najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2026-17-2-228-235najo-1765Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХRedox behaviour of nanoscale ACe2(PO4)3 (A = NH+4, K+, Rb+) double ceric phosphatesРедокс поведение наноразмерных двойных ортофосфатов церия(IV) состава ACe2(PO4)3 (А = NH4+, K+, Rb+)https://orcid.org/0000-0002-9757-9148КозловаТ. О.KozlovaT. O.

Taisiya O. Kozlova 

Leninsky prospect, 31, Moscow, 119991 

taisiya@igic.ras.ruhttps://orcid.org/0000-0002-5868-4746СозаруковаМ. М.SozarukovaM. M.

Madina M. Sozarukova 

Leninsky prospect, 31, Moscow, 119991 

s_madinam@bk.ruhttps://orcid.org/0000-0003-0620-8016КозловД. А.KozlovD. A.

Daniil A. Kozlov 

Leninsky prospect, 31, Moscow, 119991 

kozlov@igic.ras.ruhttps://orcid.org/0000-0003-3485-1842ШейченкоЕ. Д.SheichenkoE. D.

Ekaterina D. Sheichenko 

Leninsky prospect, 31, Moscow, 119991 

Moscow, Myasnitskaya str., 20, 101000 

edsheychenko@edu.hse.ruhttps://orcid.org/0000-0003-4346-5644БедарьковаА. О.BedarkovaA. O.

Anzhelika O. Bedarkova  

Leninsky prospect, 31, Moscow, 119991

a.bedarkova@igic.ras.ruhttps://orcid.org/0009-0004-3560-4178ВасильеваД. Н.VasilyevaD. N.

Darya N. Vasilyeva 

Leninsky prospect, 31, Moscow, 119991 

Moscow, Myasnitskaya str., 20, 101000 

dnvasileva_1@edu.hse.ruhttps://orcid.org/0000-0002-2378-7446БаранчиковА. Е.BaranchikovA. E.

Alexander E. Baranchikov 

Leninsky prospect, 31, Moscow, 119991 

a.baranchikov@yandex.ruhttps://orcid.org/0000-0003-2343-2140ИвановВ. К.IvanovV. K.

Vladimir K. Ivanov 

Leninsky prospect, 31, Moscow, 119991 

van@igic.ras.ruKurnakov Institute of General and Inorganic Chemistry of the Russian Academy of SciencesRussian FederationKurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences ; HSE UniversityRussian Federation202630042026172228235Copyright © Kozlova T.O., Sozarukova M.M., Kozlov D.A., Sheichenko E.D., Bedarkova A.O., Vasilyeva D.N., Baranchikov A.E., Ivanov V.K., 20262026Козлова Т.О., Созарукова М.М., Козлов Д.А., Шейченко Е.Д., Бедарькова А.О., Васильева Д.Н., Баранчиков А.Е., Иванов В.К.Kozlova T.O., Sozarukova M.M., Kozlov D.A., Sheichenko E.D., Bedarkova A.O., Vasilyeva D.N., Baranchikov A.E., Ivanov V.K.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/1765

A comparative study of the redox behaviour of nanocrystalline isostructural ACe2(PO4)3 (A = NH+4, K+, Rb+) double ceric phosphates was performed. It has been established that with respect to alkylperoxyl radicals or hydrogen peroxide as reactive oxygen species, all the double ceric phosphates acted as antioxidants or prooxidants, respectively. The antioxidant activity towards alkylperoxyl radicals was found to be the higher for the phosphates containing potassium or rubidium. Notably, for KCe2(PO4)3 and RbCe2(PO4)3 an inverse dependence of catalytic activity on concentration in the reaction with H2O2 was found, in contrast to NH4Ce2(PO4)3. The redox behaviour of nanoscale cerium dioxide used for comparison was similar to that of ammonium ceric phosphate, but significantly lower in absolute values. This was explained by the suppressive effect of phosphate anions presented in the buffer solutions.

Проведено сравнительное исследование окислительно-восстановительного поведения нанокристаллических изоструктурных двойных ортофосфатов церия(IV) состава ACe2(PO4)3 (А = NH4+, K+, Rb+). Установлено, что по отношению к алкилпероксильным радикалам или пероксиду водорода в качестве активных форм кислорода все двойные фосфаты церия(IV) действовали как антиоксиданты или прооксиданты, соответственно. Антиоксидантная активность по отношению к алкилпероксильным радикалам оказалась выше у фосфатов, содержащих калий или рубидий. Примечательно, что для KCe2(PO4)3 и RbCe2(PO4)3 была обнаружена обратная зависимость каталитической активности от концентрации в реакции с H2O2, в отличие от NH4Ce2(PO4)3. Окислительно-восстановительное поведение наноразмерного диоксида церия, использованного для сравнения, было аналогично поведению ортофосфата церия(IV)-аммония, но значительно ниже в абсолютных значениях. Это было объяснено подавляющим эффектом фосфат-анионов, присутствующих в буферных растворах.

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The authors declare that there are no conflicts of interest present.