Efficient Fenton-like process for organic pollutant degradation on Cu-doped mesoporous polyimide nanocomposites

Lyu, Lai; Han, Muen; Cao, Wenrui; Gao, Yaowen; Qing-yuan, Zeng; Yu, Guangfei; Huang, Xuan; Hu, Chun

doi:10.1039/c8en01365a

Cited by 48 publications

(24 citation statements)

References 32 publications

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“…Better cycle stability and a wider range of pH applications were observed for the prepared composites (Table S3). − Therefore, the above findings show outstanding activity and reusability of the as-prepared CDs/g-C 3 N 4 /Cu x O.…”

Section: Resultsmentioning

confidence: 77%

Effect of pH on the Catalytic Degradation of Rhodamine B by Synthesized CDs/g-C₃N₄/Cu_xO Composites

et al. 2021

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The narrow pH range of Fenton oxidation restricts its applicability in water pollution treatment. In this work, a CDs/g-C 3 N 4 / Cu x O composite was synthesized via a stepwise thermal polymerization method using melamine, citric acid, and Cu 2 O. Adding H 2 O 2 to form a heterogeneous Fenton system can degrade Rhodamine B (Rh B) under dark conditions. The synthesized composite was characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and N 2 adsorption/desorption isotherms. The results showed that CDs, Cu 2 O, and CuO were successfully loaded on the surface of g-C 3 N 4 . By evaluating the catalytic activity on Rh B degradation in the presence of H 2 O 2 , the optimal contents of citric acid and Cu 2 O were 3 and 2.8%, respectively. In contrast to a typical Fenton reaction, which is favored in acidic conditions, the catalytic degradation of Rh B showed a strong pH-dependent relation when the pH is raised from 3 to 11, with the removal from 45 to 96%. Moreover, the recyclability of the composite was evaluated by the removal ratio of Rhodamine B (Rh B) after each cycle. Interestingly, recyclability is also favored in alkaline conditions and shows the best performance at pH 10, with the removal ratio of Rh B kept at 95% even after eight cycles. Through free radical trapping experiments and electron spin resonance (ESR) analysis, the hydroxyl radical ( • OH) and the superoxide radical ( • O 2 − ) were identified as the main reactive species. Overall, a mechanism is proposed, explaining that the higher catalytic performance in the basic solution is due to the dominating surface reaction and favored in alkaline conditions.

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Section: Resultsmentioning

confidence: 77%

Effect of pH on the Catalytic Degradation of Rhodamine B by Synthesized CDs/g-C₃N₄/Cu_xO Composites

et al. 2021

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“…Our former research on the Cu-based heterogeneous Fenton-like systems has shown that these problems could be overcome by forming dual reaction centers (DRCs) on the surface of catalysts through cation-π interactions. − It was found that H 2 O 2 could be mainly reduced to •OH in the electron-rich centers, while pollutants and their intermediate products could be adsorbed and complexed on the electron-poor centers with their electrons being transferred to electron-rich centers, realizing the redox reaction involving the two centers and the substantial degradation of pollutants. The proposed DRC process has also been recently confirmed by some research groups. − However, the construction of the cation-π structure to induce DRCs often relies on complex catalyst synthetic processes (the synthesis of inorganic support materials, the doping of metal species and the coordination/complexation of surface carbon materials) and requires a high level of support structure.…”

Section: Introductionmentioning

confidence: 99%

Efficient Fenton-like Process for Pollutant Removal in Electron-Rich/Poor Reaction Sites Induced by Surface Oxygen Vacancy over Cobalt–Zinc Oxides

Zhan

Zhang

et al. 2020

Environ. Sci. Technol.

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To achieve high efficiency and low consumption for water treatment in the Fenton reaction, we use the surface oxygen vacancies (OVs) as the electron temporary residences to construct a dual-reaction-center (RDC) Fenton-like catalyst with abundant surface electron-rich/poor areas consisting of OV-rich Co-ZnO microparticles (OV-CoZnO MPs). The lattice-doping of Co into ZnO wurtzite results in the formation of OVs with unpaired electrons (electron-rich OVs) and electron-deficient Co3+ sites according to the structural and electronic characterizations. Both experimental and theoretical calculations prove that the electron-rich OVs are responsible for the capture and reduction of H2O2 to generate hydroxyl radicals, which quickly degrades pollutants, while a large amount of pollutants are adsorbed at the electron-deficient Co3+ sites and act as electron donors for the system, accompanied by their own oxidative degradation. The electrons obtained from the pollutants in the electron-deficient sites are transferred to the OVs through the internal bond bridge to achieve the balance of electron gain/loss. Through this process, pollutants are efficiently converted and degraded by multiple pathways in a wide range of pH (4.5–9.5). The reaction rate of the OV-CoZnO MPs/H2O2 system is increased by ∼17 times compared with the non-DRC system. This discovery provides a sustainable strategy for pollutant utilization, which shows new implications for solving the troublesome issues of the Fenton reaction and for developing novel environmental remediation technologies.

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“…Furthermore, the precursor of PI can be transformed into aqueous solution by facile chemical modification. [28][29][30] The special complexation may be easier to achieve before Fe and N-containing substrates.…”

Section: Introductionmentioning

confidence: 99%

The interaction of surface electron distribution-polarized Fe/polyimide hybrid nanosheets with organic pollutants driving a sustainable Fenton-like process

et al. 2020

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Efficient Fenton-like process for organic pollutant degradation on Cu-doped mesoporous polyimide nanocomposites

Abstract: Dual reaction centers are formed between C–O–Cu bonding bridges of Cu-MP NCs owing to cation–π interactions. H2O2 is reduced to ˙OH on electron-rich Cu centers, while pollutants are degraded on electron-deficient centers.

Cited by 48 publications

References 32 publications

Effect of pH on the Catalytic Degradation of Rhodamine B by Synthesized CDs/g-C₃N₄/Cu_xO Composites

Effect of pH on the Catalytic Degradation of Rhodamine B by Synthesized CDs/g-C₃N₄/Cu_xO Composites

Efficient Fenton-like Process for Pollutant Removal in Electron-Rich/Poor Reaction Sites Induced by Surface Oxygen Vacancy over Cobalt–Zinc Oxides

The interaction of surface electron distribution-polarized Fe/polyimide hybrid nanosheets with organic pollutants driving a sustainable Fenton-like process

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Efficient Fenton-like process for organic pollutant degradation on Cu-doped mesoporous polyimide nanocomposites

Abstract: Dual reaction centers are formed between C–O–Cu bonding bridges of Cu-MP NCs owing to cation–π interactions. H2O2 is reduced to ˙OH on electron-rich Cu centers, while pollutants are degraded on electron-deficient centers.

Cited by 48 publications

References 32 publications

Effect of pH on the Catalytic Degradation of Rhodamine B by Synthesized CDs/g-C3N4/CuxO Composites

Effect of pH on the Catalytic Degradation of Rhodamine B by Synthesized CDs/g-C3N4/CuxO Composites

Efficient Fenton-like Process for Pollutant Removal in Electron-Rich/Poor Reaction Sites Induced by Surface Oxygen Vacancy over Cobalt–Zinc Oxides

The interaction of surface electron distribution-polarized Fe/polyimide hybrid nanosheets with organic pollutants driving a sustainable Fenton-like process

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Effect of pH on the Catalytic Degradation of Rhodamine B by Synthesized CDs/g-C₃N₄/Cu_xO Composites

Effect of pH on the Catalytic Degradation of Rhodamine B by Synthesized CDs/g-C₃N₄/Cu_xO Composites