Dr. Diana G. Fukina was born in 1993, obtained M.Sc. degree in 2016 and Ph.D. in 2020. She currently serves as Head of the Laboratory of Inorganic Materials at Lobachevsky State University of Nizhny Novgorod. The field of her research interest is synthesis and characterization of new inorganic compounds based on pyrochlore structure type. The several last years the investigations have been devoted to study of photocatalytic ability of the prepared materials, including improving the effectiveness for wastewater purification. Moreover, she delivers lectures and conducts seminars and laboratory classes in the fields of "Research Methods of Solid State materials", "Structure of Matter" and "Radiochemistry and Radioecology" at the Department of Solid State Chemistry in Lobachevsky University.Dr. Artem S. Belousov was born in 1988 and obtained his M.Sc. degree in 2011 and Ph.D. in 2016. He currently serves as Senior Researcher of the Laboratory of High-Purity Materials at Lobachevsky State University of Nizhny Novgorod. His research focuses on designing heterogeneous photocatalysts based on complex oxides with pyrochlore and perovskite structures for degrading organic pollutants and desulfurizing fuels. Dr. Belousov has authored more than 25 articles in reputable journals such as GreenChemistry, Sustainable Energy & Fuels, Materials Today Chemistry, Journal of Environmental Chemistry Engineering, and Environmental Research. Furthermore, he works as Associate Professor at the Department of Solid State Chemistry in Lobachevsky University, where he delivers lectures and conducts seminars and laboratory classes in the fields of "Chemical Engineering," "Processes and Devices for Chemical Production," and "Materials Science and Engineering".Prof. Dr. Evgeny V. Suleimanov was born in 1968, obtained Ph.D. in 1994 and Doctor of Sciences in 2003. He currently serves as the Head of the Research Institute for Chemistry at Lobachevsky State University of Nizhny Novgorod. The field of his research interest is synthesis and characterization of inorganic compounds based on pyrochlore structure type, including thermodynamic investigation. Moreover, he supervises the study of pyrochlore oxides for different photocatalytic processes, including decomposition of organic pollutants, antifungal and antibacterial effect, and radical polymerization. He is the Head of the Department of Solid State Chemistry in Lobachevsky University and delivers lectures in the fields of "Material Sciences", "Research Methods of Solid State materials" and "Structure of Matter".

• Preface.- 1. Structural Type of α-Pyrochlore Oxides.- 2. Structural Type of β-Pyrochlore Oxides AM2O6.- 3. Theoretical Foundations of Photocatalysis.- 4. Application of Compounds with Pyrochlore Structure in Photocatalysis.- 5. Synthesis of Composites Based on Natural and Synthetic Polymers as Precursors for Medical Materials in the Presence of β-Pyrochlore Oxides.- 6. Antimicrobial Effect of Nano- and Sub-micron Particles of Metal Oxides with β-Pyrochlore Structure.- 7. Methods for Preparation of Pyrochlore Oxides and Their Effect on Photocatalytic Activity.- REFERENCES.

Dr. Diana G. Fukina was born in 1993, obtained M.Sc. degree in 2016 and Ph.D. in 2020. She currently serves as Head of the Laboratory of Inorganic Materials at Lobachevsky State University of Nizhny Novgorod. The field of her research interest is synthesis and characterization of new inorganic compounds based on pyrochlore structure type. The several last years the investigations have been devoted to study of photocatalytic ability of the prepared materials, including improving the effectiveness for wastewater purification. Moreover, she delivers lectures and conducts seminars and laboratory classes in the fields of "Research Methods of Solid State materials", "Structure of Matter" and "Radiochemistry and Radioecology" at the Department of Solid State Chemistry in Lobachevsky University.Dr. Artem S. Belousov was born in 1988 and obtained his M.Sc. degree in 2011 and Ph.D. in 2016. He currently serves as Senior Researcher of the Laboratory of High-Purity Materials at Lobachevsky State University of Nizhny Novgorod. His research focuses on designing heterogeneous photocatalysts based on complex oxides with pyrochlore and perovskite structures for degrading organic pollutants and desulfurizing fuels. Dr. Belousov has authored more than 25 articles in reputable journals such as GreenChemistry, Sustainable Energy & Fuels, Materials Today Chemistry, Journal of Environmental Chemistry Engineering, and Environmental Research. Furthermore, he works as Associate Professor at the Department of Solid State Chemistry in Lobachevsky University, where he delivers lectures and conducts seminars and laboratory classes in the fields of "Chemical Engineering," "Processes and Devices for Chemical Production," and "Materials Science and Engineering".Prof. Dr. Evgeny V. Suleimanov was born in 1968, obtained Ph.D. in 1994 and Doctor of Sciences in 2003. He currently serves as the Head of the Research Institute for Chemistry at Lobachevsky State University of Nizhny Novgorod. The field of his research interest is synthesis and characterization of inorganic compounds based on pyrochlore structure type, including thermodynamic investigation. Moreover, he supervises the study of pyrochlore oxides for different photocatalytic processes, including decomposition of organic pollutants, antifungal and antibacterial effect, and radical polymerization. He is the Head of the Department of Solid State Chemistry in Lobachevsky University and delivers lectures in the fields of "Material Sciences", "Research Methods of Solid State materials" and "Structure of Matter".

• Preface.- 1. Structural Type of α-Pyrochlore Oxides.- 2. Structural Type of β-Pyrochlore Oxides AM2O6.- 3. Theoretical Foundations of Photocatalysis.- 4. Application of Compounds with Pyrochlore Structure in Photocatalysis.- 5. Synthesis of Composites Based on Natural and Synthetic Polymers as Precursors for Medical Materials in the Presence of β-Pyrochlore Oxides.- 6. Antimicrobial Effect of Nano- and Sub-micron Particles of Metal Oxides with β-Pyrochlore Structure.- 7. Methods for Preparation of Pyrochlore Oxides and Their Effect on Photocatalytic Activity.- REFERENCES.

Dr. Diana G. Fukina was born in 1993, obtained M.Sc. degree in 2016 and Ph.D. in 2020. She currently serves as Head of the Laboratory of Inorganic Materials at Lobachevsky State University of Nizhny Novgorod. The field of her research interest is synthesis and characterization of new inorganic compounds based on pyrochlore structure type. The several last years the investigations have been devoted to study of photocatalytic ability of the prepared materials, including improving the effectiveness for wastewater purification. Moreover, she delivers lectures and conducts seminars and laboratory classes in the fields of "Research Methods of Solid State materials", "Structure of Matter" and "Radiochemistry and Radioecology" at the Department of Solid State Chemistry in Lobachevsky University.Dr. Artem S. Belousov was born in 1988 and obtained his M.Sc. degree in 2011 and Ph.D. in 2016. He currently serves as Senior Researcher of the Laboratory of High-Purity Materials at Lobachevsky State University of Nizhny Novgorod. His research focuses on designing heterogeneous photocatalysts based on complex oxides with pyrochlore and perovskite structures for degrading organic pollutants and desulfurizing fuels. Dr. Belousov has authored more than 25 articles in reputable journals such as GreenChemistry, Sustainable Energy & Fuels, Materials Today Chemistry, Journal of Environmental Chemistry Engineering, and Environmental Research. Furthermore, he works as Associate Professor at the Department of Solid State Chemistry in Lobachevsky University, where he delivers lectures and conducts seminars and laboratory classes in the fields of "Chemical Engineering," "Processes and Devices for Chemical Production," and "Materials Science and Engineering".Prof. Dr. Evgeny V. Suleimanov was born in 1968, obtained Ph.D. in 1994 and Doctor of Sciences in 2003. He currently serves as the Head of the Research Institute for Chemistry at Lobachevsky State University of Nizhny Novgorod. The field of his research interest is synthesis and characterization of inorganic compounds based on pyrochlore structure type, including thermodynamic investigation. Moreover, he supervises the study of pyrochlore oxides for different photocatalytic processes, including decomposition of organic pollutants, antifungal and antibacterial effect, and radical polymerization. He is the Head of the Department of Solid State Chemistry in Lobachevsky University and delivers lectures in the fields of "Material Sciences", "Research Methods of Solid State materials" and "Structure of Matter".

• Preface.- 1. Structural Type of α-Pyrochlore Oxides.- 2. Structural Type of β-Pyrochlore Oxides AM2O6.- 3. Theoretical Foundations of Photocatalysis.- 4. Application of Compounds with Pyrochlore Structure in Photocatalysis.- 5. Synthesis of Composites Based on Natural and Synthetic Polymers as Precursors for Medical Materials in the Presence of β-Pyrochlore Oxides.- 6. Antimicrobial Effect of Nano- and Sub-micron Particles of Metal Oxides with β-Pyrochlore Structure.- 7. Methods for Preparation of Pyrochlore Oxides and Their Effect on Photocatalytic Activity.- REFERENCES.