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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">chemicallytech</journal-id><journal-title-group><journal-title xml:lang="en">Fine Chemical Technologies</journal-title><trans-title-group xml:lang="ru"><trans-title>Тонкие химические технологии</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2410-6593</issn><issn pub-type="epub">2686-7575</issn><publisher><publisher-name>MIREA – Russian Technological University (RTU MIREA).</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32362/2410-6593-2024-19-3-183-191</article-id><article-id custom-type="edn" pub-id-type="custom">UAXSVB</article-id><article-id custom-type="elpub" pub-id-type="custom">chemicallytech-2083</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>THEORETICAL BASIS OF CHEMICAL TECHNOLOGY</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ТЕОРЕТИЧЕСКИЕ ОСНОВЫ ХИМИЧЕСКОЙ ТЕХНОЛОГИИ</subject></subj-group></article-categories><title-group><article-title>Concentration of heavy metal ions from aqueous media under dynamic conditions using a composite sorbent based on chitosan and silica</article-title><trans-title-group xml:lang="ru"><trans-title>Концентрирование ионов тяжелых металлов из водных сред в динамических условиях композиционным сорбентом на основе хитозана и диоксида кремния</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1712-9121</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Габрин</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Gabrin</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Габрин Виктория Александровна, аспирант кафедры технологии пищевых продуктов и  биотехнологии</p><p>153000, г. Иваново, Шереметевскийпр-т, д. 7</p><p>Scopus Author ID 58398403100</p></bio><bio xml:lang="en"><p>Victoria A. Gabrin, Postgraduate Student, Department of Food Technology and Biotechnology</p><p>7, Sheremetevskii pr., Ivanovo, 153000</p><p>Scopus Author ID 58398403100</p></bio><email xlink:type="simple">gabrinvictoria@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0817-9258</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Никифорова</surname><given-names>Т. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Nikiforova</surname><given-names>T. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Никифорова Татьяна Евгеньевна, д.х.н., доцент  кафедры технологии пищевых продуктов и  биотехнологии</p><p>153000, г. Иваново, Шереметевский пр-т, д. 7</p><p>Scopus Author ID 7006694263, ResearcherID N-1026-2017</p></bio><bio xml:lang="en"><p>Tatiana E. Nikiforova, Dr. Sci. (Chem.), Associate Professor, Department of Food Technology and  Biotechnology</p><p>7, Sheremetevskii pr., Ivanovo, 153000</p><p>Scopus Author ID 7006694263, ResearcherID N-1026-2017</p></bio><email xlink:type="simple">tatianaenik@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1034-4339</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Козлов</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kozlov</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Козлов Владимир Александрович, д.х.н.,  профессор кафедры химии и технологии  высокомолекулярных соединений</p><p>153000, Россия, г. Иваново, Шереметевский пр-т, д. 7</p><p>Scopus Author ID 57196498026</p></bio><bio xml:lang="en"><p>Vladimir A. Kozlov, Dr. Sci. (Chem.), Full Professor, Department of Chemistry and Technology of  Macromolecular Compounds</p><p>7, Sheremetevskii pr., Ivanovo, 153000</p><p>Scopus Author ID 57196498026</p></bio><email xlink:type="simple">kozlov@isuct.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0514-5770</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Разговоров</surname><given-names>П. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Razgovorov</surname><given-names>P. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Разговоров Павел Борисович, д.т.н., профессор, начальник управления организации научно-исследовательской и интеллектуальной деятельности</p><p>150023, г. Ярославль, Московский пр-т, д. 88</p><p>Scopus Author ID 17344647700</p></bio><bio xml:lang="en"><p>Pavel B. Razgovorov, Dr. Sci. (Eng.), Professor, Head of  the Department for the Organization of Research and  Intellectual Activities</p><p>88, Moskovskii pr., Yaroslavl, 150023</p><p>Scopus Author ID 17344647700</p></bio><email xlink:type="simple">razgovorovpb@ystu.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Ивановский государственный химико­-технологический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ivanovo State University of Chemistry and Technology</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Ярославский государственный технический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Yaroslavl State Technical University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>05</day><month>07</month><year>2024</year></pub-date><volume>19</volume><issue>3</issue><fpage>183</fpage><lpage>191</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Gabrin V.A., Nikiforova T.E., Kozlov V.A., Razgovorov P.B., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Габрин В.А., Никифорова Т.Е., Козлов В.А., Разговоров П.Б.</copyright-holder><copyright-holder xml:lang="en">Gabrin V.A., Nikiforova T.E., Kozlov V.A., Razgovorov P.B.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.finechem-mirea.ru/jour/article/view/2083">https://www.finechem-mirea.ru/jour/article/view/2083</self-uri><abstract><p>Objectives. The study set out to investigate the sorption, toxicological, and regeneration properties of a composite sorbent based on chitosan hydrogel and unsuspended silicon dioxide (chitosan–colloidal silica), which manifest themselves under dynamic conditions of purification of aqueous solutions, as a means of removing heavy metal ions.Methods. The total dynamic exchange capacity of a chitosan–colloidal silica composite sorbent was evaluated under dynamic sorption conditions by passing solutions containing Zn(II), Cd(II), Cu(II), and Cr(III) ions having a concentration of 240–251 mg/L through a fixed sorption bed. The method for determining acute toxicity using daphnia (Daphnia magna Straus) is based on the direct calculation of the mortality of daphnia exposed to toxic substances contained in the test aqueous extract in comparison with a reference culture in samples that do not contain toxic substances. The regeneration ability of the sorbent was assessed by counting the number of sorption–desorption cycles using 0.1 M NaOH and 0.1 M NaHCO3 eluents, as well as aqueous solutions of H2O2 (1 and 3%).Results. The effectiveness of the chitosan–colloidal silica composite sorbent in the process of dynamic purification of aqueous media to remove Cu(II), Zn(II), Cd(II), and Cr(III) ions was established. After determining the times of ion breakthrough and saturation of the developed sorbent, its dynamic exchange capacity was calculated by processing the kinetic curves of sorption of heavy metal ions under dynamic conditions. The results of regeneration of the sorbent were presented in the context of the possibility of its reuse. It is shown that the sorbent can withstand up to five sorption–desorption cycles while maintaining a level copper cation extraction above 90%.Conclusions. Analysis of the kinetic curves demonstrated that the driving force behind the removal of heavy metals from aqueous media by means of the obtained sorbent is the external diffusion mass transfer of ions from the mobile phase of the solution. Biotesting of samples showed that the developed chitosan-based sorbent does not have acute toxicity.</p></abstract><trans-abstract xml:lang="ru"><p>Цели. Изучение сорбционных, токсикологических и регенерационных свойств композиционного сорбента на основе гидрогеля хитозана и несуспендированного диоксида кремния («хитозан–коллоидный кремнезем»), проявляющихся в динамических условиях очистки водных растворов от ионов тяжелых металлов.Методы. Полную динамическую обменную емкость композиционного сорбента «хитозан–коллоидный кремнезем» оценивали в условиях динамической сорбции, пропуская через неподвижный сорбционный слой растворы, содержащие ионы Zn(II), Cd(II), Cu(II) и Cr(III) с концентрацией 240–251 мг/л. Метод определения острой токсичности с использованием дафний (Daphnia magna Straus) основан на прямом счете процента смертности дафний при воздействии токсических веществ, присутствующих в исследуемой водной вытяжке, по сравнению с контрольной культурой в пробах, не содержащих токсических веществ. Оценку регенерационной способности сорбента определяли фиксированием количества циклов сорбции–десорбции с использованием элюентов — 0.1 М NaOH, 0.1 М NaHCO3, а также водных растворов H2O2 (1 и 3%).Результаты. Установлена эффективность работы композиционного сорбента «хитозан–коллоидный кремнезем» в процессе динамической очистки водных сред от ионов Cu(II), Zn(II), Cd(II) и Cr(III). Определены времена проскока ионов и насыщения разработанного сорбента и рассчитана его динамическая обменная емкость путем обработки кинетических кривых сорбции ионов тяжелых металлов, снятых при осуществлении сорбции в динамических условиях. Представлены результаты регенерации и возможность повторного использования сорбента, который способен выдерживать до пяти циклов сорбции–десорбции с сохранением степени извлечения катионов меди выше 90%.Выводы. Анализ кинетических кривых показал, что движущей силой динамической очистки водных сред от тяжелых металлов полученным сорбентом является внешнедиффузионный массоперенос ионов из подвижной фазы раствора. Биотестирование образцов показало, что разработанный сорбент на основе хитозана не обладает острой токсичностью.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>адсорбция</kwd><kwd>тяжелые металлы</kwd><kwd>хитозан</kwd><kwd>композиты</kwd><kwd>биотестирование</kwd><kwd>регенерация</kwd></kwd-group><kwd-group xml:lang="en"><kwd>heavy metals</kwd><kwd>adsorption</kwd><kwd>composites</kwd><kwd>chitosan</kwd><kwd>biotesting</kwd><kwd>regeneration</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование проведено в рамках государственного задания на выполнение НИР (тема № FZZW-2024-0004) с использованием ресурсов Центра коллективного пользования научным оборудованием Ивановского государственного химико-технологического университета (при поддержке Министерства науки и высшего образования Российской Федерации, грант № 075-15-2021-671).</funding-statement><funding-statement xml:lang="en">The study was carried out within Research State Program (No. FZZW-2024-0004) using the resources of the Center for Shared Use of Scientific Equipment of Ivanovo State University of Chemistry and Technology (with the support of the Ministry of Science and Higher Education of Russian Federation, grant No. 075-15-2021-671).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Dinu M.V., Humelnicu D., Lazar M.M. 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