Фізико-хімічні та фотокалітичні дослідження композиції ZnO-SnO2 еквімолярного складу, модифікованої шляхом гідротермальної та термічної обробки

• Date: 2017
• Main Authors: Sydorchuk, V. V., Khalameida, S. V., Davydenko, L. O., Zakutevsky, O. I.
• Format: Article
• Language: Ukrainian
• Published: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2017
• Subjects: мета- та ортостаннати цинку; кристалічна та мікромезопорувата структура; родамін Б; фотокаталітична активність
• Online Access: https://www.cpts.com.ua/index.php/cpts/article/view/420
• Journal Title: Chemistry, Physics and Technology of Surface

We studied the interaction in mixture of low-dispersed crystalline zinc and tin oxides as well as in their coprecipitated X-ray amorphous composition under hydrothermal and thermal treatment. The aims of work were the study of phase composition and porous structure of obtained products as well as evaluation of their photocatalytic activity under visible light. We used XRD and DTA-TG analysis, FTIR and UV-Vis spectroscopy, adsorption-desorption of nitrogen and photocatalytic degradation for characterization of prepared oxide compositions. Hydrothermal treatment at 200–300 °C does not lead to formation of new crystal phases. On the other hand, zinc stannates are formed under the same conditions from coprecipitated oxides. Stannates possess high specific surface area (166–227 m2/g) and developed and regulated micro-mesoporous structure (total pore volume – 0.13–0.27 cm3/g). The investigation of Rhodamin B photocatalytic degradation in visible region shows that oxides mixture possesses the higher activity than zinc stannates, although the latter have the higher value of specific surface area. However, accessibility of internal surface of porous stannates for dye molecules is obviously insufficient. The rate constant of photocatalytic degradation of Rhodamine B is 4.6–11.2·10-5 s-1 when modified low-dispersed compositions are used as catalysts. The degree of dye mineralization achieves 57 %.