Journal
CELLULOSE
Volume 19, Issue 3, Pages 913-923Publisher
SPRINGER
DOI: 10.1007/s10570-012-9657-9
Keywords
Cellulose; Cellulose acetate; Anionic copper complexes; Stability constants
Funding
- FAPESP
- CNPq
Ask authors/readers for more resources
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 (SiDbCl(2)), resulting the chemically modified hybrid materials CelAl/SiDbCl(2) and CelacAl/SiDbCl(2). 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 t(Q), as well as the stability constants beta(1) and beta(2), were found for both adsorbents: (a) CelAl/DbCl(2): t(Q) = 0.33 x 10(-3) mol g(-1), log beta(1) = 4.23 (+/- 0.04) and log beta(2) = 6.99 (+/- 0.03); (b) CelacAl/DbCl(2): t(Q) = 0.48 x 10(-3) mol g(-1), log beta(1) = 5.1 (+/- 0.1) and log beta(2) = 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available