A low-cost photoactive composite quartz sand/TiO2

Tokarský, Jonáš; Matějka, Vlastimil; Neuwirthová, Lucie; Vontorová, Jiřina; Kutláková, Kateřina Mamulová; Kukutschová, Jana; Čapková, Pavla

doi:10.1016/j.cej.2013.02.056

Cited by 31 publications

(15 citation statements)

References 37 publications

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“…Titanium dioxide (TiO 2 ), a direct wide band-gap (3.2 eV) semiconductor, is one of the most important functional transition-metal oxides due to its superior physical and chemical properties such as long-term stability against chemical corrosion and photocorrosion, strong oxidizing ability, facile preparation and low cost [21][22][23], which makes it widely used in photo-catalysis [24], high-performance hydrogen sensors [25], electro-chemical [26], dye-sensitized solar cell [27][28][29], and detoxification [30]. In recent years, considerable effort has been devoted to fabricating various TiO 2 nanostructures and morphologies, including TiO 2 spheres [31,32], nanorods [33], nanotubes [34,35], sheets [36], nanofibers [37], and other hierarchical nanostructures [38,39].…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of porous TiO2 nanospheres and their photocatalytic properties

Huang

Ren

Liu

et al. 2015

Superlattices and Microstructures

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Section: Introductionmentioning

confidence: 99%

Facile synthesis of porous TiO2 nanospheres and their photocatalytic properties

Huang

Ren

Liu

et al. 2015

Superlattices and Microstructures

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“…TiO 2 -quartz composites Although molecular modeling by Tokarsky et al 16 indicated the possibility of Ti-O-Si on sand quartz, they were not able to observe clear evidence for Ti-O-Si experimentally following thermal hydrolysis of titanyl sulphate in the presence of quartz. However, as can be seen from Figure 5 , a very low IR absorption can be noticed in the range 920 - 960 cm -1 for comparable QT1 composites in this study indicating a small amount of Ti-O-Si bonding.…”

Section: Representative Resultsmentioning

confidence: 96%

“…Obtain X-ray diffraction (XRD) patterns using a PAN analytical diffractometer equipped with a CuKa1 1.54 Å X-ray source 16 .…”

Section: Protocolmentioning

confidence: 99%

The Effect of Interfacial Chemical Bonding in TiO<sub>2</sub>-SiO<sub>2</sub> Composites on Their Photocatalytic NOx Abatement Performance

Hakki

Yang

Wang

et al. 2017

JoVE

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The chemical bonding of particulate photocatalysts to supporting material surfaces is of great importance in engineering more efficient and practical photocatalytic structures. However, the influence of such chemical bonding on the optical and surface properties of the photocatalyst and thus its photocatalytic activity/reaction selectivity behavior has not been systematically studied. In this investigation, TiO2 has been supported on the surface of SiO2 by means of two different methods: (i) by the in situ formation of TiO2 in the presence of sand quartz via a sol-gel method employing tetrabutyl orthotitanium (TBOT); and (ii) by binding the commercial TiO2 powder to quartz on a surface silica gel layer formed from the reaction of quartz with tetraethylorthosilicate (TEOS). For comparison, TiO2 nanoparticles were also deposited on the surfaces of a more reactive SiO2 prepared by a hydrolysis-controlled sol-gel technique as well as through a sol-gel route from TiO2 and SiO2 precursors. The combination of TiO2 and SiO2, through interfacial Ti-O-Si bonds, was confirmed by FTIR spectroscopy and the photocatalytic activities of the obtained composites were tested for photocatalytic degradation of NO according to the ISO standard method (ISO 22197−1). The electron microscope images of the obtained materials showed that variable photocatalyst coverage of the support surface can successfully be achieved but the photocatalytic activity towards NO removal was found to be affected by the preparation method and the nitrate selectivity is adversely affected by Ti-O-Si bonding.

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“…The traditional immobilization solid supports such as glass , stainless steel , quartz , activated carbon , and cementitious materials have been systematically studied during past decades, but they mainly served for TiO 2 immobilization, and seldom focused on the immobilization of Ag/AgX/TiO 2 composites. In recent years, some porous and bioactive substrates including apatite , rectorite , fly ash , and cotton were employed as supports for immobilizing Ag/AgX/TiO 2 composites.…”

Section: Introductionmentioning

confidence: 99%

The Visible‐Light Photocatalytic Activity and Antibacterial Performance of Ag/AgBr/TiO₂ Immobilized on Activated Carbon

Yang

Liu

et al. 2016

Photochem & Photobiology

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Visible-light-driven Ag/AgBr/TiO /activated carbon (AC) composite was prepared by solgel method coupled with photoreduction method. For comparison, TiO , TiO /AC, and Ag/AgBr/TiO were also synthesized. Their characteristics were analyzed by XRD, SEM-EDS, TG-DSC and UV-vis techniques. Photocatalytic activity and antibacterial performance under visible-light irradiation were investigated by ICP-AES, ATR-FT-IR and spectrophotometry methods using methylene blue and Escherichia coli as target systems, respectively. The results showed that Ag/AgBr was successfully deposited on anatase TiO /AC surface, and exhibited a distinct light absorption in the visible region. Ag/AgBr/TiO /AC displayed excellent antibacterial performance both in dark and under visible-light illumination. The growth of E. coli cell was inhibited in the presence of Ag/AgBr/TiO /AC in dark. Moreover, upon visible-light illumination, a significant damage of cell membrane was noticed. Ag/AgBr/TiO /AC was also shown higher photocatalytic efficiency for methylene blue degradation than those of TiO , TiO /AC, and Ag/AgBr/TiO . This is attributed to the synergetic effect between AC and Ag/AgBr/TiO , of which AC acts as the role of increasing reaction areas, continuous enriching, and transferring the adsorbed MB molecules to the surface of supported photocatalysts, and the Ag/AgBr/TiO acts as a highly active photocatalyst for degrading MB molecules under visible-light irradiation.

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A low-cost photoactive composite quartz sand/TiO2

Cited by 31 publications

References 37 publications

Facile synthesis of porous TiO2 nanospheres and their photocatalytic properties

Facile synthesis of porous TiO2 nanospheres and their photocatalytic properties

The Effect of Interfacial Chemical Bonding in TiO<sub>2</sub>-SiO<sub>2</sub> Composites on Their Photocatalytic NOx Abatement Performance

The Visible‐Light Photocatalytic Activity and Antibacterial Performance of Ag/AgBr/TiO₂ Immobilized on Activated Carbon

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A low-cost photoactive composite quartz sand/TiO2

Cited by 31 publications

References 37 publications

Facile synthesis of porous TiO2 nanospheres and their photocatalytic properties

Facile synthesis of porous TiO2 nanospheres and their photocatalytic properties

The Effect of Interfacial Chemical Bonding in TiO<sub>2</sub>-SiO<sub>2</sub> Composites on Their Photocatalytic NOx Abatement Performance

The Visible‐Light Photocatalytic Activity and Antibacterial Performance of Ag/AgBr/TiO2 Immobilized on Activated Carbon

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The Visible‐Light Photocatalytic Activity and Antibacterial Performance of Ag/AgBr/TiO₂ Immobilized on Activated Carbon