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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">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17586/2220-8054-2018-9-3-401-409</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-815</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>CHEMISTRY AND MATERIAL SCIENCE</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ХИМИЯ И МАТЕРИАЛОВЕДЕНИЕ</subject></subj-group></article-categories><title-group><article-title>Optical properties and photocatalytic activity of nanocrystalline TiO2 doped by 3d-metal ions</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Kolesnik</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Leninskie Hills, 1, Moscow, 119992</p><p>Leninsky avenue, 31, Moscow, 119991</p></bio><email xlink:type="simple">kolesnik.iv@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Lebedev</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Leninskie Hills, 1, Moscow, 119992</p></bio><email xlink:type="simple">vasya_lebedev@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Garshev</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Leninskie Hills, 1, Moscow, 119992</p><p>Leninsky avenue, 49, Moscow, 119334</p></bio><email xlink:type="simple">garshev@inorg.chem.msu.ru</email><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Lomonosov Moscow State University; Institute of General and Inorganic Chemistry</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-2"><institution>Lomonosov Moscow State University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-3"><institution>Lomonosov Moscow State University; Institute of Metallurgy</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>14</day><month>08</month><year>2025</year></pub-date><volume>9</volume><issue>3</issue><fpage>401</fpage><lpage>409</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Kolesnik I.V., Lebedev V.A., Garshev A.V., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Kolesnik I.V., Lebedev V.A., Garshev A.V.</copyright-holder><copyright-holder xml:lang="en">Kolesnik I.V., Lebedev V.A., Garshev 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://nanojournal.ifmo.ru/jour/article/view/815">https://nanojournal.ifmo.ru/jour/article/view/815</self-uri><abstract><p>The influence of impurities on optical and photocatalytic properties was studied in a series of nanocrystalline TiO2 with similar coherent scattering region sizes, phase compositions, surface areas and lattice parameters doped by Fe, Cr, Mn and V ions. Doping leads to an increase of absorption in the visible part of the spectrum due to the formation of additional levels in the band gap. In the case of Fe and Cr ions, d-d transitions are observed, whereas in the case of Mn and V ions, an additional band is associated with the transition from impurity level to Ec. The presence of impurities effectively suppresses photocatalytic activity in the methyl orange decoloration reaction.</p></abstract><kwd-group xml:lang="en"><kwd>titanium oxide</kwd><kwd>nanocrystalline</kwd><kwd>doped TiO2</kwd><kwd>photocatalysis</kwd><kwd>band gap</kwd><kwd>Urbach tail</kwd><kwd>impurity levels</kwd></kwd-group><funding-group><funding-statement xml:lang="en">This work was supported by Russian Science Foundation (research project 17-73-10493). The measurements on Rigaku D/MAX 2500 diffractometer and Zeiss Libra 200 electron microscope were have been done due to the Program of Development of M. V. 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