Listar Ciencias Exactas y Naturales por tema "Photocatalysis"
Mostrando ítems 1-12 de 12
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A comparison of slurry and immobilized TIO2 in the photocatalytic degradation
(2012) [Artículo de periódico]The photocatalytic degradation of phenol was studied using slurry and immobilized TiO2 as catalysts in order to compare the specific reaction rate constants, ks and kp. Losses from phenol evaporation, the time necessary ... -
Degradação fotocatalítica do fungicida tebuconazole em solução aquosa
(2010) [Artículo de periódico]The tebuconazole photocatalytic degradation kinetics was studied in a batch reactor using TiO2 (P25-Degussa) as catalyst and a high pressure mercury lamp. The photolysis, adsorption and irradiation effects in the reaction ... -
Growth of TiO2 nanotube arrays with simultaneous Au nanoparticles impregnation: photocatalysts for hydrogen production
(2010) [Artículo de periódico]Um novo método para a fabricação de nanotubos (NTs) de TiO2 organizados e impregnados com nanopartículas (NPs) de ouro foi desenvolvido, e as propriedades estruturais, morfológicas e ópticas dos NTs obtidos foram investigadas. ... -
Incorporação de dióxido de titânio em zeólitas para emprego em fotocatálise heterogênea
(2010) [Artículo de periódico]This work proposes the study of heterogeneous photocatalysis using TiO2 impregnated in zeolites beta, ZSM-5, mordenite, NaXb, NaXp and NaY for the decomposition of methylene blue. The catalysts were characterized by XRD, ... -
Materiais SiO2-TiO2 para a degradação fotocatalítica de diuron
(2011) [Artículo de periódico]SiO2-TiO2 materials prepared by sol-gel method were evaluated in the photocatalytic degradation of diuron. The materials were prepared with and without surfactant cetyltrimethylammonium chloride at different temperatures ... -
Nanotubos de TiO2 dopados com nitrogênio : comparação das atividades fotocatalíticas de materiais obtidos através de diferentes técnicas
(2012) [Artículo de periódico]TiO2 nanotubes were synthesized by hydrothermal method and doped with three nitrogen compounds to enhance photocatalytic activity under visible light. Catalysts were characterized by X-ray diffraction (XRD), transmission ... -
Photocatalytic studies of tio2/sio2 nanocomposite xerogels
(2017) [Artículo de periódico]The use of titania-silica materials in photocatalytic processes has been proposed as an alternative to the conventional TiO2 catalysts, in order to facilitate the separation of products after the reaction. However, despite ... -
Photocatalytic water splitting with noble-metal free cocatalysts for a comprehensive study of two nonidentical photoreactors designs
(2020) [Artículo de periódico]Here, the authors (i) discuss the most prominent co-catalyst for H2 generation struc tured in the form of Me-TiO2/MCM-41 (Me: Ag, Co, Cu, Ni) based on structural, electronic, textural, morphological and optical characterization ... -
Síntese, caracterização e atividade fotocatalítica de catalisadores nanoestruturados de TiO2 dopados com metais
(2013) [Artículo de periódico]Titanium dioxide nanostructured catalysts (nanotubes) doped with different metals (silver, gold, copper, palladium and zinc) were synthesized by the hydrothermal method in order to promote an increase in their photocatalytic ... -
A study of process variables for the photocatalytic degradation of rhodamine B
(2007) [Artículo de periódico]The photoactivated degradation reaction of rhodamine B (RB) was studied using P-25 TiO2 (Degussa) as catalyst. Three process variables – temperature, initial pH, and catalyst concentration – were evaluated. Temperature had ... -
Styrene photocatalytic degradation reaction kinetics
(2011) [Artículo de periódico]A reação de degradação fotocatalítica do estireno foi estudada utilizando-se TiO2 P-25 (Degussa) como catalisador. Os experimentos foram realizados em um reator “slurry” em bateladas, com controle de temperatura, empregando-se ... -
Tungsten oxide thin films grown by thermal evaporation with high resistance to leaching
(2014) [Artículo de periódico]Óxidos de tungstênio apresentam diferentes estequiometrias, estruturas cristalinas e morfologias. Estas características são importantes principalmente quando se deseja utilizá-los como fotocatalisadores. Neste trabalho ...
