From Chemistry Towards Technology Step-By-Step From Chemistry Towards Technology Step-By-Step От химии к технологии шаг за шагом 2782-1900 82428 10.52957/27821900_2022_01_76 Научные статьи Scientific articles Научные статьи Sorption of heavy metal ions from aqueous solutions by cellulose sorbent agent Sorption of heavy metal ions from aqueous solutions by cellulose sorbent agent Никифорова Татьяна Евгеньевна Nokoforova Tatyana Evgenjevna tatianaenik@mail.ru

доктор химических наук;

doctor of chemical sciences;

 Вокурова Дарья Андреевна Vokurova Daria Andreevna fresh-limon@mail.ru Ивановский государственный химико-технологический университет Ivanovo State University of Chemistry and Technology 23 03 2022 23 03 2022 3 1 76 87 16 12 2021 21 03 2022 https://chemintech.ru/en/nauka/article/82428/view

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 vol-ume 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. Experimental-ly we obtained the IR spectra of native wood cellulose and its samples modified by poly-vinylpyrrolidone and citric acid. Also the authors made an elemental analysis of all types of modified sorbents.

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 vol-ume 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. Experimental-ly we obtained the IR spectra of native wood cellulose and its samples modified by poly-vinylpyrrolidone and citric acid. Also the authors made an elemental analysis of all types of modified sorbents.

 cellulose modification heavy metal ions isotherms sorption kinetics The study was carried out using the resources of the Center for Shared Use of Scientific Equipment of the ISUCT (with the support of the Ministry of Science and Higher Education of Russia, grant No. 075-15-2021-671). This work was funded by the Ministry of Science and Higher Education of the Russian Federation (Project No. FZZW–2020–0010).

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