Zeolite–TiO 2 hybrid composites for pollutant degradation in gas phase

Jansson, Ingrid; Suárez, Silvia; García-García, Francisco J.; Cabrero, Benigno Sánchez

doi:10.1016/j.apcatb.2014.10.022

Cited by 121 publications

(60 citation statements)

References 36 publications

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“…According to the literature data, NTD/Y nanocomposites combine the properties of the initial components: photocatalytic (Domoroshchina et al 2017;Kuwahara et al 2012;Wang et al 2008Wang et al , 2015Kamegawa et al 2013;Jansson et al 2015;Maraschi et al 2014), adsorption (Domoroshchina et al 2017;Kravchenko et al 2016;Zendehdel et al 2014), and bactericidal (Domoroshchina et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Basic Violet 10 in suspension (Wang et al 2008), marbofloxacin and enrofloxacin in water (Maraschi et al 2014), Methyl Orange dye in water (Domoroshchina et al 2017;Wang et al 2015), formaldehyde and trichloroethylene in gas phase under UV (Jansson et al 2015) and the degradation of 2-propanol in water under visible light (Kamegawa et al 2013).…”

Section: Introductionmentioning

confidence: 99%

“…In NTD/Y synthesized by wet impregnation (Alwash et al 2013;Jansson et al 2015) or mechanical mixing techniques (Maraschi et al 2014), amorphous (Alwash et al 2013), and presumably, nano-anatase (Jansson 1 3 et al 2015) are present only on the surface of the zeolite (group I) [Energy-dispersive X-ray spectroscopy (EDS), X-ray powder diffraction]. The application of the sol-gel method results in the formation of samples containing amorphous NTD both on the surface and within the zeolite framework (groups I + II) [IR spectroscopy, X-ray powder diffraction, SEM, Brunauer-Emmett-Teller method (BET)] (Wang et al 2015).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Changing the characteristics and properties of zeolite Y and nano-anatase in the formation of a nano-anatase/Y composite with improved photocatalytic and adsorption properties

et al. 2018

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Zeolite Y and the NTD/Y nanocomposite, which were synthesized in situ (the addition of zeolite Y to the reaction mixture in the course of the synthesis of NTD by the sulfate method), were studied by a variety of methods. The decrease in the particle size (scanning electron microscopy) and the water content in pores (X-ray powder diffraction study, the full-profile Rietveld method, IR spectroscopy, differential scanning calorimetry), the increase in OH groups content and the decrease in the water content on the surface of zeolite (X-ray photoelectron spectroscopy) in the composition of NTD/Y compared to the initial zeolite Y were all established. A larger specific surface area of NTD/Y (Brunauer-Emmet-Teller method) compared to the initial zeolite Y is due to the fact that zeolite Y in the nanocomposite contains a smaller amount of water because of the synthesis conditions and the presence of nanocrystalline NTD on the surface of zeolite particles. It was found that NTD/Y nanocomposite exhibits a higher photocatalytic activity in the model decomposition reaction of methyl orange under UV and adsorption capacity for the extraction of P(V) and As(V) ions from aqueous media compared to the initial zeolite and pure NTD obtained under the same conditions, which differs from NTD/Y by the larger particle size, the smaller specific surface and the smaller content of OH groups and water on the surface. The role of Bronsted and Lewis centers in the realization of properties is discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changing the characteristics and properties of zeolite Y and nano-anatase in the formation of a nano-anatase/Y composite with improved photocatalytic and adsorption properties

et al. 2018

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“…Takeuchi et al [35] reported a high activity for the photooxidation of gaseous acetaldehyde using TiO 2 /ZSM-5 catalysts synthesized by a simple impregnation. Jansson et al [36] studied the photodegradation of formaldehyde and trichloroethylene over composites of TiO 2 and the zeolites Y and ZSM-5 with different n Si /n Al ratios prepared using incipient wetness impregnation of the zeolite with an acidic TiO 2 sol. Applying a composite of zeolite ZSM-5 loaded with as little as 8 wt.% of TiO 2 resulted in a significant increase of photodegradation of formaldehyde and trichloroethylene among the other composites and pure TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Oxidation of NO over Composites of Titanium Dioxide and Zeolite ZSM-5

2016

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Abstract:Composites of TiO 2 (Hombikat, P25, sol-gel synthesis) and zeolite ZSM-5 (n Si /n Al = 55) with mass fractions from 25/75 to 75/25 were prepared by mechanical mixing, solid-state dispersion and sol-gel synthesis. Characterization of the composites by X-ray diffraction (XRD), N 2 -sorption, scanning electron microscopy (SEM), and UV-Vis spectroscopy show that mechanical mixing and solid-state dispersion lead to comparable textural properties of the composites. A homogeneous distribution and intimate contact of small TiO 2 particles on the crystal surface of zeolite ZSM-5 were achieved by sol-gel synthesis. The composites were studied in the photocatalytic oxidation (PCO) of NO in a flatbed reactor under continuous flow according to ISO 22197-1. The highest NO conversion of 41% at an NO 2 selectivity as low as 19% stable for 24 h on-stream was reached over the TiO 2 /ZSM-5 composite from sol-gel synthesis with equal amounts of the two components after calcination at 523 K. The higher activity and stability for complete NO oxidation than for pure TiO 2 from sol-gel synthesis, Hombikat, or P25 is attributed to the adsorptive properties of the zeolite ZSM-5 in the composite catalyst. Increasing the calcination temperature up to 823 K leads to larger TiO 2 particles and a lower photocatalytic activity.

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“…[1][2][3] Adsorbent compounds incorporated in TiO 2 increase the photocatalytic activity by collecting pollutants onto the surface of the photocatalyst from the solution. Currently most of the studies are focused on the immobilization of TiO 2 on supports, including NiO, 4) polymers, 5) stainless steel, 6) reduced graphene oxide, 7) zeolites, 8) etc. Among the above materials, zeolites are considered to be important TiO 2 supports, owing to their large surface area, high thermal stability and eco-friendly nature.…”

Section: Introductionmentioning

confidence: 99%

Hydrochloric Acid Treatment: An Effective Method to Enhance the Catalytic Performance of TiO<sub>2</sub> Stellerite Composite Photocatalyst on Methyl Orange

et al. 2016

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Stellerite (a natural zeolite) was used as substrate for titanium dioxide deposition. Stellerite was treated at 363 K with hydrochloric acid solutions of different concentrations (0.2-1.0 mol L −1 ) for 4 hours. The resulting composite samples were characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FT-IR), BET surface area analysis and X-ray diffraction (XRD). The hydrochloric acid treatment caused the creation of micropores with 1 nm diameter. The result illustrates that stellerite possesses strongly acid-resistant property in hydrochloric acid solutions with a concentration no higher than 0.4 mol L . The recycling of the TiO 2 /stellerite photocatalyst was also investigated, and the methyl orange degradation rate was 75.0% of the initial rate after four cycles.

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Zeolite–TiO 2 hybrid composites for pollutant degradation in gas phase

Cited by 121 publications

References 36 publications

Changing the characteristics and properties of zeolite Y and nano-anatase in the formation of a nano-anatase/Y composite with improved photocatalytic and adsorption properties

Changing the characteristics and properties of zeolite Y and nano-anatase in the formation of a nano-anatase/Y composite with improved photocatalytic and adsorption properties

Photocatalytic Oxidation of NO over Composites of Titanium Dioxide and Zeolite ZSM-5

Hydrochloric Acid Treatment: An Effective Method to Enhance the Catalytic Performance of TiO<sub>2</sub> Stellerite Composite Photocatalyst on Methyl Orange

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