Study of sorption of chromium(VI) ions by fibre anion-exchangers |
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Authors: | S E Kurashvili A N Barash G D Litovchenko |
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Affiliation: | (1) All-Russian Scientific-Research Institute of Polymer Fibres, Mytishchi |
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Abstract: | Sorption of chromium(VI) ions by fibre anion-exchangers containing pyridine, imidazole, hydrazidine, and aliphatic amino groups
was investigated. It was shown that the basicity of the sorbents has almost no effect on their selectivity in absorption of
chromium ions from solutions. The fibres with pyridine and imidazole groups have higher distribution coefficients, and their
capacity for chromium ions is 130 and 120 mg/g, respectively. Sorption of chromium(VI) ions by the fibre sorbent with pyridine
groups also corresponds to a mixed diffusion mechanism in dynamic conditions and the internal diffusion coefficient is 3.10
−10 cm2/sec. Fibres with low-basicity pyridine groups are resistant to the oxidizing effect of chromium(VI) ions and their exchange
capacity is preserved in repeated sorption-desorption cycles. Conversion of pyridine groups to the form of a strong base decreases
the chemical stability of the sorbent in absorption of chromium(VI) ions from solutions.
Translated from Khimicheskie Volokna, No. 2, pp. 55–57, March–April, 1997. |
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