najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2024-15-3-369-379najo-106Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХMagnetic and photocatalytic properties of BiFeO3 nanoparticles formed during the heat treatment of hydroxides coprecipitated in a microreactor with intense swirling flowsМагнитные и фотокаталитические свойства наночастиц BiFeO3, формирующихся при термообработке соосаждённых в микрореакторе с закрученными потоками гидроксидовhttps://orcid.org/0000-0002-2807-375XПроскуринаО. В.ProskurinaO. V.

Санкт-Петербург

Olga V. Proskurina

St. Petersburg

proskurinaov@mail.ruhttps://orcid.org/0009-0000-2239-7721БабичК. И.BabichK. I.

Санкт-Петербург

Ksenia I. Babich

St. Petersburg

babich3111@gmail.comhttps://orcid.org/0000-0002-9239-5470ТихановаС. М.TikhanovaS. M.

Санкт-Петербург

Sofia M. Tikhanova

St. Petersburg

tihanova.sof@gmail.comhttps://orcid.org/0000-0001-9313-4267МартинсонК. Д.MartinsonK. D.

Санкт-Петербург

Kirill D. Martinson

St. Petersburg

martinsonkirill@mail.ruhttps://orcid.org/0000-0002-7661-9155НеведомскийВ. Н.NevedomskiyV. N.

Санкт-Петербург

Vladimir N. Nevedomskiy

St. Petersburg

nevedom@mail.ioffe.ruhttps://orcid.org/0000-0002-1530-7289СеменовВ. Г.SemenovV. G.

Санкт-Петербург

Valentin G. Semenov

St. Petersburg

val.sem@mail.ruhttps://orcid.org/0000-0003-3571-5770АбиевР. Ш.AbievR. Sh.

Санкт-Петербург

Rufat Sh. Abiev

St. Petersburg

abiev.rufat@gmail.comhttps://orcid.org/0000-0003-4375-6388ГусаровВ. В.GusarovV. V.

Санкт-Петербург

Victor V. Gusarov

St. Petersburg

victor.v.gusarov@gmail.comФизико-технический институт имени А. Ф. Иоффе РАН; Санкт-Петербургский государственный технологический институтIoffe Institute; St. Petersburg State Institute of TechnologyФизико-технический институт имени А. Ф. Иоффе РАНIoffe InstituteСанкт-Петербургский государственный университетSt. Petersburg State University202401062025153369379Copyright © Proskurina O.V., Babich K.I., Tikhanova S.M., Martinson K.D., Nevedomskiy V.N., Semenov V.G., Abiev R.S., Gusarov V.V., 20252025Проскурина О.В., Бабич К.И., Тиханова С.М., Мартинсон К.Д., Неведомский В.Н., Семенов В.Г., Абиев Р.Ш., Гусаров В.В.Proskurina O.V., Babich K.I., Tikhanova S.M., Martinson K.D., Nevedomskiy V.N., Semenov V.G., Abiev R.S., Gusarov V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/106

   In this work, hydroxide deposition in a microreactor with intensively swirling flows was used to obtain BiFeO3, followed by heat treatment of co-precipitated bismuth and iron hydroxides. The study of the formation of nanocrystalline bismuth orthoferrite was carried out using a set of methods: EDXMA, TEM, XRD, 57Fe M¨ossbauer spectroscopy, DRS, etc. The photocatalytic activity and magnetic characteristics of the material were determined. It is shown that during heat treatment of hydroxide precipitation for 1 minute at a temperature of 530 ◦C, BiFeO3 nanocrystals with an average crystallite size of 14 ± 7 nm are formed. It was found that the resulting BiFeO3 nanopowder is represented by agglomerates of individual nanoparticles. The saturation magnetization and residual magnetization values of these bismuth orthoferrite nanoparticles are 2.31 and 0.48 emu/g, respectively. According to the DRS results, band gap energy for the samples calculated at 530, 515, and 500 ◦C were 1.82, 1.86, and 1.91 eV, respectively, which ensures strong absorption of visible light by the samples. The sample showed higher photocatalytic activity in the X-ray amorphous state compared with nanocrystalline BiFeO3 in the process of Fenton-like discoloration of methyl violet under the action of visible light with reaction rate constants of the pseudo-first order 0.0256 and 0.0072 min−1, respectively.

   В работе для получения BiFeO3 использовалось осаждение гидроксидов в микрореакторе с закручивающимися потоками с последующей термообработкой соосажденных гидроксидов висмута и железа. Изучение процесса образования нанокристаллического ортоферрита висмута проводилось с использованием комплекса методов: EDXMA, TEM, XRD, 57Fe Mössbauer spectroscopy, DRS и др. Были определены фотокаталитическая активность и магнитные характеристики материала. Показано, что при термообработке осадков гидроксидов в течение 1 минуты при температуре 530 °C формируются нанокристаллы BiFeO3 со средним размером кристаллитов 14 ± 7 нм. Установлено, что полученный нанопорошок BiFeO3 представлен агломератами отдельных наночастиц. Значения намагниченности насыщения и остаточной намагниченности этих наночастиц ортоферрита висмута равны 2.31 и 0.48 emu/g, соответственно. По результатам DRS установлено, что энергия запрещенной зоны для образцов, прокаленных в 530 °C, 515 °C, и 500 °C составила 1,82 эВ, 1,86 эВ и 1,91 эВ соответственно,, что обеспечивает сильное поглощение видимого света образцами. Более высокую фотокаталитическую активность проявил образец в рентгеноаморфном состоянии по сравнению с нанокристаллическим BiFeO3 в процессе фентоноподобного обесцвечивания метилового фиолетового под действием видимого света с константами скорости реакции псевдопервого порядка 0.0256 мин-1 и 0.0072 мин-1, соответственно.

микрореактор с интенсивно закрученными потокаминанокристаллынаночастицыферрит висмутафотокатализфентоноподобные реакцииmicroreactor with intensively swirling flowsnanocrystalsnanoparticlesbismuth ferritephotocatalysisFenton-like reactionsEDXMA и рентгеноструктурные исследования проводились на оборудовании Инженерного центра Санкт-Петербургского государственного технологического института. Определение характеристик ПЭМ проводилось на оборудовании, принадлежащем Федеральному объединенному исследовательскому центру “Материаловедение и определение характеристик в передовых технологиях”. Работа выполнена при финансовой поддержке Российского научного фонда (проект 20-63-47016)EDXMA and X-ray diffraction studies were performed employing the equipment of the Engineering Center of the St. Petersburg State Institute of Technology. TEM characterization was performed using equipment owned by the Federal Joint Research Center “Material science and characterization in advanced technology”. 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The authors declare that there are no conflicts of interest present.