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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">catal</journal-id><journal-title-group><journal-title xml:lang="ru">Катализ в промышленности</journal-title><trans-title-group xml:lang="en"><trans-title>Kataliz v promyshlennosti</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1816-0387</issn><issn pub-type="epub">2413-6476</issn><publisher><publisher-name>LLC "KALVIS"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18412/1816-0387-2026-1-98-108</article-id><article-id custom-type="elpub" pub-id-type="custom">catal-1242</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>КАТАЛИЗ И ОХРАНА ОКРУЖАЮЩЕЙ СРЕДЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>СATALYSIS AND ENVIRONMENT PROTECTION</subject></subj-group></article-categories><title-group><article-title>Физико-химические аспекты фотокаталитического разложения катионного и анионного органических красителей в присутствии ионов Na+, Cl–, HCO3–</article-title><trans-title-group xml:lang="en"><trans-title>Physico-chemical aspects of photocatalytic destruction of cationic and anionic organic dyes in the presence of ions: Na+, Cl-, HCO3-</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>Зайцев</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Zaitsev</surname><given-names>A. V.</given-names></name></name-alternatives><email xlink:type="simple">ctls@kalvis.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт тектоники и геофизики имени Ю.А. Косыгина Дальневосточного отделения Российской академии наук, Хабаровск</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Kosygin Institute of Tectonics and Geophysics, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>17</day><month>02</month><year>2026</year></pub-date><volume>26</volume><issue>1</issue><fpage>98</fpage><lpage>108</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; LLC "KALVIS", 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">LLC "KALVIS"</copyright-holder><copyright-holder xml:lang="en">LLC "KALVIS"</copyright-holder><license xlink:href="https://www.catalysis-kalvis.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://www.catalysis-kalvis.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://www.catalysis-kalvis.ru/jour/article/view/1242">https://www.catalysis-kalvis.ru/jour/article/view/1242</self-uri><abstract><p>Рассмотрено влияние концентрации ионов Na+, Cl–, HCO3 – на эффективность фотокаталитического разложения модельных органических загрязнителей: катионный – метиленовый синий (МС); анионный – метиловый оранжевый (МО). Исследована кинетика фоторазложения загрязнителей при концентрациях исследуемых ионов 0, 1, 10, 100, 1000, 10000 мг/л (по кристаллическому веществу) с использованием промышленного фотокатализатора диоксида титана (P25). Оценено время фоторазложения (t) при различных значениях степени превращения (α – 0,1, 0,5 и 0,9) модельных загрязнителей. Рассчитаны константы скорости реакции псевдопервого порядка на линейном участке кинетических кривых. Показано, что при концентрациях исследуемых ионов, превышающих концентрацию загрязнителей более чем в 10 раз, эффективность фоторазложения обоих загрязнителей снижается. Присутствие в растворе НСО3 – аниона значительно сильнее снижает эффективность фоторазложения как катионного, так и анионного загрязнителя по сравнению с Cl– анионам. Исследовано влияние концентрации ионов Na+, Cl–, HCO3 – на степень диспергирования диоксида титана по значениям мутности фотокаталитического раствора на темновой стадии. Показано, что эффективность диспергирования частиц фотокатализатора зависит от соотношения концентрации загрязнителя и концентрации добавляемых ионов.</p></abstract><trans-abstract xml:lang="en"><p>The influence of the concentration of Na+, Cl-, HCO3- ions on the efficiency of photocatalytic destruction of model organic dyes is considered: cationic - methylene blue (MB); anionic - methyl orange (MO). Using monthly monitoring of hydrochemical parameters of polluted rivers of urbanized areas (Khabarovsk, Russia) during 2023, it is shown that the concentration of ions varies in the ranges: 10–450 mg/l for HCO3-; 13–180 mg/l for Na+; 1–360 mg/l for Cl-. The kinetics of photodestruction of model pollutants was studied at concentrations of the studied ions of 0, 1, 10, 100, 1000, 10000 mg/l (for crystalline substance) using the reference photocatalyst titanium dioxide (P25). The photodestruction time (t) was estimated at different values ​​of the conversion degree (α) of model pollutants at: initial – 10%t; middle – 50%t; final – 90%t stages of the photocatalytic process. The pseudo-first-order reaction rate constants were calculated on the linear section of the kinetic curves. The effect of the concentration of Na+, Cl-, HCO3- ions on the degree of titanium dioxide dispersion was studied based on the turbidity values ​​of the photocatalytic solution at the dark stage.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>фотокатализ</kwd><kwd>метиленовый синий</kwd><kwd>метиловый оранжевый</kwd><kwd>ионные примеси</kwd><kwd>мутность фотокаталитического раствора</kwd></kwd-group><kwd-group xml:lang="en"><kwd>photocatalysis</kwd><kwd>water purification</kwd><kwd>ionic composition</kwd><kwd>hydrochemical indicators</kwd><kwd>turbidity</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках госзадания ИТиГ ДВО РАН.</funding-statement><funding-statement xml:lang="en">The work was carried out within the framework of the state assignment of the Institute of Information and Geophysics of the Far Eastern Branch of the Russian Academy of Sciences.</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">Hassimi A. 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