Highly efficient sunlight-driven reduction of Cr(VI) by TiO2@NH2-MIL-88B(Fe) heterostructures under neutral conditions

Yuan, Ran; Yue, Chao; Qiu, Jinli; Liu, Fuqiang; Li, Aimin

doi:10.1016/j.apcatb.2019.03.068

Cited by 237 publications

(55 citation statements)

References 70 publications

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“…The characteristic absorption bands of the oxygen-containing functional groups were observed in the Fourier-transform infrared spectroscopy (FT-IR) profile of MIL-101 ( Fig. 2(a)), and the absorption peaks at 1400 and 1610, 1524, and 1700 cm −1 represent the asymmetric stretching of the C-O-C carboxylate group in the BDC ligand, typical vibration of the stretching of the C=C bonds of the benzene ring, and symmetric stretching of the C=O carboxylate group in the BDC ligand, respectively [46]. The FT-IR spectrum of the MT composite was similar to that of MIL-101, which indicated that MIL-101 was still present in the structure of MT after the hydrothermal reaction.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of core-shell nanostructured Cr2O3/C@TiO2 for photocatalytic hydrogen production

Yang

Mao

Tang

et al. 2021

Chinese Journal of Catalysis

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Section: Resultsmentioning

confidence: 99%

Synthesis of core-shell nanostructured Cr2O3/C@TiO2 for photocatalytic hydrogen production

Yang

Mao

Tang

et al. 2021

Chinese Journal of Catalysis

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“…Cu(II)-porphyrin and TiO 2 nanoparticles into MOF structure (PCN-224(Cu)) leads to a marked improvement of light-harvesting features and promotes separation of photogenerated charges, reaching superior photocatalytic performance for CO 2 reduction [219,256]. Also, composites or heterostructures of titanium oxide or titanate fibers and MOFs, such as TiO 2 @NH 2 -MIL-88B(Fe), disclose high photocatalytic activity [257][258][259]. Recently, novel heterojunctions, based on bismuthoxyhalide-MOFs composites, were successfully produced by controlled growth of BiOX (X=Cl, Br) nanosheets on the surface of NH 2 -UiO-66 and NH 2 -MIL-125 (Ti).…”

Section: Encapsulation Of Photocatalytic Active Species (Mof Compositmentioning

confidence: 99%

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

2020

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Solar radiation is becoming increasingly appreciated because of its influence on living matter and the feasibility of its application for a variety of purposes. It is an available and everlasting natural source of energy, rapidly gaining ground as a supplement and alternative to the nonrenewable energy feedstock. Actually, an increasing interest is involved in the development of efficient materials as the core of photocatalytic and photothermal processes, allowing solar energy harvesting and conversion for many technological applications, including hydrogen production, CO2 reduction, pollutants degradation, as well as organic syntheses. Particularly, photosensitive nanostructured hybrid materials synthesized coupling inorganic semiconductors with organic compounds, and polymers or carbon-based materials are attracting ever-growing research attention since their peculiar properties overcome several limitations of photocatalytic semiconductors through different approaches, including dye or charge transfer complex sensitization and heterostructures formation. The aim of this review was to describe the most promising recent advances in the field of hybrid nanostructured materials for sunlight capture and solar energy exploitation by photocatalytic processes. Beside diverse materials based on metal oxide semiconductors, emerging photoactive systems, such as metal-organic frameworks (MOFs) and hybrid perovskites, were discussed. Finally, future research opportunities and challenges associated with the design and development of highly efficient and cost-effective photosensitive nanomaterials for technological claims were outlined.

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“…The photoreduction process usually conducted in acidic condition as H + is required for the reduction of Cr(VI). However, recent studies reported the photoreduction also possible in neutral conditions [8,9] but the performance is still lower than in acidic condition.…”

Section: Introductionmentioning

confidence: 96%

Comparison of ZrO₂, TiO₂, and α-Fe₂O₃ nanotube arrays on Cr(VI) photoreduction fabricated by anodization of Zr, Ti, and Fe foils

Bashirom

Tan

Kawamura

et al. 2020

Mater. Res. Express

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This paper presents the fabrication of self-organized ZrO 2 , TiO 2 , and α-Fe 2 O 3 nanotube arrays by anodization of Zr, Ti, and Fe foils, respectively in fluoride-containing EG electrolyte at 40 V for 20 min. The as-anodized nanotubes were annealed in a tube furnace at 400°C for 3 h to induce the crystallization of the oxide film. Morphology, crystal structure, surface properties, and optical properties of the anodic ZrO 2 nanotubes (ZNTs), TiO 2 nanotubes (TNTs), and α-Fe 2 O 3 nanotubes (FNTs) were characterized by Field-Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), x-ray Diffraction (XRD), Fourier-Transform Infrared (FTIR) spectroscopy, Photoluminescence (PL) spectroscopy, and UV-visible Near-Infrared Diffuse Reflectance Spectra (UV-vis NIR DRS) spectroscopy, respectively. Based on the FESEM and TEM micrographs, ZNTs possessed the longest nanotubes (i.e. 9.6 μm) compared with TNTs and FNTs under the same anodization condition. The aspect ratio of the nanotubes can be arranged in the order of ZNTs>FNTs>TNTs. The surface of the annealed ZNTs, FNTs, and TNTs was enriched with -OH groups to facilitate the Cr(VI) adsorption. According to the UV-vis NIR DRS spectra, strong visible light absorption was observed on the FNTs due to their low band gap. Whereas, the TNTs predominantly absorbs the UV light at λ max =360 nm. Rapid Cr(VI) removal was observed on FNTs, i.e. 100% after 2 h activated by sunlight with negligible Cr(VI) removal for ZNTs and TNTs. When exposed to UVC (λ=254 nm), only 39% versus 37% Cr(VI) removal efficiencies were obtained on TNTs and ZNTs after 3 h suggesting sluggish electron transfer due to rapid charge carriers recombination as evident in the PL spectra.

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Highly efficient sunlight-driven reduction of Cr(VI) by TiO2@NH2-MIL-88B(Fe) heterostructures under neutral conditions

Cited by 237 publications

References 70 publications

Synthesis of core-shell nanostructured Cr2O3/C@TiO2 for photocatalytic hydrogen production

Synthesis of core-shell nanostructured Cr2O3/C@TiO2 for photocatalytic hydrogen production

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

Comparison of ZrO₂, TiO₂, and α-Fe₂O₃ nanotube arrays on Cr(VI) photoreduction fabricated by anodization of Zr, Ti, and Fe foils

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Highly efficient sunlight-driven reduction of Cr(VI) by TiO2@NH2-MIL-88B(Fe) heterostructures under neutral conditions

Cited by 237 publications

References 70 publications

Synthesis of core-shell nanostructured Cr2O3/C@TiO2 for photocatalytic hydrogen production

Synthesis of core-shell nanostructured Cr2O3/C@TiO2 for photocatalytic hydrogen production

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

Comparison of ZrO2, TiO2, and α-Fe2O3 nanotube arrays on Cr(VI) photoreduction fabricated by anodization of Zr, Ti, and Fe foils

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Comparison of ZrO₂, TiO₂, and α-Fe₂O₃ nanotube arrays on Cr(VI) photoreduction fabricated by anodization of Zr, Ti, and Fe foils