Quitosana modificada quimicamente

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.
2
3
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 de
Campinas, 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 with respective 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 chitosan and 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 derivatives QMN 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 much greater 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 and 2-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 second most 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