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

Nanoscale Research Letters

O. Goncharuk¹  D. Kołodyńska²  M. Gęca²  E. Skwarek³ 

[1] Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine;Department of Inorganic Chemistry, Faculty of Chemistry, Maria Curie Skłodowska University;Department of Radiochemistry and Colloid Chemistry, Faculty of Chemistry, Maria Curie Skłodowska University;

关键词: Adsorption;    Heavy metal species;    Nanocomposite;    Titania;    Silica;    Sodium alginate;   

DOI  :  10.1186/s11671-018-2512-7

来源: DOAJ

【 摘 要 】

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− 1 for Cu(II) adsorption, 19.95 mg g− 1 for Zn(II), 18.85 mg g− 1 for Cd(II), and 32.49 mg g− 1 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.

【 授权许可】

Unknown