Adsorption of Ni(II), Cu(II) and Cd(II) from aqueous solutions by amino modified nanostructured microfibrillated cellulose

Sanna Hokkanen, Eveliina Repo, Terhi Suopajärvi, Henrikki Liimatainen, Jouko Niinimaa, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review

223 Citations (Scopus)

Abstract

The aim of the present study was to investigate the adsorption properties of aminopropyltriethoxysilane (APS) modified microfibrillated cellulose (MFC) in aqueous solutions containing Ni(II), Cu(II) and Cd(II) ions. The modified adsorbents were characterized using elemental analysis, Fourier transform infrared spectroscopy, SEM and zeta potential analysis. The adsorption and regeneration studies were conducted in batch mode using various different pH values and contact times. The maximum removal capacities of the APS/MFC adsorbent for Ni(II), Cu(II), and Cd(II) ions were 2.734, 3.150 and 4.195 mmol/g, respectively. The Langmuir, Sips and Dubinin-Radushkevich models were representative to simulate adsorption isotherms. The adsorption kinetics of Ni(II) Cu(II), and Cd(II) adsorption by APS/MFC data were modeled using the pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetics equations. The results indicate that the pseudo-second-order kinetic equation and intra-particle diffusion model were adequate to describe the adsorption kinetics.

Original languageEnglish
Pages (from-to)1471-1487
Number of pages17
JournalCellulose
Volume21
Issue number3
DOIs
Publication statusPublished - Jun 2014
Externally publishedYes

Keywords

  • Adsorption
  • Heavy metal removal
  • Nanocellulose
  • Surface modification
  • Wastewater treatment

ASJC Scopus subject areas

  • Polymers and Plastics

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