Abstract
Systematic studies of silica gels with covalently immobilized thiosemicarbazide and formazan groups under the conditions of competitive sorption from multicomponent systems were conducted. A methodological approach to determine the selectivity of the modified sorption material with regard to Cu(II), Ni(II), Co(II), Cd(II), and Zn(II) was proposed. Solid-phase extraction in equilibrium conditions of Cu(II), Zn(II), Co(II), Cd(II), and Ni(II) on a silica gel with covalently immobilized thiosemicarbazide and formazan groups in the conditions of competitive sorption was studied. The possibility to use the pseudo-second-order kinetic equation for assessment of mutual influence at competitive sorption has been shown. We found that sorption from multicomponent solutions proceeds as a non-additive process under the conditions of an excess of functional groups.
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Acknowledgements
This publication was financially supported by the Russian Ministry of Education and Science (project no. 4.4892.2017/8.9). This work was accomplished with the use of the scientific equipment of the Centre of Collective Employment “Ecoanalytical Centre”, Kuban State University (RFMEFI59317Х0008).
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Highlights
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Sorption of Cu (II), Zinc (II), Ni(II), Co(II), Cd (II) from multicomponent solutions proceeds as a non-additive process under the conditions of an excess of functional groups
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Copper (II) and Zinc (II) have shown selectivity at extraction on the modified silica gels
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The possibility to use the pseudo-second order kinetic equation for assessment of mutual influence at competitive sorption has been shown
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Konshina, D.N., Temerdashev, Z.A. & Konshin, V.V. Some aspects of estimation of extraction selectivity under the conditions of competitive sorption on modified silica gels. J Sol-Gel Sci Technol 86, 34–41 (2018). https://doi.org/10.1007/s10971-018-4619-9
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DOI: https://doi.org/10.1007/s10971-018-4619-9