Environmental green chemistry as defined by photocatalysis

Herrmann, J. M.; Duchamp, Christian; Karkmaz, Maithaa; Hoai, Bui Thu; Lachheb, Hinda; Puzenat, E.; Guillard, C.

doi:10.1016/j.jhazmat.2007.04.095

Cited by 215 publications

(108 citation statements)

References 11 publications

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“…Inicialmente, las propiedades antibacteriales del TiO 2 fueron utilizadas en sistemas de purificación de aire y agua (12)(13)(14). Posteriormente, fueron desarrolladas baldosas cerámicas con recubrimientos de dióxido de titanio con el fin de crear propiedades antisépticas en hospitales, escuelas, cocinas y duchas (15).…”

Section: Titanium Dioxide Photocatalysisunclassified

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Estado del arte de los materiales a base de cemento que contienen TiO<sub>2</sub>: propiedades auto-limpiantes

Maury¹,

Belie²

2010

Mater. construcc.

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RESUMENDebido a las características físico-químicas de los materiales a base de cemento, la calidad estética de estos materiales tiende a disminuir con facilidad. Por otra parte, la actividad fotocatalítica producida por los materiales a base de cemento que contienen TiO 2 , ha permitido incorporar recientemente en estos materiales propiedades de auto-limpieza y purificación del aire. Sin embargo, actualmente sólo existe en el mercado un número limitado de dichos materiales, dado que aún se necesita conocer mejor las mencionadas propiedades. Para mejorar esta situación, se vienen desarrollando ensayos no estandarizados donde se evalúa la foto-degradación de colorantes orgánicos producida por los diferentes materiales. Por tanto, se han producido una gran cantidad de resultados no fácilmente comparables entre sí. Este artículo presenta una descripción de los diferentes ensayos de laboratorio desarrollados, así como una evaluación del potencial de auto-limpieza de los primeros edificios que contienen TiO 2 . Finalmente, se identifican los futuros desafíos de investigación en este campo.Palabras clave: dióxido de titanio, fotocatálisis, autolimpieza, materiales a base de cemento, colorantes orgá-nicos. SUMMARYDue to the physico-chemical characteristics of cementitious materials the aesthetic quality of these materials tend to decrease easily. On the other hand, the photocatalytic activity produced by TiO 2 loaded cementitious materials have recently allowed them to include self-cleaning and air-purifying properties. However, because a better understanding of these properties is still needed, only a limited number of these materials is present in the construction market. As a strategy to improve this situation, non standards tests based on photodegradation of organic dyes have become widely used to evaluate the photocatalytic action of the different materials. Today, a wide spectrum of non easily comparable results have been produced. In order to improve this situation, this paper focuses on the description of the developed laboratory tests as well as on the evaluation of the self-cleaning potential of the first buildings containing TiO 2 . Finally, future research challenges in this field are identified.K Ke ey yw wo or rd ds s: : titanium dioxide, photocatalysis, self-cleaning, cementitious materials, organic dyes.( * ) Ghent University, Gante, Bélgica.Persona de contacto/Corresponding author: Nele.DeBelie@UGent.be INTRODUCCIÓNLos materiales a base de cemento, especialmente aquellos expuestos a la intemperie, presentan un proceso de deterioro acelerado debido a la exposición continua y directa a muchos contaminantes atmosféricos (orgánicos, inorgánicos y material en partículas) y a diferentes tipos de micro-organismos (tales como algas, hongos y cyanobacterias). A lo anterior, se le suman los cambios frecuentes en las condiciones ambientales a los que están sometidos. Esta situación puede producir, en muchos casos, importantes cambios en las propiedades de los materiales, especialmente en las propiedades estéticas...

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Section: Titanium Dioxide Photocatalysisunclassified

“…Initially, the antibacterial properties of titanium dioxide were used in air and water purification systems (12)(13)(14). Then, ceramic tiles with titanium dioxide coatings were developed for creating antiseptic properties in hospitals, schools, kitchens and baths (15).…”

Section: Titanium Dioxide Photocatalysismentioning

confidence: 99%

Estado del arte de los materiales a base de cemento que contienen TiO<sub>2</sub>: propiedades auto-limpiantes

Maury¹,

Belie²

2010

Mater. construcc.

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“…Refer to previous researches [15,16], the generation of hydroxy radicals and its relationship with photoactivity can be figured by following reaction mechanism:…”

Section: Resultsmentioning

confidence: 99%

Preparation of TiO2-SiO2 using Rice Husk Ash as Silica Source and The Kinetics Study as Photocatalyst in Methyl Violet Decolorization

Fatimah

Said

Hasanah

2014

Bull. Chem. React. Eng. Catal.

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Preparation, characterization and utilization of TiO2-SiO2 as photocatalyst for methyl violet (MV) decolorization has been conducted. In this research, preparation of TiO2-SiO2 was developed based on natural renewable silica source; rice husk ash (RHA) via a sol-gel technique. The composite was formed by the dispersing of titanium isopropoxide as titania precursor into the gel of silica followed by aging, drying and calcination. The TiO2-SiO2 sample was characterized by powder X-ray diffraction (XRD), diffuse reflectance-UV Visible spectrophotometric analysis (DRUV-Vis), gas sorption analyzer and Scanning electron micrograph (SEM) before its utilization as photocatalyst in methyl violet photooxidation. As comparison to the physicochemical character study, the synthesis of TiO2-SiO2 by using tetraethyl ortosilicate (TEOS) was performed as a confirmation. Result showed that prepared TiO2-SiO2 has the character similar to TiO2-SiO2 as synthesized by TEOS precursor. The formation of crystalline titania in anatase and rutile phase was identified with increasing surface porosity data and the value of band gap energy which sufficiently contribute to a photocatalytic mechanism. The character data are in line with the kinetic data of methyl violet decolorization. From the compared photooxidation, photolysis, photocatalysis and adsorption process, it can be concluded that TiO2-SiO2 acts efficiently as a photocatalyst.

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“…Uma das áreas com maior destaque nessas pesquisas foi, e ainda é, a de catálise, cujo objetivo é a maximização das reações e redução da formação de subprodutos indesejáveis durante o processo. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Isso pode ser, obviamente, atribuído a algumas características importantes dos catalisadores e sua importância econô-mica. Em geral, as sínteses catalíticas, devido à elevada seletividade, são mais eficientes, limpas e econômicas, permitem a reutilização do catalisador, o uso de matérias-primas renováveis ou a redução de reagentes, sendo superiores aos reagentes estequiométricos.…”

Section: A Temática Química Verde Nos Periódicos Científicosunclassified

Vinte anos de química verde: conquistas e desafios

Farias¹,

Fávaro²

2011

Quím. Nova

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Environmental green chemistry as defined by photocatalysis

Cited by 215 publications

References 11 publications

Estado del arte de los materiales a base de cemento que contienen TiO<sub>2</sub>: propiedades auto-limpiantes

Estado del arte de los materiales a base de cemento que contienen TiO<sub>2</sub>: propiedades auto-limpiantes

Preparation of TiO2-SiO2 using Rice Husk Ash as Silica Source and The Kinetics Study as Photocatalyst in Methyl Violet Decolorization

Vinte anos de química verde: conquistas e desafios

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