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Titania-Coated Silica Alone and Modified by Sodium Alginate As Sorbents for Heavy Metal Ions

Overview
Journal Nanoscale Res Lett
Publisher Springer
Specialty Biotechnology
Date 2018 Apr 14
PMID 29651652
Citations 5
Authors
D Kolodynska
M Geca
E Skwarek
O Goncharuk
Affiliations
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Abstract

The novel organic-inorganic biohybrid composite adsorbent was synthesized based on nanosized silica-titania modified with alginate within the development of effective adsorbent for heavy metal ions. Effects of metal species Cu(II), Zn(II), Cd(II), and Pb(II); concentrations; pH; temperature; and adsorption onto titania-coated silica (ST20) initial or modified by sodium alginate (ST20-ALG) were studied. The equilibrium and kinetic data of metal ions adsorption were analyzed using Langmuir and Freundlich adsorption models and kinetic models: pseudo first order, pseudo second order, intraparticle kinetic model, and Elovich. The maximum sorption capacities observed were higher for the ST20-ALG composite compared to the initial ST20 oxide for all studied metal ions, namely their values for ST20-ALG were 22.44 mg g for Cu(II) adsorption, 19.95 mg g for Zn(II), 18.85 mg g for Cd(II), and 32.49 mg g for Pb(II). Structure and properties of initial silica-titania ST20 and modified by sodium alginate ST20-ALG adsorbents were analyzed using nitrogen adsorption/desorption isotherms, ATR-FTIR, SEM-EDS, and pHpzc techniques.

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