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Magnetically separable CdFe 2 O 4 /graphene catalyst and its enhanced photocatalytic properties

A magnetically separable CdFe 2 O 4 /graphene (CdFe 2 O 4 /GR) photocatalyst was prepared using a one-step hydrothermal method. The photocatalytic activity was evaluated by photocatalytic oxidation of methylene blue (MB) under visible-light irradiation. Its photocatalytic activity was improved signi... Full description

Journal Title: Journal of Materials Chemistry A 2015, Vol.3(7), pp.3576-3585
Main Author: Zhang, Danfeng
Other Authors: Wang, Qiong , Wang, Lingling , Zhang, Lei
Format: Electronic Article Electronic Article
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ID: DOI: 10.1039/c4ta05419a
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recordid: rscc4ta05419a
title: Magnetically separable CdFe 2 O 4 /graphene catalyst and its enhanced photocatalytic properties
format: Article
creator:
  • Zhang, Danfeng
  • Wang, Qiong
  • Wang, Lingling
  • Zhang, Lei
subjects:
  • Photo-Degradation
  • Photocatalytic-Oxidation
  • Deactivation
  • Mineralisation
  • Engine-Power
  • Separating
  • Carbonates
  • Nitrates
  • Sulfates
  • Phosphate
  • Photocatalysts
  • Graphene
  • Anions
  • Band-Structure
  • Electrons
  • Organic-Pollutant
  • Photodegradation
  • Photokatalytische Oxidation
  • Deaktivierung
  • Mineralisierung
  • Nutzleistung
  • Separation
  • Carbonat
  • Nitrat
  • Sulfat
  • Phosphat
  • Photokatalysator
  • Graphen
  • Anion
  • Bandstruktur
  • Elektron
  • Organischer Schmutzstoff
  • Engineering
ispartof: Journal of Materials Chemistry A, 2015, Vol.3(7), pp.3576-3585
description: A magnetically separable CdFe 2 O 4 /graphene (CdFe 2 O 4 /GR) photocatalyst was prepared using a one-step hydrothermal method. The photocatalytic activity was evaluated by photocatalytic oxidation of methylene blue (MB) under visible-light irradiation. Its photocatalytic activity was improved significantly by introducing graphene into CdFe 2 O 4 . The first-order kinetic constant of degradation with CdFe 2 O 4 /GR (0.00543 min 1 ) was 5 times that with CdFe 2 O 4 (0.00145 min 1 ). The photocatalytic deactivation was investigated in the presence of individual anions (nitrate, sulfate, carbonate, and phosphate). Among the anionic species studied, carbonate exhibited the promotion effect, but others did not considerably affect the photo-degradation process. The mineralization products of MB were detected using High Performance Liquid Chromatography (HPLC) and ion chromatography. Several scavengers, the band structure obtained from UV-Vis diffuse reflectance spectrum, as well as MottSchottky measurement, were used to identify the roles of active species in the degradation process. The active species, i.e. holes and hydroxyl radicals, play major roles in the photo-degradation of MB. Note that the fundamental mechanism based on photo-degradation is discussed in detail, and the enhanced photocatalytic performance of CdFe 2 O 4 /GR was attributed to the improved electronhole pair separation efficiency. The CdFe 2 O 4 /GR showed good stability after four cycles and could be easily separated by a magnet and reused, showing great potential for environmental purification of organic pollutants.
language:
source:
identifier: DOI: 10.1039/c4ta05419a
fulltext: fulltext
issn:
  • 2050-7488
  • 2050-7496
  • 20507496
  • 20507488
url: Link


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titleMagnetically separable CdFe 2 O 4 /graphene catalyst and its enhanced photocatalytic properties
creatorZhang, Danfeng ; Wang, Qiong ; Wang, Lingling ; Zhang, Lei
ispartofJournal of Materials Chemistry A, 2015, Vol.3(7), pp.3576-3585
identifierDOI: 10.1039/c4ta05419a
descriptionA magnetically separable CdFe 2 O 4 /graphene (CdFe 2 O 4 /GR) photocatalyst was prepared using a one-step hydrothermal method. The photocatalytic activity was evaluated by photocatalytic oxidation of methylene blue (MB) under visible-light irradiation. Its photocatalytic activity was improved significantly by introducing graphene into CdFe 2 O 4 . The first-order kinetic constant of degradation with CdFe 2 O 4 /GR (0.00543 min 1 ) was 5 times that with CdFe 2 O 4 (0.00145 min 1 ). The photocatalytic deactivation was investigated in the presence of individual anions (nitrate, sulfate, carbonate, and phosphate). Among the anionic species studied, carbonate exhibited the promotion effect, but others did not considerably affect the photo-degradation process. The mineralization products of MB were detected using High Performance Liquid Chromatography (HPLC) and ion chromatography. Several scavengers, the band structure obtained from UV-Vis diffuse reflectance spectrum, as well as MottSchottky measurement, were used to identify the roles of active species in the degradation process. The active species, i.e. holes and hydroxyl radicals, play major roles in the photo-degradation of MB. Note that the fundamental mechanism based on photo-degradation is discussed in detail, and the enhanced photocatalytic performance of CdFe 2 O 4 /GR was attributed to the improved electronhole pair separation efficiency. The CdFe 2 O 4 /GR showed good stability after four cycles and could be easily separated by a magnet and reused, showing great potential for environmental purification of organic pollutants.
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subjectPhoto-Degradation ; Photocatalytic-Oxidation ; Deactivation ; Mineralisation ; Engine-Power ; Separating ; Carbonates ; Nitrates ; Sulfates ; Phosphate ; Photocatalysts ; Graphene ; Anions ; Band-Structure ; Electrons ; Organic-Pollutant ; Photodegradation ; Photokatalytische Oxidation ; Deaktivierung ; Mineralisierung ; Nutzleistung ; Separation ; Carbonat ; Nitrat ; Sulfat ; Phosphat ; Photokatalysator ; Graphen ; Anion ; Bandstruktur ; Elektron ; Organischer Schmutzstoff ; Engineering;
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descriptionA magnetically separable CdFe 2 O 4 /graphene (CdFe 2 O 4 /GR) photocatalyst was prepared using a one-step hydrothermal method. The photocatalytic activity was evaluated by photocatalytic oxidation of methylene blue (MB) under visible-light irradiation. Its photocatalytic activity was improved significantly by introducing graphene into CdFe 2 O 4 . The first-order kinetic constant of degradation with CdFe 2 O 4 /GR (0.00543 min 1 ) was 5 times that with CdFe 2 O 4 (0.00145 min 1 ). The photocatalytic deactivation was investigated in the presence of individual anions (nitrate, sulfate, carbonate, and phosphate). Among the anionic species studied, carbonate exhibited the promotion effect, but others did not considerably affect the photo-degradation process. The mineralization products of MB were detected using High Performance Liquid Chromatography (HPLC) and ion chromatography. Several scavengers, the band structure obtained from UV-Vis diffuse reflectance spectrum, as well as MottSchottky measurement, were used to identify the roles of active species in the degradation process. The active species, i.e. holes and hydroxyl radicals, play major roles in the photo-degradation of MB. Note that the fundamental mechanism based on photo-degradation is discussed in detail, and the enhanced photocatalytic performance of CdFe 2 O 4 /GR was attributed to the improved electronhole pair separation efficiency. The CdFe 2 O 4 /GR showed good stability after four cycles and could be easily separated by a magnet and reused, showing great potential for environmental purification of organic pollutants.
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abstractA magnetically separable CdFe 2 O 4 /graphene (CdFe 2 O 4 /GR) photocatalyst was prepared using a one-step hydrothermal method. The photocatalytic activity was evaluated by photocatalytic oxidation of methylene blue (MB) under visible-light irradiation. Its photocatalytic activity was improved significantly by introducing graphene into CdFe 2 O 4 . The first-order kinetic constant of degradation with CdFe 2 O 4 /GR (0.00543 min 1 ) was 5 times that with CdFe 2 O 4 (0.00145 min 1 ). The photocatalytic deactivation was investigated in the presence of individual anions (nitrate, sulfate, carbonate, and phosphate). Among the anionic species studied, carbonate exhibited the promotion effect, but others did not considerably affect the photo-degradation process. The mineralization products of MB were detected using High Performance Liquid Chromatography (HPLC) and ion chromatography. Several scavengers, the band structure obtained from UV-Vis diffuse reflectance spectrum, as well as MottSchottky measurement, were used to identify the roles of active species in the degradation process. The active species, i.e. holes and hydroxyl radicals, play major roles in the photo-degradation of MB. Note that the fundamental mechanism based on photo-degradation is discussed in detail, and the enhanced photocatalytic performance of CdFe 2 O 4 /GR was attributed to the improved electronhole pair separation efficiency. The CdFe 2 O 4 /GR showed good stability after four cycles and could be easily separated by a magnet and reused, showing great potential for environmental purification of organic pollutants.
doi10.1039/c4ta05419a
pages3576-3585