Control of the photocatalytic activity of TiO2 nanoparticles by silica coating with polydiethoxysiloxane

Siddiquey, Iqbal Ahmed; Furusawa, Takeshi; Sato, Masahide; Honda, Kozue; Suzuki, Noboru

doi:10.1016/j.dyepig.2007.01.020

Cited by 79 publications

(45 citation statements)

References 13 publications

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“…Yet, the inline addition of TiO2 to the silica membranes did not significantly change the removal rate compared to non-functionalized samples. This can be explained by the shielding of TiO2 by the silica [36][37][38]. However, very interesting, the rate constants of dipcoated samples are significantly higher than those of inline functionalized samples for both PA 6 and silica.…”

Section: Photocatalytic Behavior Of Tio2 Functionalized Membranesmentioning

confidence: 81%

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

Geltmeyer

Teixido

Meire

et al. 2017

Separation and Purification Technology

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Abbreviations 1 1 PA 6: polyamide 6, MB: Methylene Blue, IL: inline, DC: dip-coating, H: hydrophilic 2 ABSTRACT Titania has already proven its added value for air and water treatment. The higher the surface-to-volume area, the better the performance of the TiO2 photocatalyst. These nanoparticles are typically applied in a slurry form. The use of titania nanoparticles in suspension has, however, multiple disadvantages such as a high turbidity and complex recovery of the photocatalyst after use. Therefore, immobilization of titania nanoparticles on a porous support such as a nanofibrous membrane, can be highly valuable for water treatment. These TiO2 functionalized nanofibrous membranes may be used not only in a membrane separation reactor, but also in a contact reactor. In this study, TiO2 nanoparticles were immobilized on both polymer (polyamide 6) and ceramic (silica) nanofibrous membranes. Polymer nanofibers are chosen as they are the state-of-the-art material, silica nanofibers on the contrary are less studied but show additional advantages due their excellent chemical and thermal stability and can thus offer a clear benefit for a wider range of applications. Two immobilization techniques were used, namely inline functionalization and dip-coating. Inline functionalization showed to be the preferred method for polyamide 6 nanofibrous membranes, dip-coating for silica nanofibrous membranes. Complete degradation of isoproturon, an actual concern in water treatment, is shown. Even the widely available commercial TiO2 nanoparticles allowed for a complete isoproturon removal as the result of a correct immobilization process on nanofibrous materials. This clearly opens up the high value of TiO2 functionalized nanofibrous membranes for organic (micro)pollutants removal.

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Section: Photocatalytic Behavior Of Tio2 Functionalized Membranesmentioning

confidence: 81%

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

Geltmeyer

Teixido

Meire

et al. 2017

Separation and Purification Technology

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“…However, TiO 2 powders have strong photocatalytic activity especially under ultraviolet radiation, resulting in the oxidation of organic matrixes and decreasing their weatherability [1,2]. On the other hand, TiO 2 powders with submicrometer size have a tendency to form aggregates, giving a lower dispersion extent in matrixes.…”

Section: Introductionmentioning

confidence: 99%

Evolution mechanism of alumina coating layer on rutile TiO2 powders and the pigmentary properties

Liu

Zhang

Chen

et al. 2009

Applied Surface Science

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“…Recently, a number of investigations have been published on the direct silica coating of colloidal particles of metal [21][22][23][24][25][26], metal oxide [27][28][29][30][31][32][33][34] and semiconductors [35] based on Stöber method [36]. This process typically involves ammonia-catalyzed hydrolysis and condensation of molecules, such as tetraethoxysilane (TEOS).…”

Section: Introductionmentioning

confidence: 99%

Fast and facile synthesis of silica coated silver nanoparticles by microwave irradiation

Bahadur

Furusawa

Sato

et al. 2011

Journal of Colloid and Interface Science

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Control of the photocatalytic activity of TiO2 nanoparticles by silica coating with polydiethoxysiloxane

Cited by 79 publications

References 13 publications

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

Evolution mechanism of alumina coating layer on rutile TiO2 powders and the pigmentary properties

Fast and facile synthesis of silica coated silver nanoparticles by microwave irradiation

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