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Diffusion Kinetics of Carbonate Hydroxyapatite (CHAP) for Adsorbing F − Dissolved in Water
Author(s) -
Zhiliang HUANG,
Lianmeng ZHANG,
Yu LIU,
Qilin WANG,
Qianjun HE,
Wei CHEN
Publication year - 2006
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2006.tb00237.x
Subject(s) - diffusion , kinetics , chemistry , carbonate , vacancy defect , adsorption , membrane , chemical engineering , thermodynamics , crystallography , organic chemistry , biochemistry , physics , quantum mechanics , engineering
A systematic research was performed about diffusion kinetics of adsorbing F − dissolved in water for carbonate hydroxyapatite (CHAP) from the natural hydroxyapatite which was modified by adulterating with CO 2 3 . The result shows that the speed of F − adsorption is controlled by membrane diffusion when F − concentration is relatively low, which is expressed by the kinetic equation of diffusion Q =0.0005( C 1 ‐ C )( t ‐ t 1 )+0.3967, or by vacancy diffusion when F − concentration is relatively high, which is expressed by the kinetic equation of diffusion In[ C (o, t )]=8.4718‐0.5048ln t . Based on the feature of CHAP for adsorbing F − dissolved in water and its special channel of the structure of CO 2 3 ‐ modified hydroxyapatite, models of vacancy diffusion and membrane diffusion were established.