Synthesis, structural characterization and evaluation of sol–gel-based NF-TiO2 films with visible light-photoactivation for the removal of microcystin-LR☆

Pelaez, Miguel; Falaras, Polycarpos; Likodimos, V.; Kontos, Athanassios G.; Cruz, Armah A. de la; Ο'Shea, Kevin Ε.; Dionysiou, Dionysios D.

doi:10.1016/j.apcatb.2010.06.017

Cited by 171 publications

(108 citation statements)

References 59 publications

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“…MC-LR has been selected as target contaminant since it has been intensively investigated due to its continuous presence in higher concentrations than the provisional guideline for potable water proposed by the World Health Organization (1 µg/L), it has high toxicity, and it has been reported to cause health-related effects in humans and animals around the world. Previous work indicates that MC-LR can be subject to photocatalytic degradation with conventional and non-metal doped TiO 2 under UV and visible light [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Influence of the chemical synthesis on the physicochemical properties of N-TiO2 nanoparticles

et al. 2013

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Abstract.Nitrogen doped TiO 2 materials were successfully prepared following three different preparation routes (sol-gel, hydrothermal and pyrolysis) and characterized by various spectroscopic techniques.All samples absorbed radiation in the visible range and were active in the photocatalytic degradation of cyanotoxin microcystin-LR under visible light and in acidic conditions. The different preparation routes led to the formation of various impurities into the solids. In the case of hydrothermal and sol-gel samples, these impurities were weakly bound at the surface whereas the materials prepared by pyrolysis, the impurities showed a relevant stability and could not be removed even at high temperature. On the basis of the photocatalytic data illustrated in this paper, the presence of such species was not detrimental for the photocatalytic activity of nitrogen doped TiO 2 but actually contributed to a higher interaction with the target cyanotoxin; leading to a higher photocatalytic activity than that observed for samples prepared via the classic sol-gel method.

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Section: Introductionmentioning

confidence: 99%

Influence of the chemical synthesis on the physicochemical properties of N-TiO2 nanoparticles

et al. 2013

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“…After combining with graphene oxide (GO), the GO-TiO 2 composites showed higher photocatalytic activities than that of TiO 2 nanorods alone for the inactivation of E. coli under solar simulated light. Pillai and co-workers 7 have highlighted recombination of photogenerated charge carriers is 85 the major limitation in semiconductor photocatalysis as it reduces the over-all quantum efficiency (Figure 10). Both hetero-junction semiconductor coupling and nanosized crystals (Figure 11) have been reported to reduce such carrier recombination and thereby an increased the photocatalytic efficiency in the visible region.…”

Section: New Nanoscale Materials Nanocomposites and Heterojunctions mentioning

confidence: 99%

“…Hence, alternative indicators are used to evaluate water treatments: somatic coliphages (SOMCPH), F-specific RNA phages (FRNA) and bacteriophages infecting Bacteroides are 80 used as viral indicators 90 , and spores of sulphite-reducing clostridia (SRC) are used as indicators of oocysts of Cryptosporidium sp. 91 Bandala et al 92 have recently used an azo dye, Acid orange 24 (AO24), as a visual dosimetric indicator to measure the solar radiation dose required to inactivate helminth 85 ova in a homogeneous photocatalytic system (photo-Fenton process). It was found that the solar radiation dose required for complete dye degradation, in which there is a visual change in colour from red to colourless, was comparable to that required helmith ova inactivation.…”

Section: 5mentioning

confidence: 99%

“…Two out of the four sides of the square bottles were coated. Acrylic bottles 85 were chosen as an alternative to PET bottles due to its greater UV transparency. The photocatalytic activity of the coated and uncoated bottles were evaluated by inactivation of E. coli and the degradation of microcystin-LR and methyl orange.…”

Section: Solar Photocatalytic Disinfection Of Water; Selected Fieldmentioning

confidence: 99%

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Solar photocatalysis for water disinfection: materials and reactor design

Keane

McGuigan

Ibáñez³

et al. 2014

Catal. Sci. Technol.

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173

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As of 2010, access to clean drinking water is a human right according to UN regulations. Nevertheless, the number of people living in areas without safe drinking water is predicted to increase by three billion by the end of this decade. Several recent cases of E. coli and Cryptosporidium contamination in drinking water are also reported in a number of advanced countries. Therefore ensuring the potability of drinking water is urgent, but highly challenging to both the developing and developed world in the future. A combination of solar disinfection and photocatalysis technology offers real possibilities for removing lethal pathogenic microroganisms from drinking water. The time taken for the conventional SODIS process can be greatly reduced by semiconductor (e.g. TiO2, ZnO, nano-heterojunctions) based photocatalysis. This review addresses the fundamental reaction mechanism, advances in materials synthesis and selection and recent developments in the reactor design for solar energy driven photocatalysis using titanium dioxide. The major advantage of using photo-reactors is that they enhance disinfection by increasing photon flux into the photocatalyst. Other major factors affecting such efficiency of solar-based photocatalysis such as the illuminated volume/total volume ratio, catalyst load and flow rate, are discussed in detail. The significance of using immobilised catalysts over the catalyst powder in slurries is also highlighted. It is noted that, despite encouraging early field studies, the commercialisation and mass production of solar photocatalysis systems remains highly challenging. Recommendations for future directions for addressing issues such as mass transfer, requirement of a standard test method, photo-reactors design and visible light absorption by TiO2 coatings are also discussed

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“…Titania (TiO 2 ) as the best semiconducting material has been widely employed in energy and environmental areas (1-3), such as dye sensitizer solar cell (DSSC) (4,5), photocatalytic water splitting to generate hydrogen (6)(7)(8), and photocatalytic purification of wastewater (9,10), etc., due to its low cost, photostability in the solution, nontoxicity, redox selectivity and strong oxidizing power of holes (11). However, the wide bandgap energy barrier and recombination of photogenerated electron/hole pairs restrict its broader application (12).…”

Section: Introductionmentioning

confidence: 99%

Mono- and Dual-modified Titania with a Ruthenium(II) Complex and Silver Nanoparticles for Photocatalytic Degradation of Organic Compounds

Zheng

Wang

Wei

et al. 2016

Journal of Advanced Oxidation Technologies

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Abstract:Ruthenium(II) complex with the phosphonate anchoring groups of [Ru(tbbpy) 2 (4,4′-(CH 2 PO 3 H 2 ) 2 bpy)] 2+ (Ru II CP2, tbbpy= 4,4′-di-tert-butyl-2,2′-bipyridine) and silver nanoparticles (Ag NPs) were used as single or comodifiers on titania surface. For the dual modified titania, two deposition sequences were applied to obtain Ag/Ru II CP2 and Ru II CP2/Ag, in which at first ruthenium(II) or silver was deposited on titania, respectively. Diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed the existence of modifiers, and the effect of ruthenium(II) on the properties of Ag NPs regarding their crystallite sizes and oxidation states distributions. Photocatalytic activities of the modified titania were investigated for oxidative decomposition of acetic acid and 2-propanol, and anaerobic dehydrogenation of methanol. Under UV/Vis irradiation for the methanol dehydrogenation, co-modified titania of Ag/Ru II CP2 showed the best activity, while for acetic acid degradation, singly modified titania with silver showed the highest activity. In contrary, under visible light irradiation, singly fabricated titania with ruthenium(II) complex possessed the highest photocatalytic performance for 2-propanol oxidation. For all the three tested photocatalytic degradation reactions, Ag/Ru II CP2 exhibited better photocatalytic activities than Ru II CP2/Ag, indicating the different properties caused by opposite deposition sequences, e.g., DRS indicated the smaller sizes of metal NPs and XPS suggested the binding of ruthenium(II) to Ag NPs for Ru II CP2/Ag, which in consequence influenced the overall photocatalytic outcome.

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Synthesis, structural characterization and evaluation of sol–gel-based NF-TiO2 films with visible light-photoactivation for the removal of microcystin-LR☆

Cited by 171 publications

References 59 publications

Influence of the chemical synthesis on the physicochemical properties of N-TiO2 nanoparticles

Influence of the chemical synthesis on the physicochemical properties of N-TiO2 nanoparticles

Solar photocatalysis for water disinfection: materials and reactor design

Mono- and Dual-modified Titania with a Ruthenium(II) Complex and Silver Nanoparticles for Photocatalytic Degradation of Organic Compounds

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