Ultrarapid and Deep Debromination of Tetrabromodiphenyl Ether over Noble-Metal-Free Cu/TiO<sub>2</sub> Nanocomposites under Mild Conditions

Lei, Ming; Guo, Shun; Wang, Zhiying; Zhu, Lihua; Tang, Heqing

doi:10.1021/acs.est.8b03202

Cited by 8 publications

(7 citation statements)

References 41 publications

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“…Therefore, we have to develop alternative methods for achieving complete debromination of PBDEs. Indeed, metal-induced catalytic debromination of PBDEs in the presence of hydrogen sources have been reported recently, − which could be a candidate for the complete debromination of PBDEs.…”

Section: Resultsmentioning

confidence: 99%

Reductive Debromination of Polybrominated Diphenyl Ethers: Dependence on Br Number of the Br-Rich Phenyl Ring

Guo

Zhu

Majima

et al. 2019

Environ. Sci. Technol.

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Reductive debromination has been widely studied for the degradation of polybrominated diphenyl ethers (PBDEs), although the reaction mechanisms are not so clear. In the present study, the photocatalytic degradation and debromination of ten PBDEs were carried out with CuO/ TiO 2 nanocomposites as the photocatalyst under an anaerobic condition. The pseudo-first-order rate constants were obtained for the photocatalytic debromination of PBDEs, and their relative rate constants (k R ) were evaluated against k R = 1 for BDE209. Unlike the generally accepted summary that k R is dependent on the total Br number (N) of PBDEs, k R is found to depend on the Br number on a phenyl ring with more Br atoms than the other one. In other words, a phenyl ring substituted by more Br is more reactive for the reductive debromination. The calculated LUMO energies (E LUMO ) of all PBDEs are well correlated to the more reactive phenyl ring with more Br, compared with the N of two phenyl rings. The result was explained by LUMO localization on the Br-rich phenyl ring, suggesting that the reductive debromination occurs on the phenyl ring.

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Section: Resultsmentioning

confidence: 99%

Reductive Debromination of Polybrominated Diphenyl Ethers: Dependence on Br Number of the Br-Rich Phenyl Ring

Guo

Zhu

Majima

et al. 2019

Environ. Sci. Technol.

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“…In the doping of carbon-based materials, there are few reports on the codoping by both a metal atom and a non-metal atom. We investigated well the N-doped graphene as a Fenton-like catalyst [23], and observed the strong effect of Cu species on the catalytic performances of carbonand non-carbon-based substrates [28][29][30][31]. Furthermore, previous reports suggested that some M−N/C catalysts showed better catalytic activity and stability than those containing only a single metal [5,[31][32][33].…”

Section: Introductionmentioning

confidence: 92%

Copper- and Nitrogen-Codoped Graphene with Versatile Catalytic Performances for Fenton-Like Reactions and Oxygen Reduction Reaction

et al. 2020

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Copper- and nitrogen-codoped reduced graphene oxide material (Cu/N-rGO) was prepared with a hydrothermal method. Its versatile catalytic performances were demonstrated toward the oxidative degradation of rhodamine B (RhB) and oxygen reduction reaction (ORR). The Cu and N codoping of graphene enhanced not only its activation ability toward H2O2, but also its electrocatalytic ability for ORR. It was observed that the use of 3%Cu/N-rGO together with 40 mmol·L−1 H2O2 and 4 mmol·L−1 Na2CO3 could remove more than 94% of the added RhB (30 mg·L−1) in 20 min through a catalytic Fenton-like degradation. Quenching experiments and electron paramagnetic resonance (EPR) measurements indicated that the main reactive species generated in the catalytic oxidation process were surface-bound •OH. The modified graphene also showed good electrocatalytic activity for ORR reaction in alkaline media through a four-electron mechanism. On the electrode of Cu/N-rGO, the ORR reaction exhibited an onset potential of −0.1 V and a half-wave potential of −0.248 V, which were correspondingly close to those on a Pt/C electrode. In comparison with a Pt/C electrode, the 3%Cu/N-rGO electrode showed much greater tolerance to methanol. Such outstanding catalytic properties are attributed to the abundant active sites and the synergism between Cu and N in Cu/N-rGO.

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“…As Figure 2 illustrates, the energy band structure of semiconductor materials is composed of a low energy valence band (VB) full of electrons and an empty high energy conduction band(CB), the area between the low energy valence band and the high energy conduction band is called the forbidden band. [ 45,46 ] TiO 2 is a typical semiconductor with a wide bandgap and has three stable polymorphs‐anatase (E g = 3.2 eV), rutile (E g = 3.02 eV), and brookite (E g = 3.14 eV), so it can only absorb UV light [ 47 ] (about 4% of solar radiation) at wavelengths.…”

Section: Fundamental and Mechanism Of Nanoscale Spherical Tio2 Photocmentioning

confidence: 99%

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications

et al. 2020

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Titanium dioxide (TiO2) has the advantages of strong photocatalytic activity, non‐toxicity, and low cost, and so on. It has always occupied a dominant position in many photocatalytic materials, especially nanoscale spherical TiO2 has the characteristics of high specific surface area and pore‐volume, and so on. Therefore, Degussa P25, as a typical representative of the nanoscale spherical structure, is currently the only material produced on a large scale. According to the structure, nanoscale spherical TiO2 can be divided into three types: solid, core‐shell, and hollow spheres. However, there is still a lack of the latest review on the synthetic doping and application of nanoscale spherical TiO2. Therefore, we first describe the degradation mechanism of nanoscale spherical TiO2 and summarize the latest progress of its synthesis strategy in this review, including doping and other modification techniques, and finally introduce the application of nanoscale spherical TiO2 photocatalytic degradation of volatile organic compounds, dye wastewater, antibiotics, pesticides, and oily wastewater. Through this review, it is helpful for researchers to further understand the synthesis and application of nanoscale spherical TiO2, hoping to continuously improve the disadvantages and photocatalytic activity of nanoscale spherical TiO2, and promote the widespread application of nanoscale spherical TiO2 on an industrial scale.

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Ultrarapid and Deep Debromination of Tetrabromodiphenyl Ether over Noble-Metal-Free Cu/TiO₂ Nanocomposites under Mild Conditions

Cited by 8 publications

References 41 publications

Reductive Debromination of Polybrominated Diphenyl Ethers: Dependence on Br Number of the Br-Rich Phenyl Ring

Reductive Debromination of Polybrominated Diphenyl Ethers: Dependence on Br Number of the Br-Rich Phenyl Ring

Copper- and Nitrogen-Codoped Graphene with Versatile Catalytic Performances for Fenton-Like Reactions and Oxygen Reduction Reaction

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications

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Ultrarapid and Deep Debromination of Tetrabromodiphenyl Ether over Noble-Metal-Free Cu/TiO2 Nanocomposites under Mild Conditions

Cited by 8 publications

References 41 publications

Reductive Debromination of Polybrominated Diphenyl Ethers: Dependence on Br Number of the Br-Rich Phenyl Ring

Reductive Debromination of Polybrominated Diphenyl Ethers: Dependence on Br Number of the Br-Rich Phenyl Ring

Copper- and Nitrogen-Codoped Graphene with Versatile Catalytic Performances for Fenton-Like Reactions and Oxygen Reduction Reaction

Progress on the nanoscale spherical TiO2 photocatalysts: Mechanisms, synthesis and degradation applications

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Product

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Ultrarapid and Deep Debromination of Tetrabromodiphenyl Ether over Noble-Metal-Free Cu/TiO₂ Nanocomposites under Mild Conditions

Progress on the nanoscale spherical TiO₂ photocatalysts: Mechanisms, synthesis and degradation applications