Application of visible-light photocatalysis with nitrogen-doped or unmodified titanium dioxide for control of indoor-level volatile organic compounds

Jo, Wan-Kuen; Kim, Jong-Tae

doi:10.1016/j.jhazmat.2008.08.033

Cited by 144 publications

(89 citation statements)

References 45 publications

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“…The reference GF-TiO 2 photocatalyst displayed an absorption edge at λ ≈ 410 nm, which was consistent with that reported by other researchers (Jo and Kim, 2009;Sun et al, 2012). However, the absorption spectrum of the GF-Fe-TiO 2 composite was substantially shifted toward the visible-light region.…”

Section: Resultssupporting

confidence: 91%

“…Both the GF-Fe-TiO 2 composites and GF-TiO 2 displayed only anatase peaks, with a main peak at 2θ = 25.3°. This was different to the Degussa P25 TiO 2 photocatalyst, which revealed both anatase and rutile crystal phase peaks (Jo and Kim, 2009). However, our study is consistent with other reports (Cui et al, 2009;Tieng et al, 2011), which observed only anatase peaks in their XRD spectra.…”

Section: Resultsmentioning

confidence: 62%

“…A variety of materials have been explored as supports for TiO 2 nanopowders for the purification of airborne pollutants. These include powdered activated carbon (Matos et al, 2010), activated carbon fibers (Jo et al, 2011), glass tubes (Jo and Kim, 2009), polymer materials (Kedem et al, 2009), Teflon (Bianchi et al, 2012), steel (Bianchi et al, 2012), and glass fibers (GFs) (Lin et al, 2013). GFs have an obvious advantage over other supporting materials because of their flexibility, making them much easier to handle (Panniello et al, 2012;Lin et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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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

Yang

Tayade

et al. 2014

Journal of the Air & Waste Management Association

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Iron-functionalized titanium dioxide (TiO 2 ) composites with various Fe-to-Ti ratios were prepared on flexible glass fibers (GF-Fe-TiO 2 ) via a sol-gel method, followed by a dip-coating process. The photocatalytic ability of these composites in degrading selected volatile organic compounds (VOCs; benzene, toluene, ethylbenzene, and o-xylene [BTEX]) at indoor concentration levels was examined. The GF-Fe-TiO 2 composites were characterized using scanning electron microscopy, energy-dispersive X-ray elemental analysis, ultraviolet (UV)-visible spectroscopy, and X-ray diffraction. The GF-Fe-TiO 2 composites showed superior photocatalytic performance to that of a reference glass fiber-supported TiO 2 photocatalyst for the treatment of BTEX under visible light. However, this trend was reversed under UV irradiation. Specifically, the average BTEX photocatalytic efficiencies of the 0.01-GF-Fe-TiO 2 composite in a 3-hr visible-light photocatalytic process were 4%, 33%, 51%, and 74%, respectively. Conversely, the average BTEX photocatalytic efficiencies obtained for GF-TiO 2 were close to 0%, 5%, 16%, and 29%, respectively. These findings demonstrated that the GF-Fe-TiO 2 composites could be applied to photocatalytically purify BTEX, especially under visible-light exposure. Moreover, the GF-Fe-TiO 2 composites prepared with different Fe-to-Ti ratios displayed different BTEX photocatalytic decomposition efficiencies under visible or UV light, allowing for optimization of the Fe-to-Ti ratio (which was found to be 0.01).Implications: The application of nanomaterials for air purification necessitates a supporting material to stabilize them while in contact with the treated air in the photocatalytic chamber. Glass fibers have an obvious advantage over other supporting materials mainly because of its flexibility, which makes it much easier to handle. However, the applications of glass fibersupported, visible light-activated photocatalysts to the treatment of air pollutants are rarely reported in literature. Accordingly, this study aimed to investigate the applicability of glass fiber-supported Fe-TiO 2 for the purification of VOCs under visible-as well as UV-light exposure.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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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

Yang

Tayade

et al. 2014

Journal of the Air & Waste Management Association

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“…N-TiO2, along with pure TiO2. Pure TiO2 photocatalysts presented the absorption edge at λ ≈ 400 nm, which were consistent with the results obtained other studies [16][17][18]. However, for both Sand N-TiO2 photocatalysts, the light absorption region was redshifted.…”

Section: Surface Characteristics Of Photocatalystssupporting

confidence: 91%

“…Figure 2 illustrates the XRD patterns of pure TiO2 and S-and N-TiO2. For all types of photocatalysts, a major peak was appeared at (2θ = 25.2°), which is assigned to anatase crystal phase [12,16]. However, S-TiO2 and pure TiO2 showed a peak at 2θ = 27.4°, which is attributed to rutile crystal phase, whereas N-TiO2 did not.…”

Section: Surface Characteristics Of Photocatalystsmentioning

confidence: 92%

Photocatalysis of Sub-ppm-level Isopropyl Alcohol by Plug-flow Reactor Coated with Nonmetal Elements Irradiated with Visible Light

2012

Clean Technology

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주제어 : 질소 도핑, 황 도핑, 공기 유량, 아세톤 생성, 발광 다이오드Abstract : This work explored the characteristics and the photocatalytic activities of S element-doped TiO2 (S-TiO2) and N element-doped TiO2 (N-TiO2) for the decomposition of gas-phase isopropyl alcohol (IPA) at sub-ppm concentrations, using a plug-flow reactor irradiated by 8-W daylight lamp or visible light-emitting-diodes (LEDs). In addition, the generation yield of acetone during photocatalytic processes for IPA at sub-ppm levels was examined. The surface characteristics of prepared S-and N-TiO2 photocatalysts were analyzed to indicate that they could be effectively activated by visible-light irradiation. Regarding both types of photocatalysts, the cleaning efficiency of IPA increased as the air flow rate (AFR) was decreased. The average cleaning efficiency determined via the S-TiO2 system for the AFR of 2.0 L min -1 was 39%, whereas it was close to 100% for the AFR of 0.1 L min -1. Regarding the N-TiO2 system, the average cleaning efficiency for the AFR of 2.0 L min -1 was above 90%, whereas it was still close to 100% for the AFR of 0.1 L min -1 . In contrast to the cleaning efficiencies of IPA, both types of photocatalysts revealed a decreasing trend in the generation yields of acetone with decreasing the AFR. Consequently, the N-TiO2 system was preferred for cleaning of sub-ppm IPA to S-TiO2 system and should be operated under low AFR conditions to minimize the acetone generation. In addition, 8-W daylight lamp exhibited higher cleaning efficiency of IPA than for visible LEDs.

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The Environmental Impact of a Nanoparticle‐Based Reduced Need of Cleaning Product and the Limitation Thereof

Reijnders

2013

Self‐Cleaning Materials and Surfaces

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Application of visible-light photocatalysis with nitrogen-doped or unmodified titanium dioxide for control of indoor-level volatile organic compounds

Cited by 144 publications

References 45 publications

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

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

Photocatalysis of Sub-ppm-level Isopropyl Alcohol by Plug-flow Reactor Coated with Nonmetal Elements Irradiated with Visible Light

The Environmental Impact of a Nanoparticle‐Based Reduced Need of Cleaning Product and the Limitation Thereof

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