Selective photocatalytic degradation of aquatic pollutants by titania encapsulated into FAU-type zeolites

Zhang, Guan; Choi, Wonyong; Kim, Seok Han; Hong, Suk Bong

doi:10.1016/j.jhazmat.2011.01.105

Cited by 93 publications

(35 citation statements)

References 35 publications

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“…For example, Chen and co-workers [24] synthesized mesoporous TiO2@SiO2 nanofibers for the selective photocatalytic decomposition of organic dyes, which was due to the size selectivity of the SiO2 shell. Choi and co-workers [25] reported that the incorporation of titania within FAU-type zeolites produced a catalyst with size and charge selectivity for the photocatalytic degradation of charged pollutants.…”

Section: Introductionmentioning

confidence: 99%

Carbon coated Au/TiO2 mesoporous microspheres: a novel selective photocatalyst

Liu

Wang

et al. 2017

Sci. China Mater.

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Photocatalysts with desirable selectivity to transformation and purification of targeted pollutants are of great importance in water purification. Here, we demonstrate that selective photocatalysis can be realized by the assistance of gold-enhanced selective adsorption onto carbon-coated Au/TiO2 mesoporous microspheres (Au/TiO2@C-MM), which were prepared via a surfactant-assisted two-step method that involved the assembly of oleic acid-stabilized titania and gold nanoparticles into colloidal spheres in an emulsion using sodium dodecyl sulfate as a surfactant and the conversion of the surfactants into carbon under annealing in Ar. Due to the negatively charged amorphous carbon, the mesoporous structure, and the surface plasmon resonance absorption of the Au components, the Au/TiO2@C-MM shows enhanced charge-and size-selective adsorption properties, which enables the materials to have high selectivity in the photocatalytic process.

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Section: Introductionmentioning

confidence: 99%

Carbon coated Au/TiO2 mesoporous microspheres: a novel selective photocatalyst

Liu

Wang

et al. 2017

Sci. China Mater.

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“…The selective degradation of contaminants is another promising area in photocatalytic water treatment. Selective degradation could be useful for mixtures of highly toxic pollutants in low concentrations and less harmful compounds in higher concentrations [17,18]. The former can be degraded by means of NTO photocatalysis, whereas the latter can be removed by less-expensive biological wastewater treatments [18].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Water Treatment by Titanium Dioxide: Recent Updates

Varghese²,

2012

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Photocatalytic water treatment using nanocrystalline titanium dioxide (NTO) is a well-known advanced oxidation process (AOP) for environmental remediation. With the in situ generation of electron-hole pairs upon irradiation with light, NTO can mineralize a wide range of organic compounds into harmless end products such as carbon dioxide, water, and inorganic ions. Photocatalytic degradation kinetics of pollutants by NTO is a topic of debate and the mostly reporting Langmuir-Hinshelwood kinetics must accompanied with proper experimental evidences. Different NTO morphologies or surface treatments on NTO can increase the photocatalytic efficiency in degradation reactions. Wisely designed photocatalytic reactors can decrease energy consumption or can avoid post-separation stages in photocatalytic water treatment processes. Doping NTO with metals or non-metals can reduce the band gap of the doped catalyst, enabling light absorption in the visible region. Coupling NTO photocatalysis with other water-treatment technologies can be more beneficial, especially in large-scale treatments. This review describes recent developments in the field of photocatalytic water treatment using NTO.

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“…The photocatalysts were anchored on adsorbents to prepare the composites and the composites possess the following advantages: (1) adsorbents can concentrate the targeted pollutants on the surface of photocatalysts from the diluted water to promote the pollutant transfer process, thus increase the photocatalytic efficiency; (2) adsorbents can capture intermediate products without producing possible secondary pollution; (3) pollutants adsorbed on the surface of photocatalysts can be degraded to make the adsorbents regeneration; (4) the TiO 2 loaded on the adsorbents has less agglomeration phenomenon compared to the suspended powder TiO 2 . Common adsorbents include zeolites [17][18][19][20], silica [21][22][23], montmorillonite [24][25][26] and carbonaceous materials [27]. Among them, carbonaceous materials, such as activated carbon (AC) [28][29][30], bamboo charcoal [31] and activated carbon fiber [32] have already been used as supports to load TiO 2 because of their large specific surface area and pore volume resulting in excellent adsorption capacity for pollutants.…”

Section: Introductionmentioning

confidence: 99%