Iron-functionalized titanium dioxide on flexible glass fibers for photocatalysis of benzene, toluene, ethylbenzene, and <i>o</i>-xylene (BTEX) under visible- or ultraviolet-light irradiation

Yang, Seung Choul; Hu, Chun; Tayade, Rajesh J.; Jo, Wan-Kuen

doi:10.1080/10962247.2014.995838

Cited by 29 publications

(22 citation statements)

References 32 publications

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“…As stated before, TiO 2 photocatalytic efficiency for environmental applications is limited because of charge carriers high recombination rate. TiO 2 photocatalytic activation is also limited under visible light given its wide band gap [86]. Some promising technologies for modifying TiO 2 that can improve environmental pollutants degradation have been proposed.…”

Section: Effect Of Dopingmentioning

confidence: 99%

“…Researchers have investigated the effects of transition metals such as manganese (Mn) [62], iron (Fe) [73,86,90], copper (Cu) [63,110], vanadium (V) [109], and nickel (Ni) [21] on reducing band gap, decreasing electron and hole recombination rate, and using visible light [10,90]. The type and amount of transition metals are two decisive parameters for PCO.…”

Section: Transition Metalmentioning

confidence: 99%

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TiO2 photocatalyst for removal of volatile organic compounds in gas phase – A review

Shayegan

Lee

Haghighat

2018

Chemical Engineering Journal

791

282

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Heterogeneous photocatalytic oxidation process (PCO) is a promising technology for removing indoor volatile organic compounds (VOCs) contaminants. Titanium dioxide (TiO 2 ) has been regarded as the most suitable photocatalyst for its cost effectiveness, high stability and great capability to degrade various VOCs. However, no TiO 2 -based photocatalysts completely satisfy all practical requirements given photoexcited charge carriers' short lifetime and a wide band gap requiring ultraviolet (UV) radiation. Strategies for improving TiO 2 photocatalyst activities by doping with different metal and/or non-metal ions and by coupling with other semiconductors have been examined and reported. These techniques can improve PCO performance through the following mechanisms: i) by introducing an electron capturing level in the band gap that would generate some defects in the TiO 2 lattice and help capture charge carriers; ii) by slowing down the charge carrier recombination rate and increasing VOCs degradation. This paper reports the outcomes of a comprehensive literature review of TiO 2 modification techniques that include approaches for overcoming the inherent TiO 2 limitations and improving the photocatalytic degradation of VOCs. Accordingly, it focuses on the recent development of modified-TiO 2 used for degrading gas phase pollutants in ambient conditions. Modification techniques, such as metal and non-metal doping, co-doping, and the heterojunction of TiO 2 with other semiconductors, are reviewed. A brief introduction on the basics of photocatalysis and the effects of controlling parameters is presented, followed by a discussion about TiO 2 photocatalyst modification for gas phase applications. The reported experimental results obtained with PCO for eliminating VOCs are also compiled and evaluated.

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Section: Effect Of Dopingmentioning

confidence: 99%

Section: Transition Metalmentioning

confidence: 99%

TiO2 photocatalyst for removal of volatile organic compounds in gas phase – A review

Shayegan

Lee

Haghighat

2018

Chemical Engineering Journal

791

282

View full text Add to dashboard Cite

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“…Most studies were focused on high concentration ranges of BTEX and were carried out in controlled laboratory conditions [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…According to the review articles [18][19][20][21][22], none of the available technologies was able to effectively remove all VOCs from indoor air. Ao et al [23] established less than 10% toluene removal at 2 ppm concentration using commercially available air cleaner unit (not specified).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Benzene, Toluene, Ethylbenzene and o-Xylene by Carbon-Based Adsorbents

et al. 2016

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This study explored the possibility of applying different carbon-based adsorbents for removal of benzene, toluene, ethylbenzene and o-xylene (BTEX) from indoor air in static and dynamic modes. To determine BTEX removal effectiveness, the approach based on solid-phase microextraction (SPME) in combination with gas chromatography -mass spectrometry (GC-MS) was used. In static mode, removal effectiveness of BTEX from indoor air using different carbon-based adsorbents (shungite, walnut shell, saxaul, apricot pits, activated charcoal, Tenax, carbon black) varied from 80% to 100%. Optimal preparation conditions for shungite-based adsorbent are no activation and addition of NaOH at 1:0.8 ratio. Shungite-based adsorbent was not able to remove BTEX from polluted indoor air at the flow rate 300 mL/min corresponding to the linear flow rate 25 cm/s, a minimum value for most commercial air purification systems. At the flow rate 75 mL/min (6.25 cm/s), a saturation time of shungite-based adsorbent made up 368 min for benzene and 437 min for toluene. At this flow rate, BTEX adsorption capacities of the shungitebased adsorbent were 0.3, 2.1, 0.2 and 0.3 µg/g, respectively. Compared to shungite, activated charcoal allowed the complete removal of BTEX at both flow rates in the whole studied time frame. Thus, shungite-based adsorbents are not recommended for BTEX removal from air because of much greater efficiencies of classic activated charcoal adsorbents. Applied methodology based on SPME-GC-MS allowed simple, fast and inexpensive collection of data and can be recommended as the analytical tool for developing new adsorbents and systems for air purification.

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“…In this way, the aforementioned problems may be solved. Many silicon materials are used as substrates to prepare nano-TiO 2 coated composite catalysts, such as quartz tube [ 18 ], glass fibers [ 19 ], and nano-silica [ 20 ]. These catalysts all exhibit the good photocatalytic activity with different functional characteristics.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Nano-TiO2-Coated SiO2 Microsphere Composite Material and Evaluation of Its Self-Cleaning Property

et al. 2017

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In order to improve the dispersion of nano-TiO2 particles and enhance its self-cleaning properties, including photocatalytic degradation of pollutants and surface hydrophilicity, we prepared nano-TiO2-coated SiO2 microsphere composite self-cleaning materials (SiO2–TiO2) by co-grinding SiO2 microspheres and TiO2 soliquid and calcining the ground product. The structure, morphology, and self-cleaning properties of the SiO2–TiO2 were characterized. The characterization results showed that the degradation efficiency of methyl orange by SiO2–TiO2 was 97%, which was significantly higher than that obtained by pure nano-TiO2. The minimum water contact angle of SiO2–TiO2 was 8°, indicating strong hydrophilicity and the good self-cleaning effect. The as-prepared SiO2–TiO2 was characterized by the nano-TiO2 particles uniformly coated on the SiO2 microspheres and distributed in the gap among the microspheres. The nano-TiO2 particles were in an anatase phase with the particle size of 15–20 nm. The nano-TiO2 particles were combined with SiO2 microspheres via the dehydroxylation of hydroxyl groups on their surfaces.

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Iron-functionalized titanium dioxide on flexible glass fibers for photocatalysis of benzene, toluene, ethylbenzene, and o-xylene (BTEX) under visible- or ultraviolet-light irradiation

Cited by 29 publications

References 32 publications

TiO2 photocatalyst for removal of volatile organic compounds in gas phase – A review

TiO2 photocatalyst for removal of volatile organic compounds in gas phase – A review

Adsorption of Benzene, Toluene, Ethylbenzene and o-Xylene by Carbon-Based Adsorbents

Preparation of Nano-TiO2-Coated SiO2 Microsphere Composite Material and Evaluation of Its Self-Cleaning Property

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