Investigation of a TiO 2 photocatalyst immobilized with poly(vinyl alcohol)

Hegedűs, Péter; Szabó-Bárdos, Erzsébet; Horváth, Ottó; Szabó, Péter; Horváth, Krisztián

doi:10.1016/j.cattod.2016.11.050

Cited by 41 publications

(26 citation statements)

References 22 publications

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“…Titania is a highly effective photoactive material, with great promise in the fields of photocatalysts, solar cells, etc. [1][2][3][4][5] For many applications it can be a great advantage to use TiO 2 in coating form: e.g. in air-and water purification via photocatalytic means, coatings offer easier separation of the photocatalyst from the polluted fluid and a more manageable system compared 82 to other forms (i.e.…”

Section: Introductionmentioning

confidence: 99%

Thin layer photocatalysts of TiO2-Ag composites

Tegze¹,

Albert²,

Dikó³

et al. 2019

Studia UBB Chemia

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BORBÁLA TEGZE a , EMŐKE ALBERT a , BOGLÁRKA DIKÓ a , JÁNOS MADARÁSZ b , GYÖRGY SÁFRÁN c , ZOLTÁN HÓRVÖLGYI a, * ABSTRACT. Mesoporous TiO2 coatings were prepared by sol-gel dipcoating method on glass and SiO2 coated glass substrates. They were modified with silver by two different methods: impregnation of as-prepared coatings in AgNO3 aqueous solution; coating deposition from precursor sols containing AgNO3. Transmittance spectra, refractive index, layer thickness and porosity were determined by UV-Vis spectroscopy. Crystallinity of the samples was characterized by XRD, and the morphology and structure by HR-TEM. Photoinduced wettability conversion of the samples was studied, and it was found that the presence of the SiO2 barrier layer and the silver content had significant effect on the wetting behaviour. The photoactivity and reusability of the samples were investigated with methyl orange dye degradation under ultraviolet (UV) irradiation. TiO2 coatings impregnated in 1M AgNO3 solution were found to be the most stable photocatalyst system.

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Section: Introductionmentioning

confidence: 99%

Thin layer photocatalysts of TiO2-Ag composites

Tegze¹,

Albert²,

Dikó³

et al. 2019

Studia UBB Chemia

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“…22 Nevertheless, there existed few reports with respect to employing pure TiO 2 NPs in industrial effluents purification owing to the challenge of recovery of powdered TiO 2 NPs after wastewater treatment. 23,24 To immobilize TiO 2 NPs in various substrates is an effective approach to avoid the problem. 25 PVA, as a semi-crystalline hydrophilic polymer with good chemical and thermal stability, is a highly biocompatible, hydrophilic, non-toxic, low cost and easily processed polymer.…”

Section: Encapsulating Tio 2 Into Polyvinyl Alcohol Coated Polyacrylomentioning

confidence: 99%

Encapsulating TiO2 into Polyvinyl Alcohol Coated Polyacrylonitrile Composite Beads for the Effective Removal of Methylene Blue

Han

Jin

Wang

et al. 2018

J. Braz. Chem. Soc.

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In this work, novel nanocomposite beads based on polyvinyl alcohol (PVA) coated polyacrylonitrile (PAN) with encapsulation of TiO 2 nanoparticles (PPT) were developed successfully via a novel green synthetic method and its methylene blue (MB) removal ability by adsorption was also investigated. As-prepared nanocomposite beads were characterized by different techniques such as Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). TiO 2 nanoparticles were encapsulated into the composite beads to endow the composite beads with photocatalytic ability and enhance its adsorption capacity for MB. Batch experiments with several variables such as TiO 2 nanoparticle content, pH of the solution, contact time and initial MB concentration were carried out. The adsorption kinetic study revealed that the MB adsorption process agreed well with pseudo-second order model and showed 3-stage intraparticle diffusion model. The adsorption isotherm study indicated that the MB adsorption process could also be better described by Langmuir isotherm model. According to Langmuir isotherm equation, the maximum adsorption capacity and removal rate for MB was 242.13 mg g-1 and 98.4%, respectively. Moreover, the stability and reusability of as-prepared PPT beads were further explored and results demonstrated that PPT could be reused at least five times with negligible loss of sorption capacity and removal rate. Therefore, PPT is expected to be a potential candidate for effluents treatment.

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“…The reduction of a specific surface area would have a negative impact on the ability to remove contaminants. Another essential aspect of the immobilization process is the final crystalline structure of the photocatalyst on a carrier [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Successful Immobilization of Lanthanides Doped TiO2 on Inert Foam for Repeatable Hydrogen Generation from Aqueous Ammonia

et al. 2020

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We describe the successful possibility of the immobilization of a photocatalyst on foam, which is beneficial from a practical point of view. An immobilized photocatalyst is possible for use in a continuous experiment and can be easily separated from the reactor after the reaction concludes. Parent TiO2, La/TiO2, and Nd/TiO2 photocatalysts (containing 0.1 wt.% of lanthanide) were prepared by the sol-gel method and immobilized on Al2O3/SiO2 foam (VUKOPOR A) by the dip-coating method. The photocatalysts were investigated for the photocatalytic hydrogen generation from an aqueous ammonia solution under UVA light (365 nm). The evolution of hydrogen was compared with photolysis, which was limited to zero. The higher hydrogen generation was observed in the presence of 0.1 wt.% La/TiO2 than in 0.1 wt.% Nd/TiO2. This is, besides other things, related to the higher level of the conduction band, which was observed for 0.1 wt.% La/TiO2. The higher conduction band’s position is more effective for hydrogen production from ammonia decomposition.

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Investigation of a TiO 2 photocatalyst immobilized with poly(vinyl alcohol)

Cited by 41 publications

References 22 publications

Thin layer photocatalysts of TiO2-Ag composites

Thin layer photocatalysts of TiO2-Ag composites

Encapsulating TiO2 into Polyvinyl Alcohol Coated Polyacrylonitrile Composite Beads for the Effective Removal of Methylene Blue

Successful Immobilization of Lanthanides Doped TiO2 on Inert Foam for Repeatable Hydrogen Generation from Aqueous Ammonia

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