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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vuzbiochemi</journal-id><journal-title-group><journal-title xml:lang="ru">Известия вузов. Прикладная химия и биотехнология</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of Universities. Applied Chemistry and Biotechnology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2227-2925</issn><issn pub-type="epub">2500-1558</issn><publisher><publisher-name>ИРНИТУ</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21285/2227-2925-2020-10-1-21-28</article-id><article-id custom-type="elpub" pub-id-type="custom">vuzbiochemi-324</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="ru"><subject>ХИМИЧЕСКИЕ НАУКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CHEMICAL SCIENCES</subject></subj-group></article-categories><title-group><article-title>Кислотно-основные свойства кремнийсодержащих соединений, выделенных из хвощей (Equisetum Equisetaceae)</article-title><trans-title-group xml:lang="en"><trans-title>Acid-base  properties of  silicon-containing  compounds isolated from horsetails (Equisetum Equisetaceae)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Арефьева</surname><given-names>О. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Arefieva</surname><given-names>O. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Арефьева Ольга Дмитриевна - кандидат педагогических наук, доцент, ДВФУ; научный сотрудник, ИХ ДВО РАН.</p><p>690950, Владивосток, ул. Суханова, 8;690022, Владивосток, пр-т 100-летия Владивостока, 159д.</p></bio><bio xml:lang="en"><p>Olga D. Arefieva - Cand. Sci. (Pedagogy), Associate Professor, Far Eastern Federal University; Researcher, Institute of Chemistry FEB RAS.</p><p>8 Sukhanov St, Vladivostok 690950; 159, 100-letiya Vladivostoka Ave., Vladivostok 690022.</p></bio><email xlink:type="simple">arefeva.od@dvfu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Пироговская</surname><given-names>П. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Pirogovskaya</surname><given-names>P. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Пироговская Полина Дмитриевна – магистрант, ДВФУ; инженер, ИХ ДВО РАН.</p><p>690950, Владивосток, ул. Суханова, 8;690022, Владивосток, пр-т 100-летия Владивостока, 159д.</p></bio><bio xml:lang="en"><p>Polina D. Pirogovskaya - Master Student, Far Eastern Federal University; Engineer, Institute of Chemistry FEB RAS.</p><p>8 Sukhanov St., Vladivostok 690950; 159 100-letiya Vladivostoka Ave., Vladivostok 690022.</p></bio><email xlink:type="simple">borisova_pd@students.dvfu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Земнухова</surname><given-names>Л. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Zemnukhova</surname><given-names>L. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Земнухова Людмила Алексеевна - доктор химических наук, профессор, главный научный сотрудник.</p><p>690022, Владивосток, пр-т 100-летия Владивостока, 159д.</p></bio><bio xml:lang="en"><p>Liudmila A. Zemnukhova - Dr. Sci. (Chemistry), Professor, Chief Scientist, Institute of Chemistry FEB RAS.</p><p>159 100-letiya Vladivostoka Ave., Vladivostok 690022.</p></bio><email xlink:type="simple">zemnukhova@ich.dvo.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ковехова</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kovekhova</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ковехова Анна Васильевна - кандидат химических наук, доцент, ДВФУ; научный сотрудник, ИХ ДВО.</p><p>690950, Владивосток, ул. Суханова, 8;690022, Владивосток, пр-т 100-летия Владивостока, 159д.</p></bio><bio xml:lang="en"><p>Anna V. Kovekhova - Cand. Sci. (Chemistry), Associated Professor, Far Eastern Federal University; Researcher, Institute of Chemistry FEB RAS.</p><p>8 Sukhanov St., Vladivostok 6909 50;159 100-letiya Vladivostoka Ave., Vladivostok 690022.</p></bio><email xlink:type="simple">kovekhova.av@dvfu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Дальневосточный федеральный университет; Институт химии ДВО РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Far Eastern Federal University; Institute of Chemistry FEB RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Дальневосточный федеральный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Far Eastern Federal University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>01</day><month>04</month><year>2020</year></pub-date><volume>10</volume><issue>1</issue><fpage>21</fpage><lpage>28</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Арефьева О.Д., Пироговская П.Д., Земнухова Л.А., Ковехова А.В., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Арефьева О.Д., Пироговская П.Д., Земнухова Л.А., Ковехова А.В.</copyright-holder><copyright-holder xml:lang="en">Arefieva O.D., Pirogovskaya P.D., Zemnukhova L.A., Kovekhova A.V.</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://vuzbiochemi.elpub.ru/jour/article/view/324">https://vuzbiochemi.elpub.ru/jour/article/view/324</self-uri><abstract><p>В статье приведены результаты исследования кислотно-основных свойств поверхности четырех  кремнийсодержащих  образцов  золы,  полученных  из  наземной  части  хвоща  полевого (E. Arvense L.) различными способами: окислительным обжигом; окислительным обжигом с предварительной обработкой водой или растворами соляной кислоты концентрацией 0,1 или 1,0 моль/л. Показано, что содержание диоксида кремния в образцах изменяется от 33 до 98 % в зависимости от условий переработки сырья. Предварительная обработка сырья раствором кислоты перед обжигом приводит к образованию золы с большим содержанием оксида кремния. Основными примесными элементами являются кальций, калий, магний, алюминий и железо. Образцы, полученные термическим методом и с предварительной обработкой водой, характеризуются большим количеством оксидов щелочноземельных металлов и калия. Дана сравнительная характеристика состояния  поверхности полученных зольных  образцов методами рН-метрии и  Гаммета.  Метод  pH-метрии позволяет оценить интегральную кислотность поверхности, метод Гаммета основан на селективной адсорбции кислотно-основных индикаторов и используется для исследования распределения поверхностных центров по кислотно-основным свойствам. Определены значения рН водной суспензии образцов, которые имеют нейтральную, щелочную или кислую среду в зависимости от схемы переработки тканей растения. Установлено, что поверхность образцов характеризуется наличием льюисовских кислотных (рКа +16,8), бренстедовских основных (рКа +7,15; +9,45) и кислотных (рКа +2,5) активных центров, количество которых определяется их составом. Большое содержание льюисовских кислотных центров в золе связано с атомами кремния. Число центров Бренстеда зависит от схемы обработки хвоща. На поверхности образцов, полученных окислительным обжигом и предварительно обработанных водой, количество бренстедовских активных центров при pKa +2,5 и pKa +9,45 выше по сравнению с золой, выделенной после гидролиза соляной кислотой. Дана сравнительная характеристика кривых распределения кислотно-основных центров кремнийсодержащих образцов золы, полученных из надземной части хвоща полевого и рисовой соломы, указывающая на их сходство.</p></abstract><trans-abstract xml:lang="en"><p>The results of a study into the acid-base surface properties of four silicon-containing ash samples obtained from the above-ground part of the field horsetail plant species (E. arvense L.) are presented. The samples were derived according to various schemes, comprising oxidative roasting both with and without preliminary treatments involving water and solutions of hydrochloric acid having a concentration of 0.1 and 1.0 mol/l. It was shown that the content of silicon dioxide in the samples varies from 33 to 98 % depending on the conditions of processing of raw materials. Preliminary processing of the raw material with an acid solution prior to roasting results in the formation of ash having a high silicon oxide content. The main impurity elements are calcium, potassium, magnesium, aluminum and iron. Samples prepared without preliminary treatment, as well as those treated with water, are characterised by a large amount of alkaline earth metal- and potassium oxides. A comparative characteristic of the surface condition of the obtained ash samples is given using pH measurements and the Hammett acidity function method. The pH measurements allow the integral acidity of the surface to be evaluated, while the Hammett method, based on the selective adsorption of acid-base indicators, is used to study the distribution of surface centres by acid-base properties. The pH values of the aqueous suspensions of neutral, alkaline or acidic samples are determined depending on the plant tissue processing scheme. It was found that the surface of the samples is characterised by the presence of Lewis acid- (pKa +16.8), Brønsted basic- (pKa +7.15; +9.45) and acid- (pKa +2.5) active sites, the amount of which is determined by the composition of the samples. The high content of Lewis acid sites in the ash is associated with silicon atoms. The number of Bronsted sites depends on the horsetail treatment scheme. On the surface of samples obtained by oxidative roasting and those pretreated with water, the number of Brønsted active sites at pKa +2.5 and pKa +9.45 is higher compared to ash isolated following hydrolysis with hydrochloric acid. A comparative characteristic of the distribution curves of acid-base centres of silicon-containing ash samples obtained from the above-ground parts of field horsetail and rice straw is given, indicating their similarity.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>хвощ (Equisetum)</kwd><kwd>зола</kwd><kwd>аморфный кремнезем</kwd><kwd>кислотно-основные свойства</kwd></kwd-group><kwd-group xml:lang="en"><kwd>horsetail (Equisetum)</kwd><kwd>ash</kwd><kwd>amorphous silica</kwd><kwd>acid-base properties</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Sheikh A.S. Silicon to silica bodies and their potential roles: An overview // International Journal of Agricultural Sciences. 2014. Sheikh A.S. Silicon to silica bodies and their potential roles: An over-view // International Journal of Agricultural Sciences. 2014. Vol. 4. Issue 2. 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(In Russian)</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
