Adsorption of Cr(VI) and Speciation of Cr(VI) and Cr(III) in Aqueous Solutions Using Chemically Modified Chitosan

International Journal of Environmental Research and Public Health

Jun Dai¹  FengLian Ren¹ 

[1] College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China;

关键词: grafting chitosan;    speciation;    flame atomic absorption spectrometry;    chromium;   

DOI  :  10.3390/ijerph9051757

来源: mdpi

【 摘 要 】

A new type of grafting chitosan (CTS) was synthesized using 2-hydroxyethyl- trimethyl ammonium chloride (HGCTS). The adsorption of Cr(VI) on HGCTS was studied. The effect factors on adsorption and the adsorption mechanism were considered. The results indicated that the HGCTS could concentrate and separate Cr(VI) at pH 4.0; the adsorption equilibrium time was 80 min; the maximum adsorption capacity was 205 mg/g. The adsorption isotherm and kinetics were investigated, equilibrium data agreed very well with the Langmuir model and the pseudo second-order model could describe the adsorption process better than the pseudo first-order model. A novel method for speciation of Cr(VI) and Cr(III) in environmental water samples has been developed using HGCTS as adsorbent and FAAS as determination means. The detection limit of this method was 20 ng/L, the relatively standard deviation was 1.2% and the recovery was 99%~105%.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.