Enhanced photocatalytic oxidation of As(Ⅲ) by TiO2 modified with Fe3O4 through Ti－O－Fe interface bonds

Xiao, Ming; Li, Ruixue; Yin, Jinglin; Yang, Junhui; Hu, Xinyu; Xiao, Hongbo; Wang, Wenlei; Yang, Ting

doi:10.1016/j.colsurfa.2022.129678

Cited by 25 publications

(7 citation statements)

References 43 publications

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“…In a neutral or alkaline solution, the precipitation of Fe(III) and Cr(III) could be formed and deposited on the catalyst surface, resulting in the restriction of the contact between UV irradiations and the TiO 2 surface [15] . On the other hand, the desorption of negative species of As(V) (HAsO 4 2− , AsO 4 3− ) from the negative surface charge of TiO 2 was promoted in alkaline medium, leading to the light enhancement of As(III) oxidation in solution pH 9 [7,22] . Therefore, the simultaneous removal of As(III) and Cr(VI) experiments were conducted in the acidic solution in this study.…”

Section: Resultsmentioning

confidence: 99%

“…[15] On the other hand, the desorption of negative species of As(V) (HAsO 4 2À , AsO 4 3À ) from the negative surface charge of TiO 2 was promoted in alkaline medium, leading to the light enhancement of As(III) oxidation in solution pH 9. [7,22] Therefore, the simultaneous removal of As(III) and Cr(VI) experiments were conducted in the acidic solution in this study.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

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The Simultaneous Photooxidation of As(III) and Photoreduction of Cr(VI) in the Presence of Fe(III) in Aqueous Solution by UV/TiO₂ Process: Performance and Mechanism

Luong,

2023

ChemistrySelect

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Photocatalytic redox removal of As(III) and Cr(VI) in aqueous solution was investigated by UV/TiO2/Fe(III) process under various conditions. Fabricated TiO2 film was synthesized by the impregnation method, and used as photocatalyst in this study. The simultaneous removal of As(III) and Cr(VI) enhanced by 55 % and 24 % by adding Fe(III) in acidic solution under UV irradiation within 90 min. The reaction rate for As(III) oxidation and Cr(VI) reduction reached the highest value in acidic solution and high UV light intensity. The effect of inorganic ions on As(III) removal efficiency followed the order of SO42−>Cl−> , meanwhile, there was no inhibition on Cr(VI) reduction. Trapping experiment results indicated that the photogenerated holes coupled with ⋅OH radicals contributed to As(III) oxidation; photogenerated electrons and Fe(II) were responsible for Cr(VI) reduction. Kinetic analysis using Langmuir‐Hinshelwood (L‐H) model for As(III) photooxidation and Cr(VI) photoreduction were presented and the possible mechanism was proposed in this study.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Solution Phmentioning

confidence: 99%

The Simultaneous Photooxidation of As(III) and Photoreduction of Cr(VI) in the Presence of Fe(III) in Aqueous Solution by UV/TiO₂ Process: Performance and Mechanism

Luong,

2023

ChemistrySelect

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“…[53] In addition, the homogeneously distributed carbon can efficiently transfer electrons through TiÀ OÀ Fe tetrahedra and oxygen vacancies in the photocatalytic process, due to its high light absorption ability and π-π conjugation structure. As a result, the energy can be more used to excite photogenerated e À and h + , and the separation rate of photogenerated e À and h + can be facilitated via TiÀ OÀ Fe and wrapped C. [54] As shown in Eqs. (1)(2)(3), under the motivation of light, Fe 3 + can capture the superficial electrons to form Fe 2 + .…”

Section: Enhancement Mechanismmentioning

confidence: 99%

Self‐sacrificial Templated Synthesis of Fe/N Co‐doping TiO₂ for Enhanced CO₂ Photocatalytic Reduction

Liu,

Qileng,

Wubulikasimu

et al. 2023

ChemNanoMat

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As a green photocatalyst, TiO2 has been widely used in adsorption, desorption and redox reaction, but the wide energy band and moderate visible light absorption have greatly inhibited its applications in photocatalysis. The effective method of enhancing the performance of catalysts is the development of heterojunction and metal‐nonmetal co‐doping. Herein, Fe‐N co‐doped TiO2 heterojunction photocatalysts (FexTi@C) were successfully synthesized by calcining a self‐sacrificial template (NH2‐MIL‐125(Ti)) injected with Fe3+ solution. X‐ray diffraction (XRD), transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS), N2 adsorption/desorption analysis, and photoelectrochemical tests were used to characterize FexTi@C, showing multiple rutile/anatase TiO2 heterojunction structure, low bandgap, and significant absorption in visible light. In addition, the Ti‐O‐Fe tetrahedra and more oxygen vacancies were provided since the doped N is from the pristine MOF and the radii of Fe3+ and Ti4+ are similar, which improved the photocatalytic efficiency of CO2 reduction to CH4, especially the Fe0.8Ti@C reached 7.8‐fold and 10.2‐fold CH4 yield increase compared with the original TiMOF template and the undoped Ti@C, respectively. This work presents a simple method for the fabrication of low bandgap semiconductors, and also makes a new attempt at the synergistic effect between the in‐situ elements and valence bonds of MOF‐derived catalysts.

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“…Furthermore, the different operational conditions and lack of standardization of the reported results make the direct comparison of experiments difficult. As an example, using the TiO 2 @Fe 3 O 4 photocatalyst, Xiao et al [32] achieved complete As(III) oxidation in only 4 min of photocatalytic reaction. However, since the authors used 10 mg of catalyst in suspension in 40 mL of treated solution with an As(III) initial concentration of 10 mg L −1 , the direct comparison with the results obtained in the present article is very imprecise.…”

Section: As(iii) Oxidation By Gpf-tio2/uva-irradiated Annular Reactormentioning

confidence: 99%

Development of a Novel 3D Highly Porous Structure for TiO2 Immobilization and Application in As(III) Oxidation

Scherer Filho,

Marinho,

Vignola

et al. 2023

Sustainability

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One of the main drawbacks of the application of photocatalysis for wastewater treatment is the use of dispersed photocatalysts, which are difficult to remove from effluent after the treatment process and may pose additional toxicity to the receiving bodies. As an alternative, immobilized catalysts can be applied; however, this strategy can increase the difficulties in mass and photo transfer. This work presents the development of an inert and highly porous support for TiO2 immobilization. The produced materials have a high surface area and contribute to diminishing the difficulties in mass and phototransfer during photocatalysis. Different types of polymeric materials were tested as support, and a Taguchi experimental design with an L9 arrangement was used to optimize the immobilization process and evaluate the effect of TiO2 content and the use of bidding agents, ultrasound, and thermic treatment. The grey automotive polyurethane foam proved to be the best support, using 5.0% of TiO2 (wt.%) in the immobilization suspension with Triton X as the binding agent and heat treatment during immobilization. At the optimal conditions, it was possible to achieve total As(III) oxidation (below the analytical detection limit) in 240 min, with nearly 100% As(V) present in solution at the end of the reaction (almost no As adsorption on the catalyst surface). In addition, the catalytic bed was able to promote the As(III) complete oxidation in up to five consecutive cycles without significant leaching or deactivation of the immobilized TiO2.

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Enhanced photocatalytic oxidation of As(Ⅲ) by TiO2 modified with Fe3O4 through Ti－O－Fe interface bonds

Cited by 25 publications

References 43 publications

The Simultaneous Photooxidation of As(III) and Photoreduction of Cr(VI) in the Presence of Fe(III) in Aqueous Solution by UV/TiO₂ Process: Performance and Mechanism

The Simultaneous Photooxidation of As(III) and Photoreduction of Cr(VI) in the Presence of Fe(III) in Aqueous Solution by UV/TiO₂ Process: Performance and Mechanism

Self‐sacrificial Templated Synthesis of Fe/N Co‐doping TiO₂ for Enhanced CO₂ Photocatalytic Reduction

Development of a Novel 3D Highly Porous Structure for TiO2 Immobilization and Application in As(III) Oxidation

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Enhanced photocatalytic oxidation of As(Ⅲ) by TiO2 modified with Fe3O4 through Ti－O－Fe interface bonds

Cited by 25 publications

References 43 publications

The Simultaneous Photooxidation of As(III) and Photoreduction of Cr(VI) in the Presence of Fe(III) in Aqueous Solution by UV/TiO2 Process: Performance and Mechanism

The Simultaneous Photooxidation of As(III) and Photoreduction of Cr(VI) in the Presence of Fe(III) in Aqueous Solution by UV/TiO2 Process: Performance and Mechanism

Self‐sacrificial Templated Synthesis of Fe/N Co‐doping TiO2 for Enhanced CO2 Photocatalytic Reduction

Development of a Novel 3D Highly Porous Structure for TiO2 Immobilization and Application in As(III) Oxidation

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The Simultaneous Photooxidation of As(III) and Photoreduction of Cr(VI) in the Presence of Fe(III) in Aqueous Solution by UV/TiO₂ Process: Performance and Mechanism

The Simultaneous Photooxidation of As(III) and Photoreduction of Cr(VI) in the Presence of Fe(III) in Aqueous Solution by UV/TiO₂ Process: Performance and Mechanism

Self‐sacrificial Templated Synthesis of Fe/N Co‐doping TiO₂ for Enhanced CO₂ Photocatalytic Reduction