Embedding Co in perovskite MoO3 for superior catalytic oxidation of refractory organic pollutants with peroxymonosulfate

Zeng, Qingyi; Tan, Jing; Gao, Beibei; Cai, Tao; Zhang, Qingyan; Liu, Yilin; Chang, Sheng; Zhao, Shuaifei; Wu, Suqing

doi:10.1016/j.chemosphere.2022.137726

Cited by 28 publications

(6 citation statements)

References 35 publications

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“…Figures 2, S2 and S3 show the SEM images of 5% Co doped α-MoO 3 samples, and their corresponding element distribution and element mapping. S1-S5 samples all have the scale-layer rod-like structure, and the particle size is about 1-3 µm [25,26]. Furthermore, with increase of heat treatment temperature, the scale structure and quantity on the surface of the scale-layer rod-like structure gradually increase, but the distance between scales firstly gets narrow and then wide [27].…”

Section: Resultsmentioning

confidence: 98%

“…The peaks centered around 530.0 eV are associated with the lattice oxygen (O L ) and the peaks at around 532.0 eV are attributed to oxygen vacancy (O V ) [30]. The Co doped α-MoO 3 sample is in the thermodynamic state, and some oxygen ions move from the lattice to the grain boundary to maintain bond equilibrium, thus creating oxygen vacancies [26]. The overall charge balance is restored by oxygen loss.…”

Section: Resultsmentioning

confidence: 99%

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The novel Co-doped MoO₃ microwave absorber prepared by heat treatment

Zhang,

Qamar,

Peng

et al. 2023

J. Phys. D: Appl. Phys.

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A Co-doped α-MoO3 microwave absorber was prepared using by heat treatment technology. The oxygen vacancy, conductivity, and electromagnetic parameters of the material could be manipulated by changing the heat treatment temperature, and the microwave absorption mechanism was explored. XRD, Raman, SEM, XPS, and VNA were used to characterize the Co-doped α-MoO3 samples. The orthorhombic phases and scale-layer rod-like structure were observed to favor absorption via multiple transmission paths to EM waves. Notably, the material prepared by heat treatment at 500 °C exhibits a synergistic effect of magnetic and dielectric loss, due to its proper conductivity, rich interfaces and magnetism. The effective absorption bandwidth reaches 2.4 GHz .

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

The novel Co-doped MoO₃ microwave absorber prepared by heat treatment

Zhang,

Qamar,

Peng

et al. 2023

J. Phys. D: Appl. Phys.

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“…Electron paramagnetic resonance (EPR) was further applied to identify the generated ROS, and 5,5-dimethyl-1-pyrroline- N -oxide (DMPO) and 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMP) were used as trapping agents for EPR tests. − As shown in Figure e, no obvious DMPO-•OH DMPO-SO 4 •– and DMPO-O 2 •– signals were detected, which demonstrated that a limited amount of •OH, SO 4 •– , and O 2 •– was generated in the 3D-MNSN-CF/PMS system. − However, a sharp signal of TEMP- 1 O 2 was obviously detected. Based on the results of quenching experiments, it can be concluded that 1 O 2 is the main ROS for oxidizing TC, which means the 3D-MNSN-CF/PMS system possesses a typical nonradical process during the TC degradation. , …”

Section: Resultsmentioning

confidence: 99%

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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“…217 Particularly, PMS with unique structures and chemical properties can be activated efficiently by certain catalysts (Fe-, Co-and Cu-based nanozymes) to produce ROS. [218][219][220][221] These ROS often determine the degradation of organic pollutants. 216,[222][223][224] Huang's group studied the degradation ability of the FeBi-NC + PMS system for rhodamine B (RhB).…”

Section: Degradation Of Organic Dyesmentioning

confidence: 99%

Nanozymes: powerful catalytic materials for environmental pollutant detection and degradation

Diao,

Chen,

Tang

et al. 2024

Environ. Sci.: Nano

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Embedding Co in perovskite MoO3 for superior catalytic oxidation of refractory organic pollutants with peroxymonosulfate

Cited by 28 publications

References 35 publications

The novel Co-doped MoO₃ microwave absorber prepared by heat treatment

The novel Co-doped MoO₃ microwave absorber prepared by heat treatment

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

Nanozymes: powerful catalytic materials for environmental pollutant detection and degradation

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Embedding Co in perovskite MoO3 for superior catalytic oxidation of refractory organic pollutants with peroxymonosulfate

Cited by 28 publications

References 35 publications

The novel Co-doped MoO3 microwave absorber prepared by heat treatment

The novel Co-doped MoO3 microwave absorber prepared by heat treatment

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

Nanozymes: powerful catalytic materials for environmental pollutant detection and degradation

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The novel Co-doped MoO₃ microwave absorber prepared by heat treatment

The novel Co-doped MoO₃ microwave absorber prepared by heat treatment

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