DETERMINATION OF HYDROGEN PEROXIDE IN RIVER WATER BASED ON CATALYTIC EFFECT OF TIO 2 NANO PARTICLE ON PEROXY OXALATE CHEMILUMINESCENC OF TRIAZIN DYE DERIVATIVE (original) (raw)
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Environmental problems related to the generation of wastewater contaminated with organic compounds and the emissions of pollutants from fuel burning have become major global problems. Thus, there is a need for the development of alternative and economically viable technologies for the remediation of the affected ecosystems. Therefore, this work describes the preparation and characterization of a Ti(OH)4 catalyst with the modified surface for application in the photodegradation of organic compounds (methylene blue (MB) dye and the drug amiloride (AML)) and in the artificial photosynthesis process. Characterization results reveal that peroxo groups on the surface of the catalyst had a great influence on the optical properties of the Ti(OH)4 and consequently in its photocatalytic property. This catalyst showed a high photocatalytic activity for the degradation of organic pollutants under visible radiation, reaching approximately 98% removal of both the dye and the drug in 150 min of re...
Journal of colloid and interface science, 2017
Nanoparticles proved a viable alternative to the already used sensing and diagnostics methods due to their low cost, good stability, easy availability and easy synthesis. In the present approach, nitrogen doped titania nanoparticles are prepared through freeze drying method, and subsequently stabilized through ionic liquid. These nanoparticles were characterized through various techniques such as X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), BET pore size and surface area analyzer, X-ray photoelectron spectroscopy (XPS) and UV-Visible diffuse reflectance spectroscopy (UV-Vis. DRS). The synthesized nitrogen doped titania nanoparticles were proved to be a novel peroxidase mimetic with great potential to catalyze oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H2O2) to form a blue color product. As a proof of concept, this new enzyme mimic was used as a robust nanoprobe f...
Journal of Physical Chemistry B, 2006
Thermal generation of oxygen and hydroxylated aromatic compounds by hydrogen peroxide, catalyzed by flocculation of titanium dioxide nanocrystallites aqueous suspension upon addition of hydrogen peroxide, is reported. The oxidation involves catalytic cleavage of a peroxide molecule followed by hydroxyl reaction with the organic solutes. The catalytic hydroxylation is associated with formation of TiO 2-H 2 O 2 aggregates, which occurs within a specific range of [TiO 2 ]/[H 2 O 2 ] ratio. Comparison of the activation energy to literature values in the absence of nanoparticles indicates that flocculation induces an increase of the rate without decreasing the activation energy. This is, to the best of our knowledge, a unique case of nanoparticles catalysis driven by formation of a three-dimensional structure of the suspended particles.
TiO2 nanoparticles prepared using an aqueous peroxotitanate solution
Ceramics International, 2004
A novel preparation method for nanocrystalline titanium dioxide (TiO 2) was introduced in this paper. We prepared a new aqueous peroxotitanate solution using H 2 TiO 3 , ammonia and H 2 O 2 as starting materials. Amorphous precursor powder with different morphology was formed at near room temperature, which was transformed to anatase after annealing at 300 • C followed by rutile at 850 • C. This method is simple, environmental friendly and promising to be used for TiO 2 synthesis.
Micro & Nano Letters, 2011
A nanocrystalline TiO 2 was successfully synthesized using simple aqueous peroxo route and subsequently the surface characterization of TiO 2 was carried out using X-ray diffraction and Scanning electron microscopy. The synthesized nanocrystalline TiO 2 successfully decomposed the aqueous remazol brown dye solution under UV light irradiation with and without ozone. The effects of pH, TiO 2 dose and irradiation time for decomposition of dye solution were also evaluated. The maximum dye decomposition efficiency of 96.6 % was achieved with the minimal time of 45 min by UV/TiO 2 /O 3 treatment. The present study clearly indicates that the peroxo route TiO 2 nanoparticle is a promising material for industrial waste water treatment.
CrystEngComm, 2013
TiO 2 nanoparticles were prepared from titanium tetrachloride (TiCl 4) in CH 2 Cl 2 at 80°C for 30 h, 42 h and 70 h using urea hydrogen peroxide (UHP) as an oxygen donor with a TiCl 4 : UHP molar ratio of 1 : 2. The XRD patterns and Raman spectroscopy results showed that the products consisted of anatase TiO 2. IR and solid-state 13 C NMR with cross polarization and magic angle spinning techniques revealed the presence of urea. TEM observation revealed that the products prepared by the reactions for 30 and 42 h consisted of water-dispersible spheroid nanoparticles with a long axis of~5 nm, while an aggregation of nanoparticles was evident upon reaction for 70 h. Thermogravimetry, inductively-coupled plasma emission spectrometry and CHN analysis showed that the amount of urea increases in the following order: TiO 2 _42h, TiO 2 _70h, TiO 2 _30h. The photocatalytic activity of the products dispersible in water (TiO 2 _30h and TiO 2 _42h) was estimated based on the degradation behaviour of methylene blue, and TiO 2 _42h showed higher photocatalytic activity than TiO 2 _30h. It is proposed that TiCl 4 was directly oxidized by UHP to form anatase TiO 2 in the early stage of the process.
The photocatalytic behaviour of TiO 2 has been thoroughly investigated the past years using UV light to photoactivate TiO 2 . As this method introduces complications making it difficult to do it economically viable, new pathways to activate TiO 2 have been sought. In the present work, reactive oxygen species (ROS) were obtained in a suspension of hydrogen peroxide (H 2 O 2 ) and titanium dioxide (TiO 2 ) in darkness, offering an alternative method to initiate oxidative behaviour of TiO 2 . Methylene blue (MB) degradation was chosen as an indicator for measuring the catalytic effect, allowing for a comparison of the reaction kinetics with other methods to create ROS with TiO 2 . The effects of TiO 2 particle effective surface area and concentration of H 2 O 2 were also studied. EPR studies were made to determine the presence of free radicals in the mixture of TiO 2 /H 2 O 2 in darkness. Under the given lighting conditions, the results demonstrate the relevance of the TiO 2 effective surface area and concentration of H 2 O 2 and TiO 2 as parameters influencing the chemical catalysis of MB due to the action of hydroxyl (OH • ) and/or hydroperoxide radicals (HO 2 • ).
Applied catalysis. B, Environmental, 2011
Morphologically different TiO 2 nanocrystals were prepared by oxidant-peroxo method (OPM) synthesis. Morphological characterization was performed with the use of field emission gun-scanning electron microscope, X-ray diffraction and low temperature N 2 adsorption. The photocatalytic behavior of synthesized TiO 2 powders was studied in the reaction of Rhodamine B photodegradation in water. The trials showed that synthesis performed at pH value around 8 generated materials with higher photoactivities than at other pH values. Zeta potential, Fourier transform infrared spectroscopy, X-ray absorption near edge structure part of the absorption spectra, photoluminescence spectroscopy and high resolutiontransmission electron microscopy measurements were performed to investigate why the materials had different photoactivities. Two dominant particle characteristics, which came from synthesis environment, interfered in the photoactivity of materials. These characteristics were surface hydroxylation, which had a positive effect on photocatalysis, and crystalline defects due to crystal growth, which had a deleterious effect on photocatalysis. Both characteristics increased with an increase in synthesis pH value. Dye degradation mechanism in water, an oxidation by hydroxyl radicals, was used to explain the different photoactivities and the optimum synthesis pH.