Ivanovo, Ivanovo, Russian Federation
Ivanovo, Ivanovo, Russian Federation
The paper concerns the sorption of heavy metal ions from aqueous solutions by cellulose sorbents agents. We modified the wood cellulose by polyvinylpyrrolidone and carboxylic acids. Also we studied the equilibrium and kinetics of Cu(II), Co(II) and Ni(II) ions sorption from aqueous solutions by native and modified cellulose samples. We treated the sorption isotherms under study according to Langmuir models and theory for volume filling of micropores. The Langmuir model is the most correct one for description of the process of heavy metal ions sorption by cellulose sorbents agents. According to the study, the maximum sorption capacity of the modified sorbents is 1.5-2 times higher than the maximum sorption capacity of the native cellulose. The samples obtained can be arranged in the following order of increasing ultimate sorption capacity (A∞): native cellulose < polyvinylpyrrolidone-modified pulp < citric acid-modified pulp. In addition, we studied the influence of media acidity on the sorption of heavy metal ions in pH 1-7. We observed a significant increase in the pH of the initial solution from 1 to 6; there is a rapid increase of the degree of extraction of Cu(II), Cu(II) and Ni(II) ions. Experimentally we obtained the IR spectra of native wood cellulose and its samples modified by polyvinylpyrrolidone and citric acid. Also the authors made an elemental analysis of all types of modified sorbents.
cellulose, modification, heavy metal ions, isotherms, sorption kinetics
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