The effect mechanisms of pH, complexant and calcination temperature on the hydrophilicity of TiO2 films prepared by the sol-gel method

Sun, Rongji; Chen, Zhili; Peng, Jingtang; Zheng, Taojie

doi:10.1016/j.apsusc.2018.08.163

Cited by 34 publications

(2 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some recent works have reported on heat treatment of titanium oxides [10][11][12][13][14]. As the treatment temperatures in their work were up to 500°C, which is much lower than that in our present work, royalsocietypublishing.org/journal/rsos R. Soc.…”

Section: Introductioncontrasting

confidence: 62%

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

et al. 2020

View full text Add to dashboard Cite

Nano-size EVONIK AEROXIDE ® P25 titanium dioxide, TiO 2 , powder was heat-treated at temperatures, 700–900°C, in air. An X-ray diffraction study showed that the P25 powder is composed of approximately 20 and approximately 80 mass% of rutile and anatase phases, respectively. It was also shown that the transformation from anatase to rutile induced by high-temperature heat treatment was almost completed at 750°C, whereas a small amount (less than 3 mass%) of anatase phase was still left even in the powder heat-treated at 900°C. The transformation behaviour was consistent with results obtained by Raman scattering spectroscopy. Raman experiments also indicated that high-temperature heating induced the formation of oxide ion vacancies. Powders were dispersed in methyl orange (MO) aqueous solution, and the bleach rate of MO was measured to evaluate photocatalytic activity under ultraviolet (UV)- and visible-light irradiation. After the heat treatment, the UV-light photocatalytic performance sharply deteriorated. Interestingly, visible-light photocatalytic activity was enhanced by high-temperature heating and reached the highest performance for an 800°C-heated sample, indicating that the P25 powder obtained high visible-light photocatalytic performance after heat treatment. Even after 900°C heat treatment, the photocatalytic performance was higher than that of as-received powder. Enhancement of photocatalytic activities was discussed in relation to visible light absorption and charge carrier transfer.

show abstract

Section: Introductioncontrasting

confidence: 62%

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In previous studies, it has been pointed out that the hydrophilicity of TiO 2 is closely related to the surface hydroxyl groups. 10,33,34,40,41 Figure 7c shows O 1s spectra of Fe/Ti-0 and Fe/Ti-1.0% after storing in the dark for 60 days. The binding energy at around 529.5 eV is attributed to the lattice oxygen.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Superhydrophilic Fe³⁺ Doped TiO₂ Films with Long-Lasting Antifogging Performance

Yang

Sun

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Based on the superhydrophilicity of titanium dioxide (TiO 2 ) after ultraviolet irradiation, it has a high potential in the application of antifogging. However, a durable superhydrophilic state and a broader photoresponse range are necessary. Considering the enhancement of the photoresponse of TiO 2 , doping is an effective method to prolong the superhydrophilic state. In this paper, a Fe 3+ doped TiO 2 film with long-lasting superhydrophilicity and antifogging is prepared by sol−gel method. The experiment and density-functional theory (DFT) calculations are performed to investigate the antifogging performance and the underlying microscopic mechanism of Fe 3+ doped TiO 2 . Antifogging tests demonstrate that 1.0 mol % Fe 3+ doping leads to durable antifogging performance which lasts 60 days. The DFT calculations reveal that the Fe 3+ doping can both increase the photolysis ability of TiO 2 under sunlight exposure and enhance the stability of the hydroxyl adsorbate on TiO 2 surface, which are the main reasons for a longlasting superhydrophilicity of TiO 2 after sunlight exposure.

show abstract

Efficient Synthesis of Dimethyl Carbonate via Transesterification from Ethylene Carbonate with Methanol Using KAlO₂/γ‐Al₂O₃ Heterogeneous Catalyst

Wei

Zhang

et al. 2020

ChemistrySelect

View full text Add to dashboard Cite

Dimethyl carbonate (DMC) is an important environmentally‐friendly organic compound. The need for efficient synthesis of DMC has given a fillip to search for new catalysts and their cost‐effective preparation. In this work, a series of KAlO2/γ‐Al2O3 heterogeneous catalysts were rapidly prepared by impregnation method. These catalysts were characterized by FTIR, XRD, XPS, TG‐MS, ICP‐OES, BET and Hammett acid‐base titration and tested for the synthesis of DMC via transesterification from ethylene carbonate (EC) with methanol. The results demonstrated that KAlO2, as the active species, was produced in large quantities during the calcination process. The catalyst with a calcination temperature of 700 °C and a K2CO3 loading of 45 wt % exhibited the best catalytic activity. The optimum conditions for the process resulted in a catalyst amount of 1.0 wt %, a reaction temperature of 100 °C and a reaction time of 80 min, in which the EC conversion and DMC selectivity were 80.2 % and 98.9 %, respectively. In addition, the TON, TOF and reaction rate were 80.3, 61.2 h−1 and 3.91 gDMC⋅gcat−1⋅min−1. The reusability of the catalyst with best catalytic activity was also studied.

show abstract

The effect mechanisms of pH, complexant and calcination temperature on the hydrophilicity of TiO2 films prepared by the sol-gel method

Cited by 34 publications

References 31 publications

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

Superhydrophilic Fe³⁺ Doped TiO₂ Films with Long-Lasting Antifogging Performance

Efficient Synthesis of Dimethyl Carbonate via Transesterification from Ethylene Carbonate with Methanol Using KAlO₂/γ‐Al₂O₃ Heterogeneous Catalyst

Contact Info

Product

Resources

About

The effect mechanisms of pH, complexant and calcination temperature on the hydrophilicity of TiO2 films prepared by the sol-gel method

Cited by 34 publications

References 31 publications

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

Superhydrophilic Fe3+ Doped TiO2 Films with Long-Lasting Antifogging Performance

Efficient Synthesis of Dimethyl Carbonate via Transesterification from Ethylene Carbonate with Methanol Using KAlO2/γ‐Al2O3 Heterogeneous Catalyst

Contact Info

Product

Resources

About

Superhydrophilic Fe³⁺ Doped TiO₂ Films with Long-Lasting Antifogging Performance

Efficient Synthesis of Dimethyl Carbonate via Transesterification from Ethylene Carbonate with Methanol Using KAlO₂/γ‐Al₂O₃ Heterogeneous Catalyst