S-TiO2/UiO-66-NH2 composite for boosted photocatalytic Cr(VI) reduction and bisphenol A degradation under LED visible light

Li, Yuxuan; Wang, Xun; Wang, Chong-Chen; Fu, Huifen; Liu, Yanbiao; Wang, Peng; Zhao, Chen

doi:10.1016/j.jhazmat.2020.123085

Cited by 154 publications

(34 citation statements)

References 92 publications

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“…Photocatalysis is a green and cost-effective strategy to alleviate the thoughtful concerns of environmental worsening prompted by heavy metals arising from industrial wastes. − Among abundant poisonous heavy metals, carcinogenic chromium Cr(VI) is a notorious contaminant in the wastewater because of its high solubility. − The reduction of Cr(VI) to Cr(III) by a heterogeneous nano photocatalyst is the conceivable way for wastewater handling due to the inherent environmental pleasantness of chromium(III). , For this purpose, intensive research efforts have been devoted to developing photocatalysts such as zinc oxide (ZnO), titanium dioxide (TiO 2 ), etc . Unfortunately, following photocatalysts are limited in use because of moderate performance in the ultraviolet (UV) light irradiation conditions, which contain less r than 5% of total sunlight. , In order to solve this problem, many visible-light active photocatalysts such as WO 3 , SnS 2 , Ag 2 S, and CdS have been widely stated.…”

Section: Introductionmentioning

confidence: 99%

BiOCl-Coated UiO-66-NH₂ Metal–Organic Framework Nanoparticles for Visible-Light Photocatalytic Cr(VI) Reduction

Hussain

Mehmood

Azhar

et al. 2021

ACS Appl. Nano Mater.

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Pollutants in wastewater, such as Cr(VI) is a continuous threat to our ecological system and human well-being because of its high noxiousness and latent carcinogenicity. Photocatalytic Cr(VI) reduction is the most suitable and eco-friendly way to convert the toxic Cr(VI) to environmentally friendly Cr(III). Porous metal−organic frameworks (MOFs) based nanocomposites are emerging green photocatalysts for Cr(VI) reduction due to their unique characteristics such as high photoconductivity, large surface area, and suitable porous structure. Herein, the preparation of ultrathin BiOCl sheets over UiO-66-NH 2 is reported for the first time at room temperature via a simplistic in situ synthetic process to yield a series of UiO-66-NH 2 @BiOCl-UTN's heterogeneous nano composites. The activity toward Cr(VI) reduction was tested under visible-light. UiO-66-NH 2 @BiOCl-UTN's heterogeneous nanocomposites exhibited better performance as equated to individual BiOCl and UiO-66-NH 2 , particularly the composite with Bi 3+ mole ratio of 5 mM surpassed other composites for photocatalytic Cr(VI) reduction. Furthermore, boosted visible-light absorption (λ > 420 nm) was observed in the presence of −NH 2 moiety on the organic linker. The excellent photocatalytic activity was attributed to the synergistic effect between BiOCl and UiO-66-NH 2 for the effective separation of photogenerated electron−hole suppressing their recombination. Through active species trapping experiments, electron spin resonance measurements, and electrochemical analysis, the reliable mechanism was predicted and confirmed. Moreover, heterogeneous nanomaterial retained its structure and activity for four consecutive cycles demonstrating its superior stability.

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Section: Introductionmentioning

confidence: 99%

BiOCl-Coated UiO-66-NH₂ Metal–Organic Framework Nanoparticles for Visible-Light Photocatalytic Cr(VI) Reduction

Hussain

Mehmood

Azhar

et al. 2021

ACS Appl. Nano Mater.

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“…Here, α, υ, and E g represented absorption coe cient, frequency, and bandgaps respectively. This formula was the main calculation method of black TiO 2 bandgap and was widely used by researchers [27,28]. The bandgap of white TiO 2 (rutile) in our experiments was 2.94 eV which was closed to experienced data 3.0 eV, while black TiO 2 had constantly narrowing bandgaps with hydrogenation temperatures raising.…”

Section: Resultsmentioning

confidence: 74%

Highly stable visible‐light photocatalytic properties of black rutile TiO2 hydrogenated in ultrafast flow

Gao

Zhang

Huang

et al. 2021

J Mater Sci: Mater Electron

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The hydrogenation and introducing oxygen vacancies (V O ) can lead to surface lattice-disorder in TiO 2 , which is a new form of TiO 2 named black TiO 2 , with excellent visible-light photocatalytic activity, but this TiO 2 is easy to failure because oxidation makes the concentration of surface V O decrease rapidly in a short time. In this work, black TiO 2 nanoparticles with V O almost concentrated inside nanoparticles were fabricated under ultrafast hydrogen ow. These bulk V O shortened the bandgaps of black TiO 2 , enhanced its visible light absorption, and meanwhile provided extremely strong stability. A series of characterization methods con rmed the location of V O , and degradation experiments on Cr 6+ or rhodamine B demonstrated the good visible-light photocatalytic performance of our material. After 18 months of natural aging treatment (in the air), our samples showed no discoloration and maintained 89.5% photocatalytic e ciency, and further study exhibited that this black TiO 2 also contained excellent acidresistance and moderate alkaline-resistance. This work could help design lattice-disorder to obtain more stable and practical black TiO 2 .

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“…As revealed in Figure 7a and Figure 7b , the order of K app values of the photocatalytic reactions under different pH conditions is pH 4 (0.52 h −1 ) > pH 3 (0.35 h −1 ) > pH 5 (0.30 h −1 ) > pH 2 (0.13 h −1 ), suggesting that the optimal pH value is pH 4. It has been proven that the pH condition of the Cr(VI) pollutant solution has great effects on the surface potentials of photocatalysts, and Cr(VI) ions exist in the form of HCrO 4 − and Cr 2 O 7 2− in the reactions shown in Equation 3 and Equation 4 [ 55 ].…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Bi₂WO₆/TiO₂-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants

Lin¹,

Yang²,

Huang³

2022

Beilstein J. Nanotechnol.

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A series of Bi2WO6/TiO2-nanotube (Bi2WO6/TiO2-NT) heterostructured composites were prepared by utilizing natural cellulose (e.g., laboratory filter paper) as the structural template. The obtained nanoarchitectonics, namely Bi2WO6/TiO2-NT nanocomposites, displayed three-dimensionally interwoven structures which replicated the initial cellulose template. The composite Bi2WO6/TiO2-NT nanotubes were formed by TiO2 nanotubes that uniformly anchored with Bi2WO6 nanoparticles of various densities on the surface. The composites exhibited improved photocatalytic activities toward the reduction of Cr(VI) and degradation of rhodamine B under visible light (λ > 420 nm), which were attributed to the uniform anchoring of Bi2WO6 nanoparticles on TiO2 nanotubes, as well as strong mutual effects and well-proportioned formation of heterostructures in between the Bi2WO6 and TiO2 phases. These improvements arose from the cellulose-derived unique structures, leading to an enhanced absorption of visible light together with an accelerated separation and transfer of the photogenerated electron–hole pairs of the nanocomposites, which resulted in increased effective amounts of photogenerated carriers for the photocatalytic reactions. It was demonstrated that the photoinduced electrons dominated the photocatalytic reduction of Cr(VI), while hydroxyl radicals and reactive holes contributed to the photocatalytic degradation of rhodamine B.

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S-TiO2/UiO-66-NH2 composite for boosted photocatalytic Cr(VI) reduction and bisphenol A degradation under LED visible light

Cited by 154 publications

References 92 publications

BiOCl-Coated UiO-66-NH₂ Metal–Organic Framework Nanoparticles for Visible-Light Photocatalytic Cr(VI) Reduction

BiOCl-Coated UiO-66-NH₂ Metal–Organic Framework Nanoparticles for Visible-Light Photocatalytic Cr(VI) Reduction

Highly stable visible‐light photocatalytic properties of black rutile TiO2 hydrogenated in ultrafast flow

Hierarchical Bi₂WO₆/TiO₂-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants

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S-TiO2/UiO-66-NH2 composite for boosted photocatalytic Cr(VI) reduction and bisphenol A degradation under LED visible light

Cited by 154 publications

References 92 publications

BiOCl-Coated UiO-66-NH2 Metal–Organic Framework Nanoparticles for Visible-Light Photocatalytic Cr(VI) Reduction

BiOCl-Coated UiO-66-NH2 Metal–Organic Framework Nanoparticles for Visible-Light Photocatalytic Cr(VI) Reduction

Highly stable visible‐light photocatalytic properties of black rutile TiO2 hydrogenated in ultrafast flow

Hierarchical Bi2WO6/TiO2-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants

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Product

Resources

About

BiOCl-Coated UiO-66-NH₂ Metal–Organic Framework Nanoparticles for Visible-Light Photocatalytic Cr(VI) Reduction

BiOCl-Coated UiO-66-NH₂ Metal–Organic Framework Nanoparticles for Visible-Light Photocatalytic Cr(VI) Reduction

Hierarchical Bi₂WO₆/TiO₂-nanotube composites derived from natural cellulose for visible-light photocatalytic treatment of pollutants