Degussa P25 TiO 2 modified with H 2 O 2 under microwave treatment to enhance photocatalytic properties

Han, EunJi; Vijayarangamuthu, K.; Youn, Jong-Chan; Park, Young-Kwon; Jung, Sang‐Chul; Jeon, Ki‐Joon

doi:10.1016/j.cattod.2017.08.057

Cited by 78 publications

(44 citation statements)

References 42 publications

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“…Heterogeneous photocatalysis using titanium dioxide (TiO 2 ) has been widely investigated as an attractive advanced oxidation process for the physicochemical treatment of a variety of pollutants in water ( Malato et al, 2003 ; Hashimoto, Irie & Fujishima, 2005 ; Pelaez et al, 2012 ; Chen et al, 2015 ; Han et al, 2017 ; Manassero, Satuf & Alfano, 2017 ; Nur et al, 2017 ; Srikanth et al, 2017 ). TiO 2 is one of the most used catalysts in photocatalytic degradation of organic pollutants due to properties such as absence of toxicity, very low solubility, high chemical and photostability and low cost ( Machado et al, 2012 ; Wang et al, 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Immobilized TiO₂ on glass spheres applied to heterogeneous photocatalysis: photoactivity, leaching and regeneration process

Cunha

Kuznetsov

Achete

et al. 2018

PeerJ

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Heterogeneous photocatalysis using titanium dioxide as catalyst is an attractive advanced oxidation process due to its high chemical stability, good performance and low cost. When immobilized in a supporting material, additional benefits are achieved in the treatment. The purpose of this study was to develop a simple protocol for impregnation of TiO2-P25 on borosilicate glass spheres and evaluate its efficiency in the photocatalytic degradation using an oxidizable substrate (methylene blue), in a Compound Parabolic Concentrator (CPC) reactor. The assays were conducted at lab-scale using radiation, which simulated the solar spectrum. TiO2 leaching from the glass and the catalyst regeneration were both demonstrated. A very low leaching ratio (0.03%) was observed after 24 h of treatment, suggesting that deposition of TiO2 resulted in good adhesion and stability of the photocatalyst on the surface of borosilicate. This deposition was successfully achieved after calcination of the photocatalyst at 400 °C (TiO2-400 °C). The TiO2 film was immobilized on glass spheres and the powder was characterized by scanning electron microscopy (SEM), X-ray diffraction and BET. This characterization suggested that thermal treatment did not introduce substantial changes in the measured microstructural characteristics of the photocatalyst. The immobilized photocatalyst degraded more than 96% of the MB in up to 90 min of reaction. The photocatalytic activity decreased after four photocatalytic cycles, but it was recovered by the removal of contaminants adsorbed on the active sites after washing in water under UV-Vis irradiation. Based on these results, the TiO2-400 °C coated on glass spheres is potentially a very attractive option for removal of persistent contaminants present in the environment.

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Section: Introductionmentioning

confidence: 99%

Immobilized TiO₂ on glass spheres applied to heterogeneous photocatalysis: photoactivity, leaching and regeneration process

Cunha

Kuznetsov

Achete

et al. 2018

PeerJ

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“…Many techniques, such as chemical, electrochemical, physical, photoelectrochemical, and photocatalytic methods, can be used to deal with such types of compounds. The current approach is to use an advanced oxidation process in which a photocatalyst is used along with a green oxidizing agent such as ozone or hydrogen peroxide [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Toward an Accurate Spectrophotometric Evaluation of the Efficiencies of Photocatalysts in Processes Involving Their Separation Using Nylon Membranes

et al. 2018

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Many works include the use of nylon membranes to separate the solid particles of photocatalysts from the photocatalytic reactors, before using spectrophotometers to evaluate the catalysts' performance in the photocatalytic degradation of many pollutants. This might lead to significant errors due to the adsorption of some pollutants within the structure of the membranes during the filtration process used to separate the solid particles of the photocatalysts to get a clear filtrate. This, consequently, leads to incorrect calculations, which in turn are translated into false high photocatalytic efficiencies of the used catalysts. In this work, the authors study the interaction between nylon membrane filters and five different model compounds-phenol red, methylene blue, rhodamine B, rhodamine 6G, and phenol. The study reveals a significant interaction between the nylon membranes and both rhodamine B and phenol red.During the investigation of the fluorescence signal in the photodegradation of polymers and pollutant degradation, we serendipitously discovered that a simple model compound, such as phenol red and rhodamine B, is removed efficiently through filtration using the commonly used Whatman nylon filter membranes purchased from Sigma Aldrich. This type of filter membrane, with a 0.2 µm pore size, 47 mm diameter, and 0.5 mm thickness, is proposed to be used after the photodegradation process to remove the submicron photocatalysts and obtain the filtrate for spectrophotometric analysis. This observation made us curious and, thus, we decided to investigate more in depth the removal efficiency of these nylon membranes and the removal mechanism beyond this observation. We chose several probes with different chemical characteristics, such as rhodamine B, phenol, rhodamine 6G, phenol red, and methylene blue. Our results indicate that the nature of the chemical structure is responsible for the removal through a chemical mechanism, involving a negatively charged molecule interacting with a positive charge from the terminal part of a polymer backbone in polyamide-based filters.

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“…Figure 1b shows the Raman spectrum of the original TiO 2 and Ar-TiO 2 in Ar atmosphere. The original sample peaks were: 146 cm −1 (E g ), 196 cm −1 (E g ), 399 cm −1 (B 1g ), 514 cm −1 (A 1g or B 1g ) and 640 cm −1 (A 1g ) respectively typical Anatase phase [52,53,54]. The treated sample showed a scattering peak only at 146 cm −1 (E g ).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocatalytic Degradation of Organic Dyes via Defect-Rich TiO2 Prepared by Dielectric Barrier Discharge Plasma

Wang

et al. 2019

Nanomaterials

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The dye wastewater produced in the printing and dyeing industry causes serious harm to the natural environment. TiO2 usually shows photocatalytic degradation of dye under the irradiation ultravilet light rather than visible light. In this work, a large number of oxygen vacancies and Ti3+ defects were generated on the surface of the TiO2 nanoparticles via Ar plasma. Compared with pristine TiO2 nanoparticles, the as-obtained Ar plasma-treated TiO2 (Ar-TiO2) nanoparticles make the energy band gap reduce from 3.21 eV to 3.17 eV and exhibit enhanced photocatalytic degradation of organic dyes. The Ar-TiO2 obtained exhibited excellent degradation properties of methyl orange (MO); the degradation rate under sunlight irradiation was 99.6% in 30 min, and the photocatalytic performance was about twice that of the original TiO2 nanoparticles (49%). The degradation rate under visible light (λ > 400 nm) irradiation was 89% in 150 min, and the photocatalytic performance of the Ar-TiO2 was approaching ~4 times higher than that of the original TiO2 nanoparticles (23%). Ar-TiO2 also showed good degradation performance in degrading rhodamine B (Rho B) and methylene blue (MB). We believe that this plasma strategy provides a new method for improving the photocatalytic activity of other metal oxides.

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Degussa P25 TiO 2 modified with H 2 O 2 under microwave treatment to enhance photocatalytic properties

Cited by 78 publications

References 42 publications

Immobilized TiO₂ on glass spheres applied to heterogeneous photocatalysis: photoactivity, leaching and regeneration process

Immobilized TiO₂ on glass spheres applied to heterogeneous photocatalysis: photoactivity, leaching and regeneration process

Toward an Accurate Spectrophotometric Evaluation of the Efficiencies of Photocatalysts in Processes Involving Their Separation Using Nylon Membranes

Enhanced Photocatalytic Degradation of Organic Dyes via Defect-Rich TiO2 Prepared by Dielectric Barrier Discharge Plasma

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Degussa P25 TiO 2 modified with H 2 O 2 under microwave treatment to enhance photocatalytic properties

Cited by 78 publications

References 42 publications

Immobilized TiO2 on glass spheres applied to heterogeneous photocatalysis: photoactivity, leaching and regeneration process

Immobilized TiO2 on glass spheres applied to heterogeneous photocatalysis: photoactivity, leaching and regeneration process

Toward an Accurate Spectrophotometric Evaluation of the Efficiencies of Photocatalysts in Processes Involving Their Separation Using Nylon Membranes

Enhanced Photocatalytic Degradation of Organic Dyes via Defect-Rich TiO2 Prepared by Dielectric Barrier Discharge Plasma

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Product

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Immobilized TiO₂ on glass spheres applied to heterogeneous photocatalysis: photoactivity, leaching and regeneration process

Immobilized TiO₂ on glass spheres applied to heterogeneous photocatalysis: photoactivity, leaching and regeneration process