatite, an adsorbent powder to be used for the decontamination of waters by metal ions. Moreover, the effectiveness of chitosan produced from shrimp waste to flocculate turbid suspensions produced from the previous treatment is evaluated. The study of adsorption of Cu and Zn on hydroxyapatite showed a removal efficacy of 88-95% with relatively fast kinetics. Between the two metals, copper presents the higher adsorbing tendency. However, the use of hydroxyapatite, as an adsorbent, generates turbid suspensions which are hardly settleable. For this reason we evaluated the effectiveness of chitosane to flocculate the hydroxyapatite turbid suspensions. The outcome of this study is the great efficacy exhibited by the chitosan to remove the turbidity of various samples of hydroxyapatite of different fractions. The elimination rate after 30minutes of settling in all cases exceeds 98%. The effect of the dose of chitosane and the effect of pH on the coagulation-flocculation process were studied and the respective results show that the optimal doses range from 0.2 to 2 mg of chitosane/ L corresponding at optimal pH between 6 and 7.
ISSN:1877-7058
1877-7058
DOI:10.1016/j.proeng.2012.01.1217