قائمة الطعام
Titanium dioxide, on the other hand, has remained the most in-depth researched photocatalytic material due to its availability, selectivity, low ... This study established a kinetic model for TiO 2-based photocatalytic activity and theoretically determined the optimal relationship between photocatalyst concentration and reaction ...
In this work, phosphate-modified titanium dioxide nanoparticles with mesoporous structure were synthesized and utilised as an efficient nanoadsorbent for Sr(II) removal from aqueous environment. The globular titania particles with a 3–4 nm diameter with chemosorbed on their surfaces phosphate groups = Ti(O 2 POOH) have been …
Titanium dioxide nanoparticles (nTiO 2) were rapidly adsorbed on microplastics (MPs). • The experimental data fit well with the pseudo-second order kinetic model. • Both suspended nTiO 2 and nTiO 2 immobilized on MPs were photocatalytic. • Adsorption of nTiO 2 on MPs reduced the UV-induced toxicity of nTiO 2.
In this study, the kinetics of the dehydration behavior and reaction mechanism of titanium dioxide were investigated under different atmospheres by …
Dermal penetration potentials of titanium dioxide nanoparticles (TiO 2 NPs) may be affected by aggregation upon contact with sweat. This study investigated the aggregation kinetics of three TiO 2 NPs in thirty human sweat samples and four artificial sweat standards. Effects of particle concentration, sweat type, and inorganic (sodium chloride, …
Titanium dioxide (TiO 2) is widely used as a pigment, additive in food, and personal care.The properties and applications of titanium dioxide vary with crystal structure. In this study, in situ high-temperature X-ray diffraction was used to examine the effect of silicon doping on the phase-transition kinetics of titanium dioxide. …
The photo-catalytic property of TiO2-NPs seemingly accomplished improvement of leaves and growth kinetics traits by fertigation the soil of wheat cultivars growing at different water regimes. TiO2-NPs fertigation promoted leaf characteristics through production of thicker and heavier leaves as well as promoting leaf longevity by …
Photocatalytic water treatment using nanocrystalline titanium dioxide (NTO) is a well-known advanced oxidation process (AOP) for environmental remediation. With the in situ generation of electron-hole pairs upon irradiation with light, NTO can mineralize a wide range of organic compounds into harmless end products such as carbon dioxide, water, …
Kinetics, Minerals, Oxides, Redox reactions, Transfer reactions. Abstract. As metal oxide reduction may be a limiting or otherwise important step in a reaction …
The adsorption of yttrium cations from an aqueous solution of YCl3 by sodium-modified titanium dioxide (Na-TiO2) was investigated. The Na-TiO2 was obtained by impregnating Na+ cations into the ...
The temperature influenced the overall kinetics, while an increase in TiCl 4 concentration had the opposite effect on the kinetics (Charbonneau, Gauvin, & Demopoulos, 2009). ... The preparation method of titanium dioxide particles in this study is divided into two steps: the preparation of the stock solution and the thermal hydrolysis of …
The catalytic effect of titanium dioxide nanoparticles (n-TiO 2) on the thermal properties and the decomposition kinetics of the double-base nitrocellulose …
studied. The adsorption kinetics in view of four kinetic models, i.e., the pseudo-rst-order Lagergren, pseudo-second-order, intra-particle diusion and Elovich models, was discussed. The adsorption of MG is well described by the pseudo-second-order equation with the best determination coecient (R 2 = 0.999). The experimental isotherm data were ...
The titanium dioxide (TiO 2) nanoparticles (PA grade) get from Sigma Aldrich, with particle size <25 nm. ... The kinetic parameters were analyzed at heating rates of 20 and 25 °C min −1 in the main decomposition stage (Stage) II (186.43–589.75 °C), using various reaction models.
The aggregation of commercial titanium dioxide NP powder (25 nm) was investigated with various environmentally relevant solution chemistries containing …
Initial measurements of the morphology and rate of formation of nano-TiO2 aggregates in aqueous suspensions as a function of ionic strength and of the nature of the electrolyte in a moderately acid to circumneutral pH range typical of soil and surface water conditions indicate that divalent cations may enhance aggregation of nano, TiO2 in soils …
Titanium dioxide (TiO 2) is widely used as a pigment, additive in food, and personal care.The properties and applications of titanium dioxide vary with crystal structure. In this study, in situ high-temperature X-ray diffraction was used to examine the effect of silicon doping on the phase-transition kinetics of titanium dioxide.
Kinetics of anatase transition to rutile TiO 2 from titanium dioxide precursor powders synthesized by a sol-gel process have been studied using differential thermal analysis (DTA), X-ray diffraction, transmission electron microscopy (TEM), selected area electron diffraction (SAED), nano beam electron diffraction (NBED) and high …
Abstract. Controlling titanium dioxide crystallinity is crucial in view of the possible oxide applications. In this study, we examined the effects of calcium doping on the anatase-rutile phase transition via in-situ high-temperature X-ray diffraction. The phase transition temperature of calcium-doped TiO 2 was approximately 900 °C ...
The formation of bridging hydroxyls (OHb) via reactions of water molecules with oxygen vacancies (VO) on reduced TiO2(110) surfaces is studied using polarized infrared reflection–absorption spectroscopy (IRAS), electron-stimulated desorption (ESD), and photon-stimulated desorption (PSD). Narrow IR peaks at 2737 and 3711 cm−1 are …
The environmental risk assessments of titanium dioxide nanoparticles (TiO2 NPs) have drawn wide attention and one of the required critical information is the bioconcentration potentials of these nanoparticles in aquatic organisms. ... (ke) of TiO2 NPs and then employed a first-order kinetic model to predict the bioconcentration factors …
The influence of solid carbon on the chlorination of TiO2 with Cl2 and CO-CO2-Cl2 gas mixtures was investigated gravimetrically using rutile and graphite tablets. In the experiments, the temperature, composition and total pressure of the gas phase as well as the TiO2-C separation were varied. The chlorination rate of TiO2 was found to be 40 to …
@misc{etde_22077427, title = {The effect of electrolytes on the aggregation kinetics of titanium dioxide nanoparticle aggregates} author = {Shih Yanghsin, E-mail: [email protected], Chengming, Zhuang, Chihping, Tso, and Chenghan, Lin} abstractNote = {Metal oxide nanoparticles (NPs) are receiving increasing attention due to their increased …
For n = 2, i.e. for second order kinetics the integrated form of Eq. (3) can be given as (6) 1 C = 1 C o + k t (7) O r, C = C o 1 + k C o t. The second order kinetics has been used for the low initial concentration of pollutants [117]. 100 µg/L sulfamonomethoxine exhibits second order kinetics during the treatment with high-silica zeolite/TiO ...
The degradation kinetics and mechanism of MAT by TiO 2 under low-wattage UV illumination (9 W with maximum output at 365 nm) were investigated. Experimental parameters were varied including the TiO 2 loading, MAT concentration, and pH. During treatment, MAT and its intermediates were tracked by HPLC-MS/MS, along …
Titanium dioxide (TiO 2) is widely used as a pigment, additive in food, and personal care. The properties and applications of titanium dioxide vary with crystal …
The reliability of the mathematical model has been tested on kinetic runs performed under different conditions of temperature, titanium concentration, and sulfuric acid concentration. 1986 Academic Press, Inc. INTRODUCTION The hydrolysis of titanium (IV) sulfate so- lutions is the most important step in the man- ufacture of TiO2 by the …
The extensive use of titanium dioxide nanoparticles (nano-TiO 2) in many consumer products has raised concerns about possible risks to the environment.The magnitude of the threat may depend on whether nano-TiO 2 remains dispersed in the environment, or forms much larger-sized aggregates or clusters. Currently, limited information is available on …
This paper focuses on the kinetics of photocatalytic removal and carbon mineralization of gaseous trichloroethylene (TCE) on near-UV irradiated TiO 2 Degussa P25. Experiments were carried out in a flat-plate photoreactor at TCE inlet concentrations of 100–500 ppmv, relative humidities (RH) of 0–62% and gas residence times of 2.5–60.3 s. …
Titanium dioxide (TiO 2) is non-toxic and has good corrosion resistance, high chemical and thermal stability. TiO 2 has a wide range of applications including as photocatalysts, in solar cells, self-cleaning surfaces, wastewater treatment and as an …
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