Degradation of the ammonia wastewater in aqueous medium with ozone in combination with mesoporous TiO2 catalytic

Liu, Zhiwu; Qiu, Jianping; Zheng, Chaocan; Li, Liqing

doi:10.1063/1.4977261

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…7 There are some research reports conrming that NH 3 -N can be removed efficiently by TiO 2 photocatalysts from aqueous solutions. 4,13 TiO 2 has three main crystalline phases: anatase, rutile, and brookite. Among these, anatase TiO 2 shows the most prominent photocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic performance of biochar-modified TiO₂(C/TiO₂) for ammonia–nitrogen removal

Wang

Tian

et al. 2023

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic performance of biochar-modified TiO₂(C/TiO₂) for ammonia–nitrogen removal

Wang

Tian

et al. 2023

RSC Adv.

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Fluorine-regulated surface chemical state of titanium dioxide (TiO

et al. 2021

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Environmental contextAs a new type of photocatalytic material, nano-titanium dioxide can be applied in the field of energy and environmental protection. This research uses ammonium bifluoride to modify the titanium dioxide and analyses it in combination with interface chemistry theory, and finds that its photocatalytic efficiency has been greatly improved. This provides new ideas for wastewater treatment and pollutant degradation. AbstractTitanium dioxide (TiO2) was prepared by hydrothermally adjusting titanium sulfate with ammonium hydrogen fluoride. The UV-visible absorption spectra show that there was no significant redshift in the absorption sideband of the sample, but the addition of ammonium hydrogen fluoride affected the morphology and microstructure of the sample. When the molar ratio of F to Ti was 1.5, the specific surface area of TiO2 more than doubled, the surface complexation mode changed significantly and the number of surface-active sites increased by a factor of 16.24. The photocatalytic degradation measurements show that the decolourisation rate of the photocatalyst prepared by fluorine control was increased by 40% compared with the uncontrolled sample. The analysis of the combined state of the catalyst surface shows that the photocatalytic degradation efficiency and the amount of deprotonated TiO− as well as the number of positively charged oxidation states of methylene blue are clearly correlated. Furthermore, the number of active sites of the catalyst increased and the electrostatic interaction between fluorine and titanium formed a F-Ti dipole moment, which intensified the interaction between the negatively charged TiO− ion and the positively charged quinone methylene blue molecule. The lone pair electron of N in the quinone methylene blue molecule and the 3d orbital of Ti formed a metastable complex through coordination, and demethylation of the methylene blue molecules was completed.

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Mechanism of One-Step Hydrothermally Synthesized Titanate Catalysts for Ozonation

et al. 2022

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A titanate nanotube catalyst for ozonation was synthesized with a simple one-step NaOH hydrothermal treatment without energy-consuming calcination. The synthesized titania catalysts were characterized by X-ray diffraction (XRD), Raman, porosimetry analysis, high-resolution transmission electron microscopy (HR-TEM), Fourier transformed infrared (FTIR), and electron paramagnetic resonance (EPR) analysis. The catalyst treated with a higher concentration of NaOH was found to be more catalytically active for phenol removal due to its higher titanate content that would facilitate more OH groups on its surface. Furthermore, the main active oxidizing species of the catalytic ozonation process were recognized as singlet oxygen and superoxide radical, while the hydroxyl radical may only play a minor role. This work provides further support for the correlation between the properties of titania and catalytic performance, which is significant for understanding the mechanism of catalytic ozonation with titania-based materials.

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Degradation of the ammonia wastewater in aqueous medium with ozone in combination with mesoporous TiO2 catalytic

Cited by 3 publications

References 11 publications

Photocatalytic performance of biochar-modified TiO₂(C/TiO₂) for ammonia–nitrogen removal

Photocatalytic performance of biochar-modified TiO₂(C/TiO₂) for ammonia–nitrogen removal

Fluorine-regulated surface chemical state of titanium dioxide (TiO

Mechanism of One-Step Hydrothermally Synthesized Titanate Catalysts for Ozonation

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Degradation of the ammonia wastewater in aqueous medium with ozone in combination with mesoporous TiO2 catalytic

Cited by 3 publications

References 11 publications

Photocatalytic performance of biochar-modified TiO2(C/TiO2) for ammonia–nitrogen removal

Photocatalytic performance of biochar-modified TiO2(C/TiO2) for ammonia–nitrogen removal

Fluorine-regulated surface chemical state of titanium dioxide (TiO

Mechanism of One-Step Hydrothermally Synthesized Titanate Catalysts for Ozonation

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Product

Resources

About

Photocatalytic performance of biochar-modified TiO₂(C/TiO₂) for ammonia–nitrogen removal

Photocatalytic performance of biochar-modified TiO₂(C/TiO₂) for ammonia–nitrogen removal