Composite TiO2/clays materials for photocatalytic NOx oxidation

Todorova, N.; Giannakopoulou, T.; Karapati, S.; Petridis, D.; Vaimakis, T.; Trapalis, C.

doi:10.1016/j.apsusc.2014.07.020

Cited by 103 publications

(47 citation statements)

References 33 publications

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“…Thus, the electrons are not directly excited to the conduction band since these unoccupied sites can capture the photo-excited electrons. Similar observation had been seen by Tahir and Amin (2013) and Todorova et al (2014) for their prepared TiO 2 -clay composite.…”

Section: Resultssupporting

confidence: 88%

Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system

Ngoh

Nawi

2016

Int. J. Environ. Sci. Technol.

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An immobilized clay composite (BEN-PVAG) on a glass plate (GP) was fabricated using bentonite powder (BEN) and glutaraldehyde cross-linked polyvinyl alcohol (PVAG) as the adsorbent and adhesive, respectively. The immobilized bentonite composite (BEN-PVAG) was characterized using SEM, EDX, FTIR, and BET analysis. The adsorption capacity of BEN-PVAG was examined using methylene blue (MB) as the model pollutant. The results indicated that the adsorption of MB onto BEN-PVAG obeyed pseudo-second-order kinetics. In addition, the adsorption of MB by the immobilized BEN-PVAG was controlled by intra-particle diffusion. In contrast, the adsorption of MB by the suspended BEN-PVAG composite was dominated by film diffusion. The immobilized BEN-PVAG was then applied as the adsorbent sublayer for the fabrication of P-25TiO 2 /BEN-PVAG/GP bilayer system where P-25TiO 2 was deposited as the top layer. The fabricated bilayer system exhibited synergistic photocatalytic-adsorptive removal of MB upon irradiation with a light source, while experiment in the dark yielded only adsorption process. The rate of the synergistic photocatalytic-adsorptive removal of MB by the P-25TiO 2 / BEN-PVAG/GP was 5.3 times faster than the suspended P-25TiO 2 . The result implied the positive impact of the BEN-PVAG adsorbent sub-layer on the immobilized P-25TiO 2 photocatalyst. Most important, the immobilized P-25TiO 2 /BEN-PVAG/GP provided a convenient reuse of the catalyst over time where the treated water could be directly discharged without the need of filtration.

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Section: Resultssupporting

confidence: 88%

Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system

Ngoh

Nawi

2016

Int. J. Environ. Sci. Technol.

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“…Studies on single metal pillared clay (e.g., Al, Fe, and Ti) are well reported in previous literature [13][14][15][16], where researchers found that mixed metal polycations pillared clay had better adsorption properties or enhanced photoactivity. Liu et al [17] discovered that Ag/Ti co-pillared MMT had better photocatalytic performance than titanium pillared MMT.…”

Section: Introductionmentioning

confidence: 95%

Fe/Ti co-pillared clay for enhanced arsenite removal and photo oxidation under UV irradiation

Cai

Guo

et al. 2015

Applied Surface Science

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“…In addition, alkali compounds of mortar (portlandite) can contribute to NO 2 adsorption [57]. Using clay substrates made from minerals like talc and hydrotalcite can also enhance the De-NO x efficiency of photocatalysis [58]. Like mortar, these substrates have an alkali character: not only NO 2 adsorption is promoted but also NO is directly transformed to NO 3 − , that is, without generating NO 2 .…”

Section: Influence Of Tio 2 Dry Matter Content On Photocatalysismentioning

confidence: 99%

Investigation on Parameters Affecting the Effectiveness of Photocatalytic Functional Coatings to Degrade NO: TiO₂ Amount on Surface, Illumination, and Substrate Roughness

Hot

Topalov

Ringot

et al. 2017

International Journal of Photoenergy

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This paper deals with the degradation of NO by photocatalytic oxidation using TiO 2 -based coatings. Tests are conducted at a laboratory scale through an experimental setup inspired from ISO 22197-1 standard. Various parameters are explored to evaluate their influence on photocatalysis efficiency: TiO 2 dry matter content applied to the surface, nature of the substrate, and illumination conditions (UV and visible light). This article points out the different behaviors between three kinds of substrates which are common building materials: normalized mortar, denser mortar, and commercial wood. The illumination conditions are of great importance in the photocatalytic process with experiments under UV light showing the best results. However, a significant decrease in NO concentration under visible light is also observed provided that the TiO 2 dry matter content on the surface is high enough. The nature of the substrate plays an important role in the photocatalytic activity with rougher substrates being more efficient to degrade NO. However, limiting the roughness of the substrate seems to be of utmost interest to obtain the highest exposed surface area and thus the optimal photocatalytic efficiency. A higher roughness promotes the surface contact between TiO 2 and NO but does not necessarily increase the photochemical oxidation.

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Composite TiO2/clays materials for photocatalytic NOx oxidation

Cited by 103 publications

References 33 publications

Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system

Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system

Fe/Ti co-pillared clay for enhanced arsenite removal and photo oxidation under UV irradiation

Investigation on Parameters Affecting the Effectiveness of Photocatalytic Functional Coatings to Degrade NO: TiO₂ Amount on Surface, Illumination, and Substrate Roughness

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Composite TiO2/clays materials for photocatalytic NOx oxidation

Cited by 103 publications

References 33 publications

Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system

Role of bentonite adsorbent sub-layer in the photocatalytic-adsorptive removal of methylene blue by the immobilized TiO2/bentonite system

Fe/Ti co-pillared clay for enhanced arsenite removal and photo oxidation under UV irradiation

Investigation on Parameters Affecting the Effectiveness of Photocatalytic Functional Coatings to Degrade NO: TiO2 Amount on Surface, Illumination, and Substrate Roughness

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Product

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Investigation on Parameters Affecting the Effectiveness of Photocatalytic Functional Coatings to Degrade NO: TiO₂ Amount on Surface, Illumination, and Substrate Roughness