Sorption of ions Cu(II) by activated carbon BAU-A
Abstract
The sorption properties of activated carbon BAU-A in the relation of copper ions were studied. The study was carried out using a model solution of sulfate of copper(II) containing additionally 400 mg/l of sodium sulfate. It was shown that activated carbon BAU-A may remove copper ions from polluted waters due to their physical adsorption on the surface of BAU-A, and the sorption process is well described by the Langmuir equation. The parameters of this equation were determined at different pH of the model solution. The capacity of an adsorption monolayer of BAU-A increases when рН of the solution grows from 4 to 6.7 (the ranges of рН<4 and рН>6.7 have not been investigated), and the sorption equilibrium constant on the contrary decreases. So, at рН=4 the adsorptive capacity of the monolayer of the BAU-A for ions of copper(II) is 0.911 mg/g (or 0.00092 mg/m2), and the constant of the adsorptive balance is equal to 0.963 dm3/mg. At рН=5 it was found 1.573 mg/g (or 0.00160 mg/m2), and 1.197 dm3/mg, respectively. At рН=6 - 2.517 mg/g (or 0.00256 mg/m2), and 0.788 dm3/mg. At рН=6.7 - 7.163 mg/g (or 0.00727 mg/m2), and 0.394 dm3/mg.
Comparison of IR and Raman spectra of BAU-A and other carbon sorbent MIU-C showed that the differences in their sorption properties with respect to copper ions are due to differences in the properties of their surfaces, as well as to their structure. So, IR and Raman spectres showed that in the BAU-A carbon is in an amorphous state, and in IR spectrum of the MIU-C bands of absorption of water, hydroxyl groups OH and bonds of C-H are found that demonstrates presence at this sorbent of alcohols.
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References
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