Preparation of Cr‐doped TiO<sub>2</sub>/SiO<sub>2</sub> Photocatalysts and their Photocatalytic Properties

Chen, Rufen; Liu, Huating

doi:10.1002/jccs.201190149

Cited by 7 publications

(5 citation statements)

References 30 publications

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“…41 Diffractogram patterns in Figure 1b demonstrate that all samples with a low Cr amount or in other words with a high (Si +Ti)/Cr ratio show only TiO 2 peaks with a dominant anatase phase. 42 Our XRD results illustrate that the Si and Cr introduce a substantial amount of disorder into the TiO 2 lattice altering the crystallinity, and these observation are in correspondence with the visible light photocatalytic activity results. Our Cr/Ti/ Si ternary catalysts do reveal enriched photocatalytic activity and stability under the visible light irradiation compared to the intrinsic Cr/TiO 2 .…”

Section: Resultssupporting

confidence: 81%

“…Moreover, the atomic radius sizes of Ti 4+ (0.061 nm) and Cr 6+ (0.058) as well as Cr 3+ (0.062) are nearly the same; for this reason Cr n + ions insert into the structure of TiO 2 and occupy the lattice sites to form a ternary solid solution . Diffractogram patterns in Figure b demonstrate that all samples with a low Cr amount or in other words with a high (Si+Ti)/Cr ratio show only TiO 2 peaks with a dominant anatase phase . Our XRD results illustrate that the Si and Cr introduce a substantial amount of disorder into the TiO 2 lattice altering the crystallinity, and these observation are in correspondence with the visible light photocatalytic activity results.…”

Section: Results and Discussionsupporting

confidence: 79%

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Stabilization of Cr in Ti/Si/Cr Ternary Composites by Aerosol Flame Spray-Assisted Synthesis for Visible-Light-Driven Photocatalysis

Inturi

Boningari

Suidan

et al. 2016

Ind. Eng. Chem. Res.

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We have successfully stabilized Cr leaching in Ti/Cr/Si ternary composites by adopting the Flame Spray Pyrolysis (FSP) synthesis technique and achieving higher photocatalytic activity in the visible light region. Initially, we have prepared a series of catalysts with different Si/Ti atomic ratios (80, 75, 70, 60, and 50) as well as (Si+Ti)/Cr ratios (8, 10, 15, 20, 25, and 30) and investigated their visible light photocatalytic activity. The effect of the Si and Cr atoms on the structural, optical, and photocatalytic properties of TiO 2 has been investigated. Our XRD studies reveal that the (Si+Ti)/Cr ratios and Si/Ti atomic ratios alter the TiO 2 lattice structure, with an increase in the Si ratio in the catalyst reduction of the rutile phase being observed. An increase in the Si/Ti atomic ratio from 50 to 75 monotonically transformed the rutile phase into the anatase phase. Introduction of Cr induced a substantial amount of disorder into the TiO 2 lattice and altered the crystallinity. A high amount of Cr in the catalyst led to the transition from the tetrahedral coordination of CrO 3 to the hexagonal coordination of Cr 2 O 3 oxide and implies the segregation of chromium out of the TiO 2 lattice. Dropping the Cr amount (an increase in the (Si +Ti)/Cr atomic ratio) to within solubility limits would solve the difficulties accompanying Cr 2 O 3 segregation out of TiO 2 . The addition of SiO 2 into the titania lattice greatly promoted the surface texture by enhancing the surface area by four times the commercial TiO 2 . The introduction of Cr extended the visible light absorption of the catalyst to 550 nm. Our H 2 -TPR results suggest that the increase in the Si/Ti atomic ratio greatly promoted the suppression of the Cr 2 O 3 phase in the catalyst along with an increase in reduction potential of Cr 6+ . It is found in our studies that Cr has an imperative role in the photocatalytic activity, while the SiO 2 was found to be responsible for the stability of the photocatalyst. We have observed that the optimal flame-made Cr/Ti/Si catalyst demonstrated an extremely low level of Cr and Ti leaching throughout the photocatalytic degradation reaction, therefore inhibiting the contamination of the treated wastewater due to secondary metal leaching. We observed a stable Cr(IV) concentration for the reused catalyst, which plays an important role in improved and stable photocatalytic activity in the visible region for the materials. Unlike the Cr/TiO 2 systems, the optimal flame-made Cr/Ti/Si catalyst established high efficiency in visible photocatalysis, stability, and reusability without any Cr leaching even after five consecutive cycles.

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Section: Resultssupporting

confidence: 81%

Section: Results and Discussionsupporting

confidence: 79%

Stabilization of Cr in Ti/Si/Cr Ternary Composites by Aerosol Flame Spray-Assisted Synthesis for Visible-Light-Driven Photocatalysis

Inturi

Boningari

Suidan

et al. 2016

Ind. Eng. Chem. Res.

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“…[ 41,42 ] Therefore, different surfactants formed different micelle sizes, which led to various pore sizes. [ 43 ] In addition, both catalysts also had mesopores, which were smaller than 2.6 nm. The mean of these smaller mesopores' size for MTN was 2.3 nm, whereas P25 was 2.4 nm.…”

Section: Resultsmentioning

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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“…Large surface areas are needed for materials in dye sensitized solar cells in order to enable adequate light absorption and charge separations, which are the two crucial steps in the solar-electric conversion process. [2] Removing the color from industrial waste water is a topic of concern right now in every country on earth. One to twenty percent of the total amount of dye used is thought to be lost during the dying process and enters the receiving bodies [3].…”

Section: Introductionmentioning

confidence: 99%

To study the synthesis and characterization of photocatalyst TiO₂/SiO₂ nanocomposite prepared by Co-Precipitation method

Gupta,

Sharma,

Vashishtha

et al. 2023

E3S Web of Conf.

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We report here the synthesis of Nanocomposites of TiO2/SiO2 by the wet chemical method i.e. Coprecipitation method. The sample of TiO2 and SiO2 and composite of TiO2/SiO2 calcined at 600 °C and were structurally analyzed by X-Ray Diffraction. The values of cell parameter, Wyckoff position, sites etc. of prepared samples were also calculated. The size of the crystal of TiO2/SiO2 nanocomposites was obtained as 33.2 nm. The visualization of crystal structure of both TiO2 and SiO2 were also discussed in this paper.

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Preparation of Cr‐doped TiO₂/SiO₂ Photocatalysts and their Photocatalytic Properties

Cited by 7 publications

References 30 publications

Stabilization of Cr in Ti/Si/Cr Ternary Composites by Aerosol Flame Spray-Assisted Synthesis for Visible-Light-Driven Photocatalysis

Stabilization of Cr in Ti/Si/Cr Ternary Composites by Aerosol Flame Spray-Assisted Synthesis for Visible-Light-Driven Photocatalysis

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

To study the synthesis and characterization of photocatalyst TiO₂/SiO₂ nanocomposite prepared by Co-Precipitation method

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Preparation of Cr‐doped TiO2/SiO2 Photocatalysts and their Photocatalytic Properties

Cited by 7 publications

References 30 publications

Stabilization of Cr in Ti/Si/Cr Ternary Composites by Aerosol Flame Spray-Assisted Synthesis for Visible-Light-Driven Photocatalysis

Stabilization of Cr in Ti/Si/Cr Ternary Composites by Aerosol Flame Spray-Assisted Synthesis for Visible-Light-Driven Photocatalysis

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

To study the synthesis and characterization of photocatalyst TiO2/SiO2 nanocomposite prepared by Co-Precipitation method

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Preparation of Cr‐doped TiO₂/SiO₂ Photocatalysts and their Photocatalytic Properties

To study the synthesis and characterization of photocatalyst TiO₂/SiO₂ nanocomposite prepared by Co-Precipitation method