Strong visible absorption and excellent photocatalytic performance of brown TiO 2 nanoparticles synthesized using one-step low-temperature process

Wang, Ting; Li, Wanwen; Xu, Dandan; Wu, Xuanmin; Cao, Lei; Meng, Jianxin

doi:10.1016/s1872-2067(17)62855-9

Cited by 22 publications

(4 citation statements)

References 44 publications

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“…Wang et al synthesized brown TiO 2 at low temperature (150 °C) by NaH treatment and utilized it in photodegradation of phenol under UV and visible light illumination . In another work, brown TiO 2 was synthesized at 140 °C and implemented in the photodegradation of methylene blue . Considering all these reports, including ours, we tried to develop a defect-rich TiO 2 at low temperature, 90 °C (less than the previous reports), which resulted in the formation of defective brown TiO 2– x porous flower aggregates.…”

Section: Introductionmentioning

confidence: 86%

“…12 In another work, brown TiO 2 was synthesized at 140 °C and implemented in the photodegradation of methylene blue. 20 Considering all these reports, including ours, we tried to develop a defect-rich TiO 2 at low temperature, 90 °C (less than the previous reports), which resulted in the formation of defective brown TiO 2−x porous flower aggregates. Thus, here it has been confirmed that Mn(II) can act as a reducing agent as well as a template for the synthesis of broad and longer wavelength absorbing materials for photocatalysis.…”

Section: ■ Introductionmentioning

confidence: 88%

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Defect-Rich Brown TiO_2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

Ullattil

Ramakrishnan

2018

ACS Appl. Nano Mater.

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A low-temperature, Mn(II)-assisted sol-solvothermal strategy has been developed for the synthesis of positively surface-charged defective brown TiO 2−x flower aggregates with porous nature. The porous structure possessed enormous surface defect states such as trivalent titanium ion (Ti 3+ ) and oxygen vacancy (V o ) sites. The defect states present in the brown TiO 2−x facilitated enhanced absorption even in the NIR region of the solar spectrum, whereas for the negatively surface-charged TiO 2 sample, synthesized in the absence of Mn(II), the absorption was limited to the visible region. Obviously, band-gap narrowing occurred for brown TiO 2−x as compared to the yellow TiO 2 synthesized in the absence of Mn(II). Interestingly, studying the photocatalytic efficiency of these materials using a methyl orange−methylene blue (MO-MB) dye mixture model system under solar illumination revealed selective photocatalytic reversibility, with MB and MO photodegradation performed by yellow TiO 2 and brown TiO 2−x , respectively. This is the first report on the use of surface-charged brown TiO 2−x with porous flower aggregate morphology for selective photocatalysis.

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Section: Introductionmentioning

confidence: 86%

Section: ■ Introductionmentioning

confidence: 88%

Defect-Rich Brown TiO_2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

Ullattil

Ramakrishnan

2018

ACS Appl. Nano Mater.

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“…21-1272 for anatase and JCPDS card No. 21-1276 for rutile [25,26], it contains both anatase and rutile phases with a domination of anatase just like the pristine Degussa P25 [26,27], and no remarkable phase transformation occurred due to the low calcination temperature (400 • C), as observed by others [26,28]. The crystallite average size calculated using the Scherrer equation was found to be about 40 nm, well comparable to the particles size obtained from field emission scanning electron microscope (FE-SEM) images.…”

Section: Characterization Of Photocatalystsmentioning

confidence: 99%

Comparing Photocatalytic Degradation of Gaseous Ethylbenzene Using N-doped and Pure TiO2 Nano-Catalysts Coated on Glass Beads under Both UV and Visible Light Irradiation

Kamaei

Rashedi

Dastgheib³

et al. 2018

Catalysts

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Volatile Organic Compounds (VOCs) are within the main industrial air pollutants whose release into the atmosphere is harmful to the ecosystem and human health. Gas-phase photocatalytic degradation of ethylbenzene, an aromatic VOC emitted from various sources, has been investigated in this study using TiO2 nanoparticle-coated glass beads in an annular photoreactor. To use visible light irradiation, TiO2 nanoparticles were doped by nitrogen using urea. The results showed that nitrogen doping significantly increased the removal efficiency of ethylbenzene under visible light irradiation compared with the pure TiO2, so that the removal efficiencies between 75–100% could be yielded for the initial ethylbenzene concentrations up to 0.13 g/m3 under visible light which could be useful for improving indoor air quality. The UV irradiated reactor needed less residence time and much higher removal efficiencies could be yielded at high initial concentrations. When the residence time under UV irradiation was one third of the same under visible light, the removal efficiency was more than 80% for the inlet concentrations up to 0.6 g/m3, whereas the removal efficiency under visible light was about 25% at this inlet concentration. Langmuir-Hinshelwood kinetic model could be well fitted to the photocatalytic reaction in both irradiation systems.

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“…In 2011, Chen et al [39] synthesized the first black TiO 2 nanomaterial for photocatalysis, by thermally converting stoichiometric anatase TiO 2 into defective nanocrystals, with strong visible light absorption and photocatalytic activity for H 2 generation, at 200 °C under high H 2 pressure. Previous studies [40,41] have successfully shown that the level of O v on the structure of reduced TiO x greatly depends on the synthesis conditions, such that different levels of O v could be generated in the structure of TiO x . Wang et al [42,43] succeeded in synthesizing black-and brown-TiO 2 by using a straightforward modified sol-gel method assisted with cetyltrimethyl ammonium bromide (CTAB) as a reducing agent.…”

Section: Introductionmentioning

confidence: 99%

The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiO_x Catalysts

Yazdanpanah,

Fereidooni,

Márquez

et al. 2023

ChemSusChem

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Recently, interest in converting bio‐derived fatty acid methyl esters (FAMEs) into added‐value products has significantly increased. The selectivity of ketonization reaction in the conversion of the FAMEs has significantly hampered the efficiency of this process. Herein, we prepared catalysts with different levels of oxygen vacancies while the crystal phase remained unchanged. The catalyst with the highest level of oxygen vacancy exhibited the maximum selectivity. The density functional theory (DFT) simulation showed an increase in interatomic distances leading to the formation of frustrated Lewis pairs (FLPs) upon the creation of oxygen vacancies. The surface measurements, type and density of acid sites of the catalysts, showed that the Lewis acid sites enhanced the selectivity for ketone production; while Bronsted acid sites increased the formation of by‐products. Moreover, the ketone formation rate was directly proportional to acid density. The findings of this research provide a different approach for catalyst design, based on defects engineering and their effect on the surface activity, which could be used for enhancing the catalytic performance of novel metal oxides.

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Strong visible absorption and excellent photocatalytic performance of brown TiO 2 nanoparticles synthesized using one-step low-temperature process

Cited by 22 publications

References 44 publications

Defect-Rich Brown TiO_2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

Defect-Rich Brown TiO_2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

Comparing Photocatalytic Degradation of Gaseous Ethylbenzene Using N-doped and Pure TiO2 Nano-Catalysts Coated on Glass Beads under Both UV and Visible Light Irradiation

The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiO_x Catalysts

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Strong visible absorption and excellent photocatalytic performance of brown TiO 2 nanoparticles synthesized using one-step low-temperature process

Cited by 22 publications

References 44 publications

Defect-Rich Brown TiO2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

Defect-Rich Brown TiO2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

Comparing Photocatalytic Degradation of Gaseous Ethylbenzene Using N-doped and Pure TiO2 Nano-Catalysts Coated on Glass Beads under Both UV and Visible Light Irradiation

The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiOx Catalysts

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Defect-Rich Brown TiO_2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

Defect-Rich Brown TiO_2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiO_x Catalysts