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Influence of clay suspensions on the precipitation of CaCO 3 in seawater
Author(s) -
Karoui H.,
Tlili M. M.,
Riffault B.,
Ben Amor M.,
Mosrati H.,
Mosrati R.,
Gil O.
Publication year - 2010
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200900607
Subject(s) - aragonite , supersaturation , crystallization , montmorillonite , nucleation , calcium carbonate , seawater , kaolinite , chemistry , precipitation , carbonate , chemical engineering , mineralogy , calcite , inorganic chemistry , geology , organic chemistry , oceanography , physics , meteorology , engineering
The effect of montmorillonite and kaolinite, most common clay in marine water, on nucleation and growth of calcium carbonate in standard sea water was studied. Crystallization was induced by the degasification of the dissolved carbonic gas. It was shown by XRD and SEM analysis that CaCO 3 crystallize under its aragonite polymorph some either the clay concentration or type. It was also found that tested clays inhibited significantly the crystallization of calcium carbonate, especially for concentrations higher than 25 mgL –1 . From the fine analyses of the formed solid, it was suggested that the tested clays have an indirect effect on nucleation and growth of aragonite by increasing the Mg ions concentration, strong inhibitor of CaCO 3 formation, in the neighbourhood of clay particles where supersaturation is the higher and than crystallization can occur. In addition to its indirect role, kaolinite can interact with aragonite by adsorbing on their faces and blocking growth sites (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)