ADSORPTION OF CU (II) AND CR (VI) IONS BY CHITOSAN: KINETICS AND EQUILIBRIUM STUDIES
By R. Schmuhl, H. Krieg, K. Keizer. 2004
398 citations recorded by the source corpus.
The ability of chitosan as an adsorbent for Cu (II) and Cr (VI) ions in aqueous solution was studied. The experiments were don e as batch processes. Equilibrium studies were done on both cross-linked and non-cross-linked chitosan for both metals. Cr (VI) adsorption behaviour could be described using the Langmuir isotherm over the whole concentration range of 10 to 1000 mg· l -1 Cr. The maximum adsorption capacity for both types of chitosan was found to be 78 mg·g -1 for the non-cross-linked chitosan and 50 mg·g -1 for the cross-linked chitosan for the Cr (VI) removal. For the Cu (II) removal the Freundlich isotherm described the experimental data over the whole concentration range of 10 to 1000 mg·l-1 Cu (II). The maximum adsorption capacity for both types of chitosan can be estimated to be greater than 80 mg·g -1 . Cr (VI) removal was the highest at pH 5 but pH did not have a large influence on Cu (II). From these results it is clear that the adsorption of heavy metals is possible with chitosan, but that with this m ethod, end concentrations of below 1 mg·l-1 can hardly be obtained.
Subfields: Water Science and Technology
View Paper: https://www.semanticscholar.org/paper/2cd0ae894230fb568f0822301d2cd296f9b0ad7e
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In Water Science and Technology
Citations in the corpus
- Application of Chitosan for the Removal of Metals From Wastewaters by Adsorption—Mechanisms and Models Review (2007, background): “The generalized separation factors can be expressed in simpler equations (110), (111), and (112).”
- Heavy metal biosorption by chitin and chitosan isolated from Cunninghamella elegans (IFM 46109) (2004, background): “Recent researches in the field of heavy metals removal from wastewaters and sediments have focused on the development of materials with increased affinity, capacity and selectivity for target metals (9,16).”
- Removal of heavy metal from industrial wastewater using chitosan coated oil palm shell charcoal (2005, result): “This adsorption capacity for chromium is considerably higher compared to the values obtained with other adsorbents (50 to 120 mg/g) (Schmuhl et al. 2001).”
- Sorption isotherms and kinetics of chromium uptake from wastewater using natural sorbent material (2009, background): “control over the ionization of surface functional groups, the degree of ionization and the speciation of the sorbate species (Krieg et al., 2001).”