TiO2 as a photocatalyst for control of the aquatic invasive alga, Cladophora, under natural and artificial light

Peller, Julie; Whitman, Richard L.; Griffith, S.V.; Harris, Peter; Peller, Cassie; Scalzitti, Joanne M.

doi:10.1016/j.jphotochem.2006.08.009

Cited by 73 publications

(36 citation statements)

References 33 publications

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“…A number of researchers have previously reported the use of TiO2 coated spheres or spheres formed from titania for decomposition of contaminants in water [16][17][18][19][20][21]. Li et al [16,17] successfully degraded methylene blue and orange II with titanium dioxide covered hollow silica spheres.…”

Section: Introductionmentioning

confidence: 99%

“…Ren et al [19] produced hollow mesoporous TiO2 coated microspheres, however, they did not assess their photocatalytic efficiency. There have also been two studies which have reported the use of titania covered silica spheres of larger diameter (mm) for the control of algae/cyanobacteria [20,21]. These studies successfully targeted the growth of the organisms but did not explore the removal of any of their harmful metabolites.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres

Pestana

Edwards

Prabhu

et al. 2015

Journal of Hazardous Materials

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Microcystins and nodularin are toxic cyanobacterial secondary metabolites produced by cyanobacteria that pose a threat to human health in drinking water. Conventional water treatment methods often fail to remove these toxins. Advanced oxidation processes such as TiO2 photocatalysis have been shown to effectively degrade these compounds. A particular issue that has limited the widespread application of TiO2 photocatalysis for water treatment has been the separation of the nanoparticulate power from the treated water. A novel catalyst format, TiO2 coated hollow glass spheres (Photospheres™), is far more easily separated from treated water due to its buoyancy. This paper reports the photocatalytic degradation of eleven microcystin variants and nodularin in water using Photospheres™. It was found that the Photospheres™ successfully decomposed all compounds in 5 minutes or less. This was found to be comparable to the rate of degradation observed using a Degussa P25 material, which has been previously reported to be the most efficient TiO2 for photocatalytic degradation of microcystins in water.Furthermore, it was observed that the degree of initial catalyst adsorption of the cyanotoxins depended on the amino acid in the variable positions of the microcystin molecule. The fastest degradation (2 minutes) was observed for the hydrophobic variants (microcystin-LY, -LW, -LF). Suitability of UV-LEDs as an alternative low energy light source was also evaluated.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres

Pestana

Edwards

Prabhu

et al. 2015

Journal of Hazardous Materials

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show abstract

“…Some studies have shown that titanium has a beneficial effect on plants (Carvajal and Alcaraz, 1998), whereas others have reported negative effects such as iron and magnesium deficiencies (Bedrosian and Hanna, 1966) and depressed growth and chlorosis (Hara et al, 1976). Moreover, algal exposure to TiO 2 results in chlorophyll degradation due to its photocatalytic generation of oxidative species (Peller et al, 2007). Despite this result, the negative correlations detected between photobiont parameters (chlorophyll a, chlorophyll b, OD435/OD415) and winds passing through the BPP area suggest that at least some of the substances emitted by the power plant negatively affect the algal partner.…”

Section: Discussionmentioning

confidence: 99%

Local wind monitoring matched with lichen Pseudevernia furfuracea (L.) Zopf transplantation technique to assess the environmental impact of a biomass power plant

Lucadamo¹,

Corapi²,

Gallo³

2017

Turk J Bot

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“…Acting as electron acceptor, air oxygen can react with the electrons (e -) to form the superoxide radicalanion (O 2 -). Hydroxyl radicals (oxidants) and superoxides radical-anions (reductants) generated on TiO 2 have shown strong ability to degrade different micro-organisms (3)(4), almost all kinds of organic superoxidantes (reductores) generados sobre la superficie del TiO 2 han demostrado una gran capacidad para degradar diferentes tipos de microrganismos (3)(4), casi todos los tipos de contaminantes orgánicos (5-6) y otros compuestos inorgánicos tales como NO x (7) y SO 2 (5).…”

Section: Titanium Dioxide Photocatalysisunclassified

“…After 24 four hours of light exposure, the colour of the impregnated cubes was recovered between 75 and 95% (Figure 4), these different efficiencies were possibly due to the use of different catalyst types and different catalyst amounts in the mixes (22). En otra investigación, con el propósito de monitorizar la fotodegradación de colorantes orgánicos sobre materiales a base de cemento que contienen TiO 2 se propuso el cálculo de los factores R 4 y R 26 4 and R 26 which can be calculated as follows eqs. [3] and [4]:…”

Section: Self-cleaning On Cementitious Materialsmentioning

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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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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TiO2 as a photocatalyst for control of the aquatic invasive alga, Cladophora, under natural and artificial light

Cited by 73 publications

References 33 publications

Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres

Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres

Local wind monitoring matched with lichen Pseudevernia furfuracea (L.) Zopf transplantation technique to assess the environmental impact of a biomass power plant

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

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