Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2012 May;9(5):1757-70.
doi: 10.3390/ijerph9051757. Epub 2012 May 7.

Adsorption of Cr(VI) and speciation of Cr(VI) and Cr(III) in aqueous solutions using chemically modified chitosan

Jun Dai  1 , FengLian Ren, ChunYuan Tao
Affiliations

Adsorption of Cr(VI) and speciation of Cr(VI) and Cr(III) in aqueous solutions using chemically modified chitosan

Jun Dai et al. Int J Environ Res Public Health. 2012 May.

Abstract

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%.

Keywords: chromium; flame atomic absorption spectrometry; grafting chitosan; speciation.

PubMed Disclaimer

Figures

Scheme 1
Scheme 1
Preparation of HGCTS.
Figure 1
Figure 1
IR spectra of CTS and HGCTS.
Figure 2
Figure 2
SEM images of (A) CTS and (B) HGCTS.
Figure 3
Figure 3
Effect of pH on the adsorption of Cr(VI) and Cr(III).
Figure 4
Figure 4
Pseudo first-order kinetic plots for the adsorption of Cr(VI).
Figure 5
Figure 5
Pseudo second-order kinetic plots for the adsorption of Cr(VI).
Figure 6
Figure 6
Adsorption isotherm of Cr(VI) on HGCTS.
See this image and copyright information in PMC

Similar articles

See all similar articles

Cited by

See all "Cited by" articles

References

    1. Kot A., Namiesnik J. The role of speciation in analytical chemistry. Trends Anal.Chem. 2000;19:69–79. doi: 10.1016/S0165-9936(99)00195-8. - DOI
    1. Demirhan C., Mustafa T., Mustafa S. Speciation of Mn(II), Mn(VII) and total manganese in water and food samples by coprecipitation-atomic absorption spectrometry combination. J. Hazard. Mater. 2010;173:773–777. doi: 10.1016/j.jhazmat.2009.09.004. - DOI - PubMed
    1. Kotas J., Stasicka Z. Chromium occurrence in the environment and methods of its speciation. Environ. Pollut. 2000;107:263–283. doi: 10.1016/S0269-7491(99)00168-2. - DOI - PubMed
    1. Shanker A.K., Cervantes C., Loza-Tavera H., Avudainayagam S. Chromium toxicity in plants. Environ. Int. 2005;31:739–753. doi: 10.1016/j.envint.2005.02.003. - DOI - PubMed
    1. Zhitkovich A. Importance of chromium-DNA adducts in mutagenicity and toxicity of chromium(VI) Chem. Res. Toxicol. 2005;18:3–11. doi: 10.1021/tx049774+. - DOI - PubMed

Publication types