Synthesis and characterization of SiO2/Bi2WO6 based on biogenic silica synthesized by sol-gel method

SiO2/Bi2WO6 photocatalyst with Si/Bi/W=1:2:1 molar ratio was obtained by the sol-gel method from bismuth nitrate, sodium tungstate and biogenic silica from rice husk biomass followed by calcination. Bi2WO6 was used as a control sample. FT-IR, SEM, XRD, EDXRF, UV-Vis methods were used to systematically characterize the as-obtained materials. Photodegradation of Indigo Carmine in exposure to UV, sunlight and xenon light was studied to evaluate their photocatalytic activities in the presence of SiO2/Bi2WO6 and Bi2WO6. It was shown that the degradation degree of Indigo Carmine in the presence of SiO2/Bi2WO6 under the action of UV irradiation and sunlight reaches 36% and 14%, respectively. The SiO2/Bi2WO6 sample is stable during photocatalytic studies

Synthesis and characterization of SiO

SiO2/Bi2WO6 photocatalyst with Si/Bi/W=1:2:1 molar ratio was obtained by the sol-gel method from bismuth nitrate, sodium tungstate and biogenic silica from rice husk biomass followed by calcination. Bi2WO6 was used as a control sample. FT-IR, SEM, XRD, EDXRF, UV-Vis methods were used to systematically characterize the as-obtained materials. Photodegradation of Indigo Carmine in exposure to UV, sunlight and xenon light was studied to evaluate their photocatalytic activities in the presence of SiO2/Bi2WO6 and Bi2WO6. It was shown that the degradation degree of Indigo Carmine in the presence of SiO2/Bi2WO6 under the action of UV irradiation and sunlight reaches 36% and 14%, respectively. The SiO2/Bi2WO6 sample is stable during photocatalytic studies

Synthesis and characterization of SiO

SiO2/Bi2WO6 photocatalyst with Si/Bi/W=1:2:1 molar ratio was obtained by the sol-gel method from bismuth nitrate, sodium tungstate and biogenic silica from rice husk biomass followed by calcination. Bi2WO6 was used as a control sample. FT-IR, SEM, XRD, EDXRF, UV-Vis methods were used to systematically characterize the as-obtained materials. Photodegradation of Indigo Carmine in exposure to UV, sunlight and xenon light was studied to evaluate their photocatalytic activities in the presence of SiO2/Bi2WO6 and Bi2WO6. It was shown that the degradation degree of Indigo Carmine in the presence of SiO2/Bi2WO6 under the action of UV irradiation and sunlight reaches 36% and 14%, respectively. The SiO2/Bi2WO6 sample is stable during photocatalytic studies

Electrochemical Properties of Bismuth Oxide Films on Titanium Formed by Plasma Electrolytic Oxidation

На поверхности титана методом плазменно-электролитического оксидирования (ПЭО) сформированы висмутосодержашие оксидные покрытия из электролитов, содержащих комплексные ионы ЭДТА-Bi3+. Определены электрохимические характеристики – токи обмена, коэффициенты переноса α и β, коэффициенты a и b в уравнении Тафеля. Для полученных систем установлено возникновение аналитического сигнала при комплексонометрическом титровании солей железа (III). Рядом физических методов (сканирующая электронная микроскопия с энергодисперсным анализом и рентгеновская фотоэлектронная спектроскопия) изучены морфология и состав поверхности оксидных покрытий. Найдена корреляция между морфологией, составом поверхности и электрохимическими свойствами образцовBismuth oxide layers on a titanium are formed by a plasma electrolytic oxidation (PEO) method from electrolytes containing complex ions EDTA-Bi3+. Electrochemical characteristics – exchange currents, transport coefficients α and β, a and b coefficients in Tafel’s equation are defined. For the obtained systems occurrence of an analytical signal at complexometric titration of salts of Fe (III) is established. The structural features of surface electrodes have been investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) techniques. Correlation between morphology, structure of a surface and electrochemical properties of samples is foun

Electrochemical Properties of Bismuth Oxide Films on Titanium Formed by Plasma Electrolytic Oxidation

На поверхности титана методом плазменно-электролитического оксидирования (ПЭО) сформированы висмутосодержашие оксидные покрытия из электролитов, содержащих комплексные ионы ЭДТА-Bi3+. Определены электрохимические характеристики – токи обмена, коэффициенты переноса α и β, коэффициенты a и b в уравнении Тафеля. Для полученных систем установлено возникновение аналитического сигнала при комплексонометрическом титровании солей железа (III). Рядом физических методов (сканирующая электронная микроскопия с энергодисперсным анализом и рентгеновская фотоэлектронная спектроскопия) изучены морфология и состав поверхности оксидных покрытий. Найдена корреляция между морфологией, составом поверхности и электрохимическими свойствами образцовBismuth oxide layers on a titanium are formed by a plasma electrolytic oxidation (PEO) method from electrolytes containing complex ions EDTA-Bi3+. Electrochemical characteristics – exchange currents, transport coefficients α and β, a and b coefficients in Tafel’s equation are defined. For the obtained systems occurrence of an analytical signal at complexometric titration of salts of Fe (III) is established. The structural features of surface electrodes have been investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) techniques. Correlation between morphology, structure of a surface and electrochemical properties of samples is foun