Fe3O4 supported on water caltrop-derived biochar toward peroxymonosulfate activation for urea degradation: the key role of sulfate radical

Li, Guang; Cao, Xiaoqiang; Meng, Na; Huang, Yimeng; Wang, Xudong; Gao, Yixiao; Li, Xuan; Yang, Ting-shu; Li, Bo-lai; Zhang, Yizhen; Lyu, Xianjun; Liang, Yue

doi:10.1016/j.cej.2021.133595

Cited by 13 publications

(4 citation statements)

References 54 publications

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“…The intensity ratio (I D / I G ) is typically used to evaluate the degree of defects in samples. 19 The order of the I D /I G values in this study was 3DG/A-MWCNTs (0.98) > 3DG/MWCNTs (0.84) > 3DG (0.79), indicating that doping A-MWCNTs could significantly enhance the defect structure and disorder due to interference from ordered sp 2 hybridization. The increased defect degree of 3DG/A-MWCNTs significantly improves the number of active sites and catalytic activity.…”

Section: Resultsmentioning

confidence: 51%

“…All of the samples exhibited two characteristic peaks, D (1350 cm –1 ) and G (1580 cm –1 ). The intensity ratio ( I D / I G ) is typically used to evaluate the degree of defects in samples . The order of the I D / I G values in this study was 3DG/A-MWCNTs (0.98) > 3DG/MWCNTs (0.84) > 3DG (0.79), indicating that doping A-MWCNTs could significantly enhance the defect structure and disorder due to interference from ordered sp 2 hybridization.…”

Section: Resultsmentioning

confidence: 56%

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A Fixed-Bed Reaction System Packed with a Graphene/Multiwalled Carbon Nanotube Scaffold for the Oxidative Removal of Naproxen

Liu,

et al. 2024

ACS Appl. Nano Mater.

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Most common adsorbents in research reports are powdered two-dimensional carbon materials, including powdered activated carbon and graphene, which tend to be lost during water treatment and cause secondary contamination. In this work, a hydrogel composed of three-dimensional graphene-doped acidified multiwalled carbon nanotubes (3DG/A-MWCNTs) was synthesized. The hydrogels with large specific surface areas and defect structures exhibited outstanding integration, compressive capacity, and negligible loss. The as-obtained material was added to a column as a continuous fixed-bed reactor (FBR). The 3DG/A-MWCNTs packed in the FBR exhibited superior adsorption and peroxymonosulfate (PMS) activation to achieve 56.2% naproxen (NPX) removal efficiency after 1150 min. The operation parameters were systematically optimized including the PMS concentration, initial pH, coexisting anions, bed height, and hydraulic retention time. Significantly, quenching, electron paramagnetic resonance, and electrochemical tests were used to demonstrate that reactive oxygen species (SO 4•− , • OH, O 2 •− , and 1 O 2 ) and electron transfer were involved in NPX degradation. The presence of active sites, oxygen vacancies, electron-rich, oxygen-containing functional groups, and defect structures within 3DG/A-MWCNTs promoted their preeminent catalytic activity. The FBR maintains a removal efficiency of 66.2% for NPX after six repetitions and exhibits excellent purification ability for various pollutants and actual surface water. These results suggest that FBR performs well in practical applications. Overall, this study expands the environmental application of three-dimensional graphene and provides promising metal-free carbon materials for eliminating refractory contaminants in continuous flow mode by using adsorption and PMS-based advanced oxidation processes.

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Section: Resultsmentioning

confidence: 51%

Section: Resultsmentioning

confidence: 56%

A Fixed-Bed Reaction System Packed with a Graphene/Multiwalled Carbon Nanotube Scaffold for the Oxidative Removal of Naproxen

Liu,

et al. 2024

ACS Appl. Nano Mater.

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“…In addition to graphene materials, other carbon-based nanomaterials have been used as negative carrier complexes. Carbon-based nanomaterials, including biochar, porous carbon, activated carbon, and carbon spheres, have been extensively researched because of their high catalytic performance, high availability, low cost, abundant folds on their surfaces, and large specific surface areas, thus providing metal-based materials with abundant binding sites for metal dispersion ( Figure 6 c) [ 177 ]. In addition, heteroatom doping was able to regulate the electron characteristics of primordial sp 2 hybrid carbon, generating new active sites and increasing the specific area (e.g., doping of N) [ 178 ].…”

Section: Nanocomposites (Metal-based Nanomaterials and Carrier)mentioning

confidence: 99%

“…( c ) Schematic illustration of Fe3O4 supported on water caltrop-derived biochar for PMS activation. Reprinted with permission from [ 177 ], Copyright 2020, Elsevier. ( d ) Schematic illustration of g−C 3 N 4 .…”

Section: Figurementioning

confidence: 99%

State-of-the-Art on the Sulfate Radical-Advanced Oxidation Coupled with Nanomaterials: Biological and Environmental Applications

Yang

et al. 2022

JFB

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Sulfate radicals (SO4−) play important biological roles in biomedical and environmental engineering, such as antimicrobial, antitumor, and disinfection. Compared with other common free radicals, it has the advantages of a longer half-life and higher oxidation potential, which could bring unexpected effects. These properties have prompted researchers to make great contributions to biology and environmental engineering by exploiting their properties. Peroxymonosulfate (PMS) and peroxydisulfate (PDS) are the main raw materials for SO4− formation. Due to the remarkable progress in nanotechnology, a large number of nanomaterials have been explored that can efficiently activate PMS/PDS, which have been used to generate SO4−·for biological applications. Based on the superior properties and application potential of SO4−, it is of great significance to review its chemical mechanism, biological effect, and application field. Therefore, in this review, we summarize the latest design of nanomaterials that can effectually activate PMS/PDS to create SO4−, including metal-based nanomaterials, metal-free nanomaterials, and nanocomposites. Furthermore, we discuss the underlying mechanism of the activation of PMS/PDS using these nanomaterials and the application of SO4− in the fields of environmental remediation and biomedicine, liberating the application potential of SO4−. Finally, this review provides the existing problems and prospects of nanomaterials being used to generate SO4−· in the future, providing new ideas and possibilities for the development of biomedicine and environmental remediation.

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Construction of ZnFe2O4/g-C3N4 heterojunction as reusable visible-light photocatalyst and the boosted photocatalytic efficiency by photo-self-Fenton effect for organic pollutant degradation

Xing

Yang

et al. 2023

J Mater Sci: Mater Electron

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Fe3O4 supported on water caltrop-derived biochar toward peroxymonosulfate activation for urea degradation: the key role of sulfate radical

Cited by 13 publications

References 54 publications

A Fixed-Bed Reaction System Packed with a Graphene/Multiwalled Carbon Nanotube Scaffold for the Oxidative Removal of Naproxen

A Fixed-Bed Reaction System Packed with a Graphene/Multiwalled Carbon Nanotube Scaffold for the Oxidative Removal of Naproxen

State-of-the-Art on the Sulfate Radical-Advanced Oxidation Coupled with Nanomaterials: Biological and Environmental Applications

Construction of ZnFe2O4/g-C3N4 heterojunction as reusable visible-light photocatalyst and the boosted photocatalytic efficiency by photo-self-Fenton effect for organic pollutant degradation

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