Vanadium interactions with chitosan:: Influence of polymer protonation and metal speciation

被引：117

作者：

Guzmán, J

Saucedo, I

Navarro, R

Revilla, J

Guibal, E

机构：

[1] Ecole Mines Ales, Lab Genie Environm Ind, F-30319 Ales, France

[2] Univ Guanajuato, Inst Invest Cientif, Guanajuato 36040, Gto, Mexico

[3] Ctr Invest & Desarrollo, Mexico City 52000, DF, Mexico

来源：

LANGMUIR | 2002年 / 18卷 / 05期

关键词：

D O I：

10.1021/la010802n

中图分类号：

O6 [化学];

学科分类号：

0703 [化学];

摘要：

Chitosan is very efficient at removing vanadium from dilute solutions: sorption capacity can reach 400-450 mg V g(-1) under optimum experimental conditions, which correspond to pH 3. In acidic solutions, the chitosan's amine groups are protonated, and vanadate anions can be exchanged with counterions bound to -NH3+ sites. A correlation is observed between the speciation diagram and the sorption isotherms, and it appears that decavanadate species are more favorable to sorption than other anionic vanadate species. Selecting experimental conditions under which decavanadate ions are the predominant form of vanadium results in enhanced sorption capacities and improved sorption kinetics. The results obtained in the study of vanadate desorption confirm the high affinity of chitosan for these polyoxoanions.

引用

页码：1567 / 1573

页数：7

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