Oxygen vacancies-rich α@δ-MnO2 mediated activation of peroxymonosulfate for the degradation of CIP: The role of electron transfer process on the surface

Zhu, Shijun; Li, Haojie; Wang, Lei; Cai, Zhiyue; Wang, Qiao; Shen, Songtu; Li, Xueyan; Deng, Jing

doi:10.1016/j.cej.2023.141415

Cited by 50 publications

(10 citation statements)

References 64 publications

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“…No obvious diffraction peaks of MnO 2 were observed for 3D-MNSN-CF(5), which could be partially attributed to relatively low coating amount of MnO 2 and partially ascribed to the porous structure of CF sheets and round property of CF. A typical diffraction peak at 12.3° corresponding to the (110) crystal plane of δ-MnO 2 was observed for the 3D-MNSN-CF( X ) ( X = 20, 40, and 50), and the intensity was increased along with the increasing amount of KMnO 4 . Small peaks at 24.6° and 38.6° corresponding to the (221) and (060) planes of δ-MnO 2 were also detected for 3D-MNSN-CF( X ) ( X = 40 and 50) .…”

Section: Resultsmentioning

confidence: 97%

“…A typical diffraction peak at 12.3° corresponding to the (110) crystal plane of δ-MnO 2 was observed for the 3D-MNSN-CF( X ) ( X = 20, 40, and 50), and the intensity was increased along with the increasing amount of KMnO 4 . Small peaks at 24.6° and 38.6° corresponding to the (221) and (060) planes of δ-MnO 2 were also detected for 3D-MNSN-CF( X ) ( X = 40 and 50) . This result further demonstrated the successful decoration of δ-MnO 2 on the CF.…”

Section: Resultsmentioning

confidence: 97%

“…Small peaks at 24.6°and 38.6°corresponding to the (221) and (060) planes of δ-MnO 2 were also detected for 3D-MNSN-CF(X) (X = 40 and 50). 22 This result further demonstrated the successful decoration of δ-MnO 2 on the CF. Based on the result of inductively coupled plasma mass spectrometry, the mass ratios of MnO 2 were about 0.32, 1.13, 2.16, and 2.31% (Table S1) for the 3D-MNSN-CF(X) (X = 5, 20, 40, and 50), respectively.…”

Section: Characterization Of 3d-mnsn-cfmentioning

confidence: 99%

“…Yu and co-workers showed that Mn 3+ -rich δ-MnO 2 achieved a high removal rate of Bisphenol A (BPA) even at low dosages, as Mn 3+ substitution in δ-MnO 2 promoted PMS activation. Additionally, layered δ-MnO 2 is prone to the formation of oxygen vacancies (O V s) on its surface, which enhance the catalytic performance by accepting and donating free electrons during the reaction. , For instance, Deng and co-workers synthesized O V s-rich α@δ-MnO 2 with a low crystalline structure for the catalytic degradation of ciprofloxacin (CIP). This material acted as a shuttle for electron transport from CIP to PMS.…”

Section: Introductionmentioning

confidence: 99%

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MnO₂ Nanosheet Nets on Carbon Fiber as Fixed Catalysts for a Highly Efficient, Nonradical Fenton-like Process in Wastewater Refractory Pollutant Treatment

Zhang

et al. 2023

ACS Appl. Nano Mater.

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The development of highly efficient fixed catalysts is a significant concern in practical wastewater treatment using the peroxymonosulfate (PMS)-based Fenton-like process. In this study, we successfully synthesized a three-dimensional (3D) δ-MnO 2 nanosheet (MNSN) net grown on a carbon-fiber (CF) sheet (3D-MNSN-CF) through a simple hydrothermal strategy. This novel catalyst demonstrated exceptional efficiency and stability in activating PMS for degrading refractory organics. The 3D-MNSN-CF catalyst was composed of wrinkled, ultrathin δ-MnO 2 nanosheets (∼4.3 nm) grown on CF, forming a uniform 3D net structure with a covering thickness of approximately 7.6 μm (mass ratio ∼ 2.17%). This unique morphology provided a fixed Mn-based catalyst with a highly exposed (001) facet, intrinsic Mn 3+ /Mn 4+ redox pair, and a high ratio of oxygen vacancies (O V s). These features enabled the 3D-MNSN-CF/PMS system to exhibit a remarkable removal ratio of approximately 100% for tetracycline hydrochloride (TC) degradation. The system also showed a high rate constant (k value) of approximately 0.15 min −1 and a specific activity (ε) of 3.46 L min −1 g −1 based on the MnO 2 ratio, surpassing many reported Mn-based catalysts. Moreover, the 3D-MNSN-CF catalyst maintained excellent performance over a wide pH range from 2 to 11. Furthermore, we discovered that electron-rich oxygen-containing groups exhibited an inhibition effect by competing adsorption with PMS, hindering the generation of radicals. Additionally, the results indicated that singlet oxygen ( 1 O 2 ) was the main reactive species responsible for TC removal, while only a small amount of radicals contributed to the process. The catalyst's excellent performance was also demonstrated in treating various refractory organics and real wastewater, and it exhibited splendid stability for recycling use.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Section: Characterization Of 3d-mnsn-cfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

MnO₂ Nanosheet Nets on Carbon Fiber as Fixed Catalysts for a Highly Efficient, Nonradical Fenton-like Process in Wastewater Refractory Pollutant Treatment

Zhang

et al. 2023

ACS Appl. Nano Mater.

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“…Tetracycline hydrochloride (TC-HCl) and ciprofloxacin (CIP) are broad-spectrum antibiotics that have been used in medicine for many years. , However, TC-HCl and CIP had high stability and low biodegradability, making complete metabolic decomposition difficult and posing a significant threat to the ecological environment and human health. − Therefore, the simple and effective removal of antibiotics was indeed critical. Semiconductor photocatalysis appears to be a promising technology due to its high efficiency, safety, and nonpollution.…”

Section: Introductionmentioning

confidence: 99%

Thickness Modification of BiOBr Nanosheets by Sn-TiO₂ for Enhanced Photocatalytic Degradation of Antibiotics

Ying

Xie

et al. 2023

ACS Appl. Nano Mater.

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Modification of morphological engineering to enhance photocatalytic activity has been considered an effective strategy. However, effective modification of the catalyst nanosheet thickness remains a difficult challenge to control. Here, we have synthesized Sn-TiO 2 /BiOBr composite photocatalysts by a onepot method. With the addition of Sn-TiO 2 , the flakes of BiOBr gradually became thinner, resulting in more surface reaction site, and Sn-TiO 2 clearly increased the adsorption capacity of the composite catalyst. The degradation efficiency of the prepared Sn-TiO 2 /BiOBr (the atomic ratio of titanium/bismuth 1:1) was 98% and 80% for TC-HCl and CIP, respectively, showing good photocatalytic performance. Furthermore, the radical trapping experiments revealed that h + and •O 2 − play an important role in the Sn-TiO 2 /BiOBr system. Photoelectrochemical tests and photoluminescence confirm that the thin sheets can significantly improve carrier migration efficiency in Sn-TiO 2 /BiOBr heterojunctions. Finally, the degradation mechanism of the Sn-TiO 2 /BiOBr system was elucidated using UV-DRs and Mott−Schottky curves. Experimental analysis shows that modulating the thickness of BiOBr nanosheets with Sn-TiO 2 can promote the exposure of surface reaction sites, can enhance their light adsorption ability and carrier mobility, and is a promising method for improving photocatalytic efficiency.

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Boosting Zn²⁺ Intercalation in High‐Performance Aqueous Zinc‐Ion Batteries with Coupling‐Induced Biphase Interface

Lu,

Chen,

Orenstein

et al. 2024

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Effectively addressing the trade‐off between fast charging kinetics and long cycle life of aqueous zinc ion batteries (AZIBs) has proven challenging due to JahnTeller distortion and high lattice strain induced by inserted Zn2+ ions in cathode structures. Herein, a hybrid cathode of NiCo2O4‐MnO2 with abundant electrochemical phase interfaces and interface coupling induced defects is developed via a simple electrochemical oxidation strategy to boost rich redox reactions. The formation of Ni─O─Mn and Co─O─Mn bonds promoted the electron transfer between the biphase interface, adjusted the electron density of the material body, effectively alleviated the electrostatic effect between Zn2+ embedding and the main frame, and further maintained the stability of the structure and alleviated the dissolution of manganese. The resulting NiCo2O4‐MnO2 cathode exhibited a high reversible specific capacity of 343.5 mA h g−1 at a current density of 100 mA g−1 and retained 95.5 % of its initial capacity after 1000 cycles at a current density of 1 A g−1. This discovery enriches insights into performance mechanisms at interfaces and paves the way for designing advanced energy storage materials.

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Oxygen vacancies-rich α@δ-MnO2 mediated activation of peroxymonosulfate for the degradation of CIP: The role of electron transfer process on the surface

Cited by 50 publications

References 64 publications

MnO₂ Nanosheet Nets on Carbon Fiber as Fixed Catalysts for a Highly Efficient, Nonradical Fenton-like Process in Wastewater Refractory Pollutant Treatment

MnO₂ Nanosheet Nets on Carbon Fiber as Fixed Catalysts for a Highly Efficient, Nonradical Fenton-like Process in Wastewater Refractory Pollutant Treatment

Thickness Modification of BiOBr Nanosheets by Sn-TiO₂ for Enhanced Photocatalytic Degradation of Antibiotics

Boosting Zn²⁺ Intercalation in High‐Performance Aqueous Zinc‐Ion Batteries with Coupling‐Induced Biphase Interface

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Oxygen vacancies-rich α@δ-MnO2 mediated activation of peroxymonosulfate for the degradation of CIP: The role of electron transfer process on the surface

Cited by 50 publications

References 64 publications

MnO2 Nanosheet Nets on Carbon Fiber as Fixed Catalysts for a Highly Efficient, Nonradical Fenton-like Process in Wastewater Refractory Pollutant Treatment

MnO2 Nanosheet Nets on Carbon Fiber as Fixed Catalysts for a Highly Efficient, Nonradical Fenton-like Process in Wastewater Refractory Pollutant Treatment

Thickness Modification of BiOBr Nanosheets by Sn-TiO2 for Enhanced Photocatalytic Degradation of Antibiotics

Boosting Zn2+ Intercalation in High‐Performance Aqueous Zinc‐Ion Batteries with Coupling‐Induced Biphase Interface

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Product

Resources

About

MnO₂ Nanosheet Nets on Carbon Fiber as Fixed Catalysts for a Highly Efficient, Nonradical Fenton-like Process in Wastewater Refractory Pollutant Treatment

MnO₂ Nanosheet Nets on Carbon Fiber as Fixed Catalysts for a Highly Efficient, Nonradical Fenton-like Process in Wastewater Refractory Pollutant Treatment

Thickness Modification of BiOBr Nanosheets by Sn-TiO₂ for Enhanced Photocatalytic Degradation of Antibiotics

Boosting Zn²⁺ Intercalation in High‐Performance Aqueous Zinc‐Ion Batteries with Coupling‐Induced Biphase Interface