TiO<sub>2</sub> Thin Film with Varied Porous Structure Applied on the Degradation of Methylene Blue

Wang, Sheng-Hung; Wang, Kuo-Hua; Jehng, Jih‐Mirn

doi:10.1002/jccs.201300290

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…3 showed the photocurrent increased linearly at low potential and then saturated at higher potential. Photocurrent generated would be increased by the increasing concentration of organic compounds, it showed the increasing rate of photohole capturing, i.e the reacting hole with organic compounds on the surface of TiO 2 film 18 . With the increasing rate of capturing photohole the charge recombination processes on the surface of TiO 2 was reduced and the photocurrent value would increase.…”

Section: Measurement Of Contact Angle (Hydrophilic Test Of Tio 2 -Pegmentioning

confidence: 99%

Preparation of TiO2-PEG Thin Film on Hydrophilicity Performance and Photocurrent Response

Ritonga¹,

Faiqoh²,

Wibowo³

et al. 2015

Biosci., Biotech. Res. Asia

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TiO 2 photocatalytic process has been developed and used in various applications. One of the use of TiO 2 is related to the hydrophilic properties, which is shown with a small contact angle between the surface of object and liquid (<10°). In this study, TiO 2 was coated on a glass surface with the dip coating method. TiO 2 catalyst was prepared by titanium tetraisopropoxide (TTIP) as precursor and polyethylene glycol (PEG) as template calcined at a temperature of 450°C. The addition of PEG was varied to obtain optimal conditions. Measurement of Diffuse Reflectance Spectroscopy UV-Vis (DRS UV-Vis) showed a decrease in the value of the band gap for TiO 2 , TiO 2 -PEG 200, TiO 2 -PEG 400 and TiO 2 -PEG 1000 were 3.153 eV; 3.056 eV; 3.012 eV and 2.975 eV, respectively. Results of contact angle measurements have been achieved hydrophilic properties. While, the photocurrent response of the three TiO 2 working electrodes added the PEG 200, PEG 400, PEG 1000 were 2.3×10 -3 A, 2.2×10 -3 A and 4.2×10 -3 A, respectively. Therefore, PEG could improve the performance of TiO 2 catalysts.

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Section: Measurement Of Contact Angle (Hydrophilic Test Of Tio 2 -Pegmentioning

confidence: 99%

Preparation of TiO2-PEG Thin Film on Hydrophilicity Performance and Photocurrent Response

Ritonga¹,

Faiqoh²,

Wibowo³

et al. 2015

Biosci., Biotech. Res. Asia

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show abstract

“…Then, the pollutants will be transformed into less harmful inorganic compounds, namely carbon dioxide and water. [1,2] One of the semiconductors that is usually used as a photocatalyst is titanium dioxide. [3] Less toxicity, low cost, and chemical and thermal stability make TiO 2 preferable to industrial usage especially for wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Insight into the influence of defect sites in mixed phase of mesoporous titania nanoparticles toward photocatalytic degradation of 2‐chlorophenol: Effect of light source

Marfur

Jaafar

2021

J Chinese Chemical Soc

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The impact of different light irradiation was studied on photocatalytic degradation of 2‐chlorophenol (2‐CP) using mesoporous titania nanoparticles (MTNs) prepared by microwave‐assisted methods. The photoactivity of MTNs was also compared with pretreated commercial TiO2 and Degussa P25 (P25). The reactions were conducted for 2.5 hr under UV‐A, UV‐C, sunlight, and visible light using a batch reactor. The catalysts were characterized by X‐ray powder diffractometer, UV–Vis diffuse reflectance spectroscopy, photoluminescence, Brunauer–Emmett–Teller method, field‐emission scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy. The characterization results confirmed that MTN consisted a composition of 21% rutile phase and 79% anatase phase with Ti3+ site defects (TSDs) and oxygen vacancies (OVs) in their structures because of their anionic surfactant nature, microwave heating, and high calcination temperature during the catalyst preparation. Besides, the photoactivity of MTN upon degradation of 2‐CP under sunlight has exhibited the best performance with 100% degradation followed by UV‐A, visible light, and UV‐C with degradation of 96, 52, and 39%, respectively. MTNs showed a remarkable performance due to their mixed‐phase crystalline structures as well as the formation of TSDs and OVs, which improved the charge migration, lowered the band gap energy, and reduced the rate of electron–hole recombination, thus succeeded to be activated under a wide range of light responses.

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Pure and cerium‐doped zinc oxides: Hydrothermal synthesis and photocatalytic degradation of methylene blue under visible light irradiation

Đại

Lim

et al. 2020

J Chinese Chemical Soc

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Pristine and cerium-doped zinc oxides with a different dopant concentration between 1 and 5% were fabricated using the hydrothermal method. Prepared materials show direct bandgaps of comparable values. Cerium-doped materials show UV-Vis spectra with broad tails toward the visible light range. Pure zinc oxide displays the flower-like form, while cerium-doped materials possess rod-shaped morphologies. The materials were tested for the degradation performance of methylene blue under visible light irradiation. To elucidate the difference in their performance, further measurements and experiments were conducted. Overall, 3%-cerium doped zinc oxide shows the greatest photocatalytic performance. This is possibly attributed to its rod shape with good uniformity and to the enrichment of oxygen vacancies in its surface layers. Finally, trapping experiments reveal that positive holes and hydroxyl radicals were the predominant active species during the photocatalytic degradation process.

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TiO₂ Thin Film with Varied Porous Structure Applied on the Degradation of Methylene Blue

Cited by 3 publications

References 29 publications

Preparation of TiO2-PEG Thin Film on Hydrophilicity Performance and Photocurrent Response

Preparation of TiO2-PEG Thin Film on Hydrophilicity Performance and Photocurrent Response

Insight into the influence of defect sites in mixed phase of mesoporous titania nanoparticles toward photocatalytic degradation of 2‐chlorophenol: Effect of light source

Pure and cerium‐doped zinc oxides: Hydrothermal synthesis and photocatalytic degradation of methylene blue under visible light irradiation

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TiO2 Thin Film with Varied Porous Structure Applied on the Degradation of Methylene Blue

Cited by 3 publications

References 29 publications

Preparation of TiO2-PEG Thin Film on Hydrophilicity Performance and Photocurrent Response

Preparation of TiO2-PEG Thin Film on Hydrophilicity Performance and Photocurrent Response

Insight into the influence of defect sites in mixed phase of mesoporous titania nanoparticles toward photocatalytic degradation of 2‐chlorophenol: Effect of light source

Pure and cerium‐doped zinc oxides: Hydrothermal synthesis and photocatalytic degradation of methylene blue under visible light irradiation

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TiO₂ Thin Film with Varied Porous Structure Applied on the Degradation of Methylene Blue