Original Paper

Cellulose

, Volume 19, Issue 3, pp 913-923

First online:

New promising composite materials useful in the adsorption of Cu(II) in ethanol based on cellulose and cellulose acetate

  • Hérica A. MagossoAffiliated withDepartment of Chemistry, Santa Catarina Federal University
  • , Natália FattoriAffiliated withInstitute of Chemistry, State University of Campinas, UNICAMP
  • , Leliz T. ArenasAffiliated withInstitute of Chemistry, Rio Grande do Sul Federal University
  • , Yoshitaka GushikemAffiliated withInstitute of Chemistry, State University of Campinas, UNICAMP Email author 

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Abstract

This work describes for the first time the synthesis and characterization of new promising materials based on cellulose (Cel) and cellulose acetate (Celac), previously modified with aluminum oxide (CelAl and CelacAl) and post functionalized with 1,4-diazabicyclo [2.2.2] octane-n-propyltrimethoxysilane chloride (SiDbCl2), resulting the chemically modified hybrid materials CelAl/SiDbCl2 and CelacAl/SiDbCl2. The materials have shown to be useful in the adsorption of CuCl2 from ethanol, presenting high effective adsorption capacity. In the adsorption process, the copper ions diffuse into the solid solution interface and are retained as anionic complexes CuCl 3 or CuCl 4 2− . An expressive effective adsorption capacity tQ, as well as the stability constants β1 and β2, were found for both adsorbents: (a) CelAl/DbCl2: tQ = 0.33 × 10−3 mol g−1, log β1 = 4.23 (±0.04) and log β2 = 6.99 (±0.03); (b) CelacAl/DbCl2: tQ = 0.48 × 10−3 mol g−1, log β1 = 5.1 (±0.1) and log β2 = 8.3 (±0.1). Both adsorbent materials are potentially useful in the pre-concentration and further analysis of Cu(II) present in trace amounts in ethanol, extensively used as an automotive fuel in Brazil. Regeneration of the adsorbents requires a very simple procedure consisting in their immersion in aqueous solution which causes the immediate release of the Cu(OH2) n 2+ species to the solution phase.

Keywords

Cellulose Cellulose acetate Anionic copper complexes Stability constants