Enhanced copper(II) biosorption on SiO2-alginate gel composite: A mechanistic study with surface characterization

Yalcin S., Apak R., Boz İ.

KOREAN JOURNAL OF CHEMICAL ENGINEERING, cilt.32, sa.10, ss.2116-2123, 2015 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 32 Sayı: 10
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1007/s11814-015-0051-9
  • Dergi Adı: KOREAN JOURNAL OF CHEMICAL ENGINEERING
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2116-2123
  • Anahtar Kelimeler: Alginate-SiO2 Biocomposite, Cu(II) Adsorption, FTIR-XPS Analyses, Surface Characterization, HEAVY-METAL BIOSORPTION, CALCIUM ALGINATE BEADS, ACTIVATED CARBON, ADSORPTION, BIOMASS, REMOVAL, SILICA, ALGAE, FTIR, XPS
  • İstanbul Üniversitesi-Cerrahpaşa Adresli: Hayır

Özet

A new SiO2-alginate biocomposite was synthesized with improved mechanical properties, showing chelation capability of divalent metal ions, especially Cu(II), through its carboxylic acid ends. The biocomposite was characterized using scanning electron microscopy (SEM), Fourier-transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) techniques. The adsorption of copper(II) onto both H- and Ca-forms of sorbent was investigated as a function of pH and contact time, and adsorption data were modeled with the aid of Langmuir and Freundlich isotherms. The release of Ca(II) ions accompanying copper(II) binding was evaluated by selective surface complexation concept involving ion-exchange. The IR spectra gave detailed information on complexation of carbonyl group with copper ions and on the relative contribution of SiO2 involved in copper uptake. The adsorption edge of copper was within the pH range 4.0-5.5, and the sorbent capacity was determined as 1.85 and 1.10 mmolg(-1) for H- and Ca-forms, respectively.