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

Individual Differences in Students’ Effort Source Beliefs Predict Their Judgments of Ability

A recent set of studies (Muenks, Miele, & Wigfield, 2016) introduced the concept of perceived effort source to better explain how students reason about the relation between effort and ability when evaluating the academic abilities of other students. These studies showed that participants who were induced to perceive effort as task-elicited (i.e., as being primarily due to the subjective difficulty of the task) were more likely to view effort and ability as inversely related than participants who were induced to perceive effort as self-initiated (i.e., as being due to students’ motivation to go beyond the basic demands of the task). The current studies expanded on this research by demonstrating that, in the absence of an effort source manipulation, college students spontaneously invoked beliefs about the source of effort when evaluating their own (Study 2) and other students’ (Studies 1–3) abilities. The three studies also showed that our novel measure of individual differences in effort source beliefs was a better predictor of participants’ judgments of math ability (Studies 1 and 2) and verbal ability (Study 3) than a standard measure of their ability mindsets (i.e., beliefs about the extent to which intelligence is malleable). Specifically, participants who naturally tended to perceive effort as task-elicited generally rated students who expended relatively little effort as having more ability than did participants who tended to perceive effort as self-initiated. Implications for research on student motivation and for education practice are discussed

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