Adsorption of anionic dyes on the biopolymer chitin

被引：143

作者：

Longhinotti, E ^{[1
]}

Pozza, F ^{[1
]}

Furlan, L ^{[1
]}

Sanchez, MDND ^{[1
]}

Klug, M ^{[1
]}

Laranjeira, MCM ^{[1
]}

Fávere, VT ^{[1
]}

机构：

[1] Univ Fed Santa Catarina, Dept Quim, Grp Pesquisa Quitinas & Aplicacoes Tecnol, BR-88040900 Florianopolis, SC, Brazil

来源：

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 1998年 / 9卷 / 05期

关键词：

anionic dyes; Langmuir adsorption isotherm; chitin;

D O I：

10.1590/S0103-50531998000500005

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The adsorption of the anionic dyes orange IV, orange G and xylenol orange on chitin was studied, employing the Langmuir isotherm. The adsorption parameters were determined utilizing various linear regressions of the isotherm. The results showed that the adsorption capacity is dependent on pH. In acid pH, the polymer amino groups are protonated and the polymer chain is positively charged, with a predominance of adsorption through ion exchange. Van der Waals adsorption, as well as adsorption through hydrogen bonding, is also likely to occur to some extent. For xylenol orange, a linear regression was found, with an angular coefficient of 0.726 L mg(-1). The temperature increase reduces adsorption capacity by chitin, due to the enhancement of the desorption step in the mechanism. Delta H values of -10.9 kJ mol(-1) for orange G and -28.9 kJ mol(-1) for orange IV prove the physical nature of the adsorption by these dyes on the chitin surface.

引用

页码：435 / 440

页数：6

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[2]

Benszedits S, 1980, AM DYEST REP, V69, P37

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