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Structural and electrical properties as well as peculiarities of degradation processes in the Cu- and Ni-enriched thick-film elements based on oxymanganospinel ceramics are investigated. The thermal “shock” effect in the initial stage of isothermal exposure at 170 oC with future stabilization of electrical resistance on this level up to final degradation test was revealed. It is shown that high temperature-sensitivity...
Modelling of degradation process in functional high-reliable temperature-sensitive Cu0.1Ni0.8Co0.2Mn1.9O4 ceramics is performed. It is shown that additives of NiO phases formed during sintering and localized near grain boundaries of ceramics suppress ageing process in these materials. This effect is character for monolithized fine-grain ceramics obtained due to thermal energy transformed during sintering...
The failure to remove tetracycline (TC) in most conventional wastewater treatment systems results in the discharge and accumulation of TC in the environment, which in turn, increases the potential for developing TC-resistance in naturally occurring microorganisms. Thus, there is a need to explore other processes that can enhance TC degradation during wastewater treatment. In this study, we investigated...
Within the photovoltaic standards community there is a desire to create a standardized set of tests suitable for predicting service life. Ideally, one would want to link a set of exposure conditions to an equivalent number of years in the desired use location, or to predict the performance as a function of time. However, the inherent uncertainties in the acceleration factors lead to large uncertainties...
To study the aging principle of sealing performance of nitrile butadiene rubber (NBR), a mathematical model is proposed based on the correlation between mechanical performance and microscopic flaws. We assume that oxidative cross-linking and molecular chain scission are two main microscopic flaws of NBR, which could result in performance degradation. In this paper, we use Kinetics model to relate...
Nano-TiO2 photo catalyst powders were prepared through the sol-gel method and with supercritical fluid drying(SCFD). The SEM, XRD and particle size distribution technique were used to characterize the hyperfine TiO2 particles. The reaction of photo-catalysis for methylene blue is in conformity with the first order kinetic law in appearance within the concentration range between 5mg/L and 15 mg/L....
Electrocatalytic oxidation of indomethacin on a modified multiplewalled carbon nanotubes (MWCNTs) cathode in aqueous solution was studied in this paper. The experiments were carried out to explore the effects of initial concentration, electrolytic voltage, pH, concentration of electrolyte and electrolysis time on removal rate of indomethacin. The results of show that the removal rate reached 78% by...
The degradation of chlorinated phenoxy acetic acids herbicides 2,4-D (2,4-dichlorophenoxyacetic acid) in aqueous solution using ultrasound-enhanced ozonation was studied in this paper. The effect of different parameters such as pH value and 2,4-D initial concentration in reaction solution on the kinetics of degradation of 2,4-D was investigated in an experimental reactor. It is found that the degradation...
The novel photocatalyst, La2O3-NiO, was prepared by sol-gel with nickel nitrate hexahydrate and lanthanum salt, characterized by means of XRD and SEM. Its photocatalytic activities were evaluated by degradation of Direct Bordeaux (DB) solution as a simulated dye wastewater under daylight irradiation. The results show that Pure and La-doped NiO are a cubic perovskite structure with space group Fm-3m...
Pentachlorophenol (PCP), a notoriously recalcitrant and toxic organic contaminant, was investigated for its degradation with nanoscale Fe and Ni/Fe particles. Compared with the bare nano Fe, the bimetallic Ni/Fe nanoparticles exhibited much higher reactivity. The rate of PCP transformation can be described by pseudo first-order kinetics, and the apparent rate constants were calculated to be 0.04 and...
In order to investigate the effects of drying temperature on the vitamin C in Chinese jujube and provide reference for the drying process, the degradation kinetics of ascorbic Acid (AA) and dehydroascorbic Acid (DHAA) at 50, 60 and 70°C has been investigated. The results showed that the loss of AA at different drying temperatures followed the Weibull model and all the correlation coefficients (R2)...
In this study, the direct red dye is degraded by a new discharge non-thermal plasma reactor. And the kinetic equation has been set up and analyzed. The result shows that the mass concentration of the direct red dye in solution decreases exponentially with the lengthening reaction time under the experimental conditions of the different initial concentrations, pH and the supplying voltages. The kinetic...
Adsorption equilibrium and kinetics of typical acidic and basic dyes, acid red 33 and basic violet 3, onto Semen Euryales Shell Activated Carbon (SESAC) were investigated under varying solution pHs and temperatures. Equilibrium data showed acidic pH was favourable for the adsorption of acid red 33 onto SESAC, while basic pH was favourable for basic violet 3. The adsorption capacity of dye increased...
This paper reports the kinetics of thermal degradation of Dendrobium Sonia ‘Red Bom’ anthocyanins extract (DSAE) containing the red flavylium cations of anthocyanins. The stability of DSAE was studied at different temperatures for different periods of storage by measuring the absorbance at the wavelength of maximum absorption in the visible light region. The thermal degradation profiles at all temperatures...
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