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vol.23 issue4Mercury compounds. Review on determination, treatment and disposal methods.New trends for treatment of industrial effluents containing organochloride species author indexsubject indexarticles search
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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064

Abstract

AIROLDI, Claudio  and  FARIAS, Robson Fernandes de. The use of organofuntionalized silica gel as sequestrating agent for metals. Quím. Nova [online]. 2000, vol.23, n.4, pp.496-503. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422000000400012.

An overview about the homogeneous and heterogeneous methods of synthesizing silylating agents and applications of the organofunctionalized silica-gel samples was explored. The pendant molecules attached covalently to the inorganic surface displayed important properties to act as sequestrating agents for metals in aqueous and non-aqueous solutions. The large variety of basic centres anchored on organic molecules improve the capacity in adsorbing cations. The increase in adsorption is dependent on the number of basic atoms disposed on the pendant molecules on the surface. The combination of acidic and basicity properties favours the selectivity, such is exemplified by the thiol modified silicas towards mercury (II) cations.

Keywords : silica; immobilization; cation; sequestrating agent.

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