Modification of titanium dioxide by solution plasma

Tran, Minh-Hai; Jeong, Hae Kyung

doi:10.1016/j.jpcs.2018.05.047

Cited by 11 publications

(5 citation statements)

References 24 publications

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Section: Resultsmentioning

confidence: 99%

“…TiO 2 particles that embedded in p(AMPS) hydrogel and used as photocatalyst in MB degradation are in anatase form, and the band gap for TiO 2 in this form is 3.2 eV. [8] It has been stated by most sources in the literature that anatase is more photoactive than rutile. [46] Electron and hole are generated in the conduction band and valence band of TiO 2 by UV light (hν) as shown in the reactions below (Equations ( 4)-( 8)), respectively.…”

Section: The Mechanism Of Mb Degradationmentioning

confidence: 99%

“…Upon exposure to UV light, TiO 2 is activated and initiates many oxidation and reduction reactions in different environments. [ 8 ] Also, TiO 2 is stable in many different chemical environments. [ 9 ] Therefore, TiO 2 can be used as a photocatalyst for different organic reactions; for example, the degradation of toxic chemicals.…”

Section: Introductionmentioning

confidence: 99%

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The use of titanium dioxide particles embedded in anionic hydrogel composite for photocatalytic degradation of methylene blue

2021

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Poly(2-acrylamido-2-methyl-1-propane sulfonic acid) (p(AMPS)) anionic hydrogels with 1, 5 and 10 wt% TiO 2 particles were prepared by a simultaneous free radical polymerization and crosslinking reaction. The hydrogel composites were tested as photo-catalysts for the degradation of methylene blue (MB) in water. Since MB dye is positively charged, MB should be readily absorbed by the anionic p(AMPS) hydrogel and then degraded by the entrapped TiO 2 nanoparticle photocatalysts within the p(AMPS) matrix. Photocatalytic degradation of MB was promoted using a UV lamp (300 W) to activate TiO 2 particles and was monitored by UV-Vis spectrometer. Interestingly, the activation energy of 20.58 kJ.mol −1 was found to be one of the lowest reported in the literature.The reusability and regeneration efficiency studies of the composite catalyst showed that the p(AMPS)-TiO 2 composite catalyst possessed 90% activity even after five repetitive use and maintained above 85% activity even after the second regeneration. Using different organic scavengers such as ascorbic acid, dimethylsulfoxide and methanol, it was determined that the main reactive species in the photodegradation of MB dye are electrons and superoxide ions. p(AMPS)-TiO 2 composite hydrogel has potential to be used as a good photocatalyst in degradation of toxic dyes and some organic pollutants.

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Section: Resultsmentioning

confidence: 99%

Section: The Mechanism Of Mb Degradationmentioning

confidence: 99%

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The use of titanium dioxide particles embedded in anionic hydrogel composite for photocatalytic degradation of methylene blue

2021

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“…Discharges in liquids are an effective method for creating defects in nanoobjects. Tran et al [157] used highvoltage discharges in a DBD configuration to gel a sol made of water, titanium tetraisopropoxide and HNO3. Argon was bubbled into the liquid, and the synthesized mixtures of defective anatase and rutile crystals were calcinated before use.…”

Section: Engineering Of Defects By Post-processingmentioning

confidence: 99%

Submerged Discharges in Liquids for Nanoobject Synthesis: Expectations and Capabilities

Belmonte

Noël

Gries

et al. 2023

Plasma Chem Plasma Process

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Electrical discharges in liquids are used to synthesize and process nanoobjects with breakthrough achievements that lead to high expectations in the field. As plasmas are non-equilibrium media, the possibility to access novel compositions, shapes, structures, etc. is often put forward as major argument to promote these processes. Two main classes of processes are considered in this review: the so-called "solution plasma" and glow-discharge electrolysis. The influence of the main parameters controlling the selected processes is discussed. Applications are also presented together with expectations on breakthrough achievements awaited for these processes. Solution characteristics Electrical conductivityElectrical conductivity is generally the key factor that determines the applied voltage required for breakdown and discharge ignition. The lower the conductivity, the higher the voltage needed to achieve reproducible discharges, and the shorter the pulse width.

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“…Titanium dioxide has three common crystalline forms: anatase, brookite, and rutile. The anatasetitanium TiO 2 shows the best photocatalytic performance among the three crystalline types [7]. Meanwhile, anatase/brookite biphase TiO 2 can further enhance the photocatalytic perforence by the heterojunction [8].…”

Section: Introductionmentioning

confidence: 99%

Tridoped TiO2 Composite Films for Improved Photocatalytic Activities

Zhao

Han

et al. 2019

Coatings

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The Fe/B/F tridoped TiO2-ZnO composite films attached to glass substrates were prepared via a simple sol–gel method. We appraised all samples’ photocatalytic activities by the degradation of methyl green and formaldehyde solutions. The samples were characterized by photoluminescence (PL) spectra, UV-Vis diffraction reflectance absorption spectra (DRS), X-ray diffraction (XRD), differential thermal analysis-thermogravimetry (DTA-TG), field emission scanning electron microscopy (FE-SEM) equipped with energy-dispersive spectroscopy (EDS), and Brunner–Emmet–Teller (BET) measurements. According to the results of DRS and PL spectroscopy, the multi-modification could not only enhance visible light absorption intensity, but also decrease the recombination rate of photo-generated electron-hole pairs. XRD results revealed that the sample was mainly in anatase crystal type. FE-SEM results shown that the sample had fewer particle aggregates and almost no cracks. The specific surface area of the Fe/B/F tridoped TiO2-ZnO was 104.9 m2·g−1, while that of the pure TiO2 was 84.0 m2·g−1. Compared to pure TiO2 and TiO2-ZnO, the Fe/B/F tridoped TiO2-ZnO composite film had the highest photocatalytic activity due to their synergies.

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Modification of titanium dioxide by solution plasma

Cited by 11 publications

References 24 publications

The use of titanium dioxide particles embedded in anionic hydrogel composite for photocatalytic degradation of methylene blue

The use of titanium dioxide particles embedded in anionic hydrogel composite for photocatalytic degradation of methylene blue

Submerged Discharges in Liquids for Nanoobject Synthesis: Expectations and Capabilities

Tridoped TiO2 Composite Films for Improved Photocatalytic Activities

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