Photolysis
Mostrando 1-12 de 380 artigos, teses e dissertações.
-
1. Thermal, structural and optical properties of magnetic BiFeO3 micron-particles synthesized by coprecipitation method: heterogeneous photocatalysis study under white LED irradiation
Abstract Bismuth ferrite, BiFeO3 (BFO) prepared via a coprecipitation method, was used as an effective photocatalyst for the degradation of methylene blue (MB) using a white light-emitting diode (LED-50 W) lamp. The as-prepared material was characterized by TGA, XRD, SEM-EDX, FTIR, and UV-vis-DRS techniques. The effects of experimental key parameters such as
Cerâmica. Publicado em: 2022
-
2. A Comparison of the Photolytic and Photocatalytic Degradation of Triclosan: Identification of Transformation Products and Ecotoxicity Evaluation
Triclosan (5-chloro-2-(2,4-dichlorophenoxy)phenol) is commonly used as an antibacterial agent in various industrial products and is often detected in wastewater effluent. Comparison was made for triclosan degradation by photolysis and TiO2 photocatalysis (under UV irradiation (125 W)) based on analysis of transformation products, together with ecotoxicity ev
J. Braz. Chem. Soc.. Publicado em: 2021-08
-
3. LABORATORY INVESTIGATION OF X-RAY PHOTOLYSIS OF METHANOL ICE AND ITS IMPLICATION ON ASTROPHYSICAL ENVIRONMENTS
Methanol (CH3OH) is one of the most abundant organic molecules in astrophysical environments. It has been found in cold regions such as surfaces of comets, ices near young stellar objects and protoplanetary disks, as well as in the gas phase in different regions in space. In this work, we experimentally simulate the methanol ice and its behavior when irradia
Quím. Nova. Publicado em: 2020-05
-
4. Photocatalytic degradation of ferricyanide as synthetic gold mining wastewater using TiO2 assisted by H2O2
Abstract Ferricyanide Fe(CN) 6 3- is one of the most stable cyanometallic complexes present in the gold mining effluents. This cyanocomplex is hard to degrade by natural attenuation and generates a negative impact on aquatic environments. Although free cyanide (CN-) can be obtained by acidifying the solution, the CN- is lethal for all forms of life. The oxid
REM, Int. Eng. J.. Publicado em: 2020-03
-
5. Nanostructured Systems Obtention Using LbL Self-Assembly or the Cysteine-Assisted Adsorption Method and Their Application as a Water Splitting Single Catalyst
The present work evaluated the effect on charge transfer in functionalized TiO2 nanostructured systems using different binders. We highlight the conditions required to form self-assembled systems by varying the number of layers, as well as by substituting them for an organic binder, cysteine. Additionally, we study the pH effect of the precursor solution (HA
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
-
6. Development and validation of a stability-indicating LC-UV and LC-MS/MS methods for quantitative analysis of anisomycin and identification of degradation products
ABSTRACT Multifunctional drug anisomycin was subjected to forced degradation in accordance with International Conference on Harmonisation (ICH) guidelines for the first time. The drug was exposed to the recommended stress conditions of hydrolysis (acidic, alkaline and neutral), oxidation, thermal stress and photolysis, in order to investigate its stability.
Braz. J. Pharm. Sci.. Publicado em: 26/07/2018
-
7. Colorimetric Analysis of Cotton Textile Bleaching through H2O2 Activated by UV Light
The bleaching process is one of the steps of cotton fabric manufacture. Traditionally, the most common bleaching procedure is based on the use of a hydrogen peroxide (H2O2) solution in alkali pH associated with high temperature. In this study, we investigated the possibility of applying a photolysis technique, combining ultraviolet (UV) light and H2O2 in aci
J. Braz. Chem. Soc.. Publicado em: 2018-06
-
8. Suspended and Immobilized TiO2 Photocatalytic Degradation of Estrogens: Potential for Application in Wastewater Treatment Processes
This work evaluated the photocatalytic activity of suspended TiO2, and TiO2-coated glass Raschig rings with respect to degradation of estrogens estrone (E1), 17β-estradiol (E2), and 17α-ethinylestradiol (EE2) in aqueous solutions and wastewater effluent samples. Gas chromatography/tandem mass spectrometry (GC-MS/MS) studies were carried out to identify deg
J. Braz. Chem. Soc.. Publicado em: 2018-02
-
9. Development and Validation of a Stability-Indicating Method for Perillyl Alcohol Incorporated in Poly(lactide-co-glycolide) Nanoparticles and Stress Degradation Studies
Perillyl alcohol has been studied in the treatment of cancer disease. However, its high toxicity is a drawback, which can be overcome by its incorporation in nanostructured systems. The aim of this work was to develop and validate a chromatographic method for determination of perillyl alcohol encapsulation efficiency in a polymeric nanoparticles formulation
J. Braz. Chem. Soc.. Publicado em: 2017-12
-
10. Rate Coefficient for the Reaction of Cl Atoms with cis-3-Hexene at 296 ± 2 K
The rate coefficient of the cis-3-hexene + Cl atoms reaction at 296 ± 2 K and 750 ± 10 Torr was determined using the relative rate technique. The reaction was investigated using an 80 L Teflon reaction bag and a gas chromatograph coupled with flame-ionization detection. Chlorine atoms were produced by the photolysis of trichloroacetyl chloride. No previous
J. Braz. Chem. Soc.. Publicado em: 2017-11
-
11. ESTRATÉGIAS E MATERIAIS UTILIZADOS EM FOTOCATÁLISE HETEROGÊNEA PARA GERAÇÃO DE HIDROGÊNIO ATRAVÉS DA FOTÓLISE DA ÁGUA
Among the various technologies for the production of hydrogen fuel, heterogeneous photocatalysis is one of the most promising, especially with the use of semiconductors, notably TiO2. However, the use of TiO2 is limited by hindrances for the photolysis of water, such as wide bandgap, a less negative conduction band reduction potential as compared to that of
Quím. Nova. Publicado em: 2017-06
-
12. IMOBILIZAÇÃO DE DIÓXIDO DE TITÂNIO EM DIFERENTES MATERIAIS SUPORTE PARA O EMPREGO EM FOTOCATÁLISE HETEROGÊNEA
The technological bottleneck for the application of heterogeneous photocatalysis with titanium dioxide (TiO2) is the retention and reuse of the catalyst, which brings opportunities for studying techniques for its immobilization on solid supports. The main objective of this paper was to test different methods to effectively immobilize TiO2 on granular activat
Quím. Nova. Publicado em: 2016-08