Removal of aqueous chromium and environmental CO2 by using photocatalytic TiO2 doped with tungsten

Trejo-Valdéz, M.; Hernández-Guzmán, S.R.; Manríquez-Ramírez, María Elena; Sobral, H.; Martínez‐Gutiérrez, Hugo; Torres-Torres, C.

doi:10.1016/j.jhazmat.2018.05.008

Cited by 20 publications

(2 citation statements)

References 19 publications

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“…To address the aforementioned limitations, doping TiO 2 with metal ions offers a feasible and cost-effective approach to adjust surface states, electronic characteristics, and charge transfer processes, thereby enhancing photocatalytic activity. − For example, Liu et al investigated the H 2 S photocatalytic degradation on a series of TiO 2 photocatalysts modified by Mn, Cu, Ni, and Co and found that 1 wt % Mn-TiO 2 exhibited the highest H 2 S removal efficiency (89.9%, higher than that of pure TiO 2 ) . The photocatalytic activity of a catalyst is directly influenced by factors such as the concentration and distribution of the metal dopant ions, the alignment of energy levels between the dopant and TiO 2 , and the transfer and recombination of charge carriers.…”

Section: Introductionmentioning

confidence: 99%

Trivalent Metal Ions (Al, Ga, In)-Doped TiO₂ for Enhanced Photocatalytic Desulfurization of H₂S: Band Structure Regulation, Performance, and Mechanism

Huang,

He,

Yuan

et al. 2024

Ind. Eng. Chem. Res.

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Rationally regulating the photogenerated carrier transfer behavior and band structure of TiO 2 through metal doping is an effective strategy for enhancing the photocatalytic activity in the removal of malodorous gas hydrogen sulfide (H 2 S). In this study, TiO 2 modified with the doping of Group IIIA metal ions (Al 3+ , Ga 3+ , and In 3+ ) was utilized as an efficient photocatalytic desulfurizer under ultraviolet irradiation. Among these samples, the 4% In-TiO 2 exhibited the best photocatalytic H 2 S removal efficiency of 100% for a duration of 120 min, nearly 3 times higher than that of commercial P25 TiO 2 . The UV−vis DRS and PL spectra demonstrated that the incorporation of Group-IIIA metal ions into TiO 2 resulted in the formation of a shallow acceptor level above the valence band in the energy band structure, which induced a slight redshift at the edge of the visible light absorption band and reduced the electron−hole recombination rate. In situ DRIFTS and DFT calculations revealed that the adsorption and activation of H 2 S occurred simultaneously on In-TiO 2 , facilitated by its strong oxygen vacancy formation and adsorption capability. The ln 3+ doping into TiO 2 promoted photothermalcatalytic oxidation reaction on the surfaces of In-TiO 2 , thereby significantly enhancing the desulfurization efficiency of H 2 S. This study not only offers a deeper understanding of the regulated band structure of TiO 2 by doping of Group IIIA metal ions, but also provides a promising and green photocatalytic desulfurizer of In-TiO 2 for efficient removal of H 2 S.

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Section: Introductionmentioning

confidence: 99%

Trivalent Metal Ions (Al, Ga, In)-Doped TiO₂ for Enhanced Photocatalytic Desulfurization of H₂S: Band Structure Regulation, Performance, and Mechanism

Huang,

He,

Yuan

et al. 2024

Ind. Eng. Chem. Res.

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“…Various physical and chemical techniques such as photocatalysis [ 12 ], biological treatment [ 13 ], electrodialysis [ 14 ], membrane filtration [ 15 ] and adsorption [ 16 ] have been applied for the removal of Cr(VI) from industrial wastewater. Compared with other methods, photocatalytic reduction can be carried out under mild reaction conditions to convert highly-toxic Cr(VI) into low-toxic Cr(III), achieving the essential removal of Cr(VI) [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Mass Transfer Process for Photocatalytic Reduction in Cr(VI) by Electric Field Assistance

Feng,

Lin,

Gan

et al. 2024

IJMS

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The removal of Cr(VI), a highly-toxic heavy metal, from industrial wastewater is a critical issue in water treatment research. Photocatalysis, a promising technology to solve the Cr(VI) pollution problem, requires urgent and continuous improvement to enhance its performance. To address this need, an electric field-assisted photocatalytic system (PCS) was proposed to meet the growing demand for industrial wastewater treatment. Firstly, we selected PAF-54, a nitrogen-rich porous organic polymer, as the PCS’s catalytic material. PAF-54 exhibits a large adsorption capacity (189 mg/g) for Cr(VI) oxyanions through hydrogen bonding and electrostatic interaction. It was then coated on carbon paper (CP) and used as the photocatalytic electrode. The synergy between capacitive deionization (CDI) and photocatalysis significantly promotes the photoreduction of Cr(VI). The photocatalytic performance was enhanced due to the electric field’s influence on the mass transfer process, which could strengthen the enrichment of Cr(VI) oxyanions and the repulsion of Cr(III) cations on the surface of PAF-54/CP electrode. In addition, the PCS system demonstrates excellent recyclability and stability, making it a promising candidate for chromium wastewater treatment.

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Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets (TnS-Pz) of high photocatalytic activity: characterization and application for Cr(VI) reduction in an aqueous solution

Novack

Reis

Hackbarth

et al. 2020

Environ Sci Pollut Res

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Removal of aqueous chromium and environmental CO2 by using photocatalytic TiO2 doped with tungsten

Cited by 20 publications

References 19 publications

Trivalent Metal Ions (Al, Ga, In)-Doped TiO₂ for Enhanced Photocatalytic Desulfurization of H₂S: Band Structure Regulation, Performance, and Mechanism

Trivalent Metal Ions (Al, Ga, In)-Doped TiO₂ for Enhanced Photocatalytic Desulfurization of H₂S: Band Structure Regulation, Performance, and Mechanism

Enhancement of Mass Transfer Process for Photocatalytic Reduction in Cr(VI) by Electric Field Assistance

Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets (TnS-Pz) of high photocatalytic activity: characterization and application for Cr(VI) reduction in an aqueous solution

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Removal of aqueous chromium and environmental CO2 by using photocatalytic TiO2 doped with tungsten

Cited by 20 publications

References 19 publications

Trivalent Metal Ions (Al, Ga, In)-Doped TiO2 for Enhanced Photocatalytic Desulfurization of H2S: Band Structure Regulation, Performance, and Mechanism

Trivalent Metal Ions (Al, Ga, In)-Doped TiO2 for Enhanced Photocatalytic Desulfurization of H2S: Band Structure Regulation, Performance, and Mechanism

Enhancement of Mass Transfer Process for Photocatalytic Reduction in Cr(VI) by Electric Field Assistance

Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets (TnS-Pz) of high photocatalytic activity: characterization and application for Cr(VI) reduction in an aqueous solution

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Trivalent Metal Ions (Al, Ga, In)-Doped TiO₂ for Enhanced Photocatalytic Desulfurization of H₂S: Band Structure Regulation, Performance, and Mechanism

Trivalent Metal Ions (Al, Ga, In)-Doped TiO₂ for Enhanced Photocatalytic Desulfurization of H₂S: Band Structure Regulation, Performance, and Mechanism