Introduction of copper nanoparticles in chitosan matrix as strategy to enhance chromate adsorption

de Godoi, Fernanda Condi, Rabelo, Rodrigo Balloni, Silva, Maria Aparecida, Rodriguez-Castellon, Enrique, Guibal, Eric and Beppu, Marisa Masumi (2014) Introduction of copper nanoparticles in chitosan matrix as strategy to enhance chromate adsorption. Chemical Engineering and Processing: Process Intensification, 83 43-48. doi:10.1016/j.cep.2014.07.002


Author de Godoi, Fernanda Condi
Rabelo, Rodrigo Balloni
Silva, Maria Aparecida
Rodriguez-Castellon, Enrique
Guibal, Eric
Beppu, Marisa Masumi
Title Introduction of copper nanoparticles in chitosan matrix as strategy to enhance chromate adsorption
Journal name Chemical Engineering and Processing: Process Intensification   Check publisher's open access policy
ISSN 0255-2701
1873-3204
Publication date 2014-09-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.cep.2014.07.002
Open Access Status DOI
Volume 83
Start page 43
End page 48
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
In this study, copper nanoparticles (CuNPs) were incorporated to chitosan (CHI) matrix as strategy to enhance the chromate adsorption by CHI membrane. The CuNPs were synthesized using NaBH4 as the reducing agent. Dispersive X-ray Absorption Spectroscopy (DXAS) was used to monitor the in situ reduction of Cu(II). The influence of the presence of CuNPs on the hygroscopic behavior was also evaluated. DXAS technique showed that the adsorbed Cu(II) was reduced to Cu(I) (63%) and Cu(0) (37%) species, at the end of the reduction reaction (using NaBH4, after ~30min). The hygroscopic behavior of the proposed sorbent was more influenced by CuNPs when the water vapor adsorption was conducted under synthetic air atmosphere. A decrease in the energy of interaction among the water molecules adsorbed on the monolayer was observed. The chromate adsorption study has shown a higher equilibrium concentration of adsorbed chromium species when the CHI membrane containing CuNPs was used as sorbent. The CuNPs offered a second active adsorption site, which was characterized by a higher coefficient of affinity (12Lmmol-1, against 0.18Lmmol-1 reported for CHI). The enhanced adsorption of chromium in the presence of CuNPs was associated to the redox reaction between the CuNPs and chromate anions.
Keyword Chitosan
Copper nanoparticles
DXAS
Hygroscopic behavior
Cr(VI) adsorption
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID Process 4575-11-3
Process 142247/2009-0
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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