Some aspects of estimation of extraction selectivity under the conditions of competitive sorption on modified silica gels
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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.
KeywordsAdsobtion capacity Multicomponent sorbtion Silica gel Surface modification Thiosemicarbazide Formazan
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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Conflict of interest
The authors declare that they have no conflict of interest.
- 5.Price Peter M, James HC, Duncan JM (2000) Modified silicas for clean technology. J Chem Soc Dalton Trans: 101–110. https://doi.org/10.1039/A905457J
- 14.Shaheen SM, Tsadilas CD, Rinklebe J (2013) A review of the distribution coefficients of trace elements in soils: influence of sorption system, element characteristics, and soil colloidal properties. Adv Colloid Interface Sci 201-202:43–56. https://doi.org/10.1016/j.cis.2013.10.005 CrossRefGoogle Scholar
- 22.Filip E, Nadejde C, Creanga D, Dorohoi D (2009) Spectral investigation of triphenylformazan derivatives in ultra violet light. Rom J Phys 54:649–657Google Scholar