Quitosana modificada quimicamente

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CHITOSAN CHEMICALLY MODIFIED WITH
M ALEIC ANHYDRIDE AND
ETHYLENEDIAMINE FOR COPPER SORPTION
FROM AQUEOUS MEDIA.
1

1

The solids QM and QMN showed bands at 2573
-1
-1
cm and 1720 cm ,corresponding to the C=O
stretchings of carboxylic acid from anhydride.
-1
The band at 1634 cm is attributed to C=C
stretching, as seen in Figure 1.

K. A. A. PEREIRA , E. C. DA SILVA FILHO , K.
23
S. DE SOUSA , C. AIROLDI

QMN

1

Limav, CCN, UFPI, Teresina-PI, Brasil.
LCCQS, Universidade Federal da Paraíba,
João Pessoa-PB, Brasil.
3
Instituto de Química, Universidade Estadual deCampinas, 13084-971. Campinas, SP.

The elemental analysis results in Table 1 show
that the introduction of maleic anhydride in QM is
illustrated by the increased percentage of carbon
withrespective reduction percentage of nitrogen.
The material QMN shows the increase in nitrogen
content due to the entry of ethylenediamine
molecule.
Table 1. Results of elemental analysis to
chitosanand its derivatives .

QM

Q

4000

3500

3000

2500

2000

1500

Wavenumber / cm

1000

500

-1

Figure 1. Infrared spectra of non-modified
chitosan (Q) and its derivativesQMN and QM.
In Figure 2, the sorption isotherms show that
material QM showed a slight decrease of copper
sorption capacity with respect to Q, as the
material QMN shows a sorption capacity muchgreater than the Q one.
2.4
2.2

QMN

2.0
1.8

Nf ( mmol / g )

Chitosan is a linear copolymer, comprising two
different monomers, 2-acetamide-2-deoxy-Dglucopyranose
and2-amino-2-deoxy-Dglucopyranose linked by glycosidic linkage β-(1
→ 4) [1]. Chitosan is generally obtained by the
alkaline deacetylation of chitin, a polymer that is
naturally occurring polysaccharide and the
secondmost abundant of the planet [2], and only
overcome by cellulose. This biopolymer is widely
studied due to the numerous advantages it offers,
as well as its chemical behavior, chitosan also...
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