Published November 2014 | Version v1
Journal article Metadata-only

Synthesis of AgBr/Ag4P2O7 composite photocatalyst and enhanced photocatalytic performance

Creators

  • 1. College of Environment and Chemical Engineering and State Key Laboratory of Hollow-Fiber Membrane Materials and Membrane Processes, Tianjin Polytechnic University, No. 399 Binshuixidao Street, Xiqing District, Tianjin 300387 (China)
  • 2. Institute of Composite Materials, Tianjin Polytechnic University, No. 399 Binshuixidao Street, Xiqing District, Tianjin 300387 (China)
  • 3. College of Science, Tianjin University of Science and Technology, No. 29 Shisan Street, Kaifa District, Tianjin 300457 (China)

Description

Highlights: • Ag4P2O7 can be used in photocatalytic degradation of dyes. • AgBr/Ag4P2O7 shows higher activity under visible light irradiation. • The kinetics of activity and enhanced photocatalytic mechanism were analyzed. - Abstract: Ag4P2O7 and AgBr/Ag4P2O7 photocatalysts were synthesized by a simple precipitation reaction, and their structures were characterized by X-ray powder diffraction, scanning electronic microscopy, Brunauer–Emmett–Teller surface area analysis, X-ray photoemission spectroscopy, UV–vis absorption spectroscopy, photoluminescence, and surface photovoltage techniques. Photocatalytic degradations of methylene blue over Ag4P2O7 and AgBr/Ag4P2O7 were also studied under visible light irradiation. AgBr/Ag4P2O7 exhibited excellent photocatalytic efficiency, with the activity higher than that of Ag4P2O7. The band gap and valence band of Ag4P2O7 were 2.67 eV and 1.93 eV, respectively. Ag4P2O7 failed to produce ·OH radicals by directly oxidizing OH− because the oxidation potential of OH− was 2.7 eV. Therefore, electrons excited by light reacted with O2 to produce ·O2− radicals that then formed ·OH radicals. Finally, ·OH radicals oxidized MB molecules. The matching energy bands of Ag4P2O7 and AgBr in the AgBr/Ag4P2O7 heterocatalysts effectively separated the photo-induced charges, which may enhance the photocatalytic activity of Ag4P2O7

Availability note (English)

Available from http://dx.doi.org/10.1016/j.mseb.2014.08.001

Additional details

Identifiers

DOI
10.1016/j.mseb.2014.08.001;
PII
S0921-5107(14)00182-2;

Publishing Information

Journal Title
Materials Science and Engineering. B, Solid-State Materials for Advanced Technology
Journal Volume
189
Journal Page Range
p. 70-75
ISSN
0921-5107
CODEN
MSBTEK

INIS

Country of Publication
Netherlands
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
46090798
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ABSORPTION SPECTROSCOPY; COMPOSITE MATERIALS; ELECTRONS; EV RANGE; HYDROXYL RADICALS; IRRADIATION; METHYLENE BLUE; OXIDATION; PHOTOCATALYSIS; PHOTOELECTRON SPECTROSCOPY; PHOTOLUMINESCENCE; PRECIPITATION; SCANNING ELECTRON MICROSCOPY; SILVER BROMIDES; SILVER PHOSPHATES; SURFACE AREA; SURFACES; SYNTHESIS; VALENCE; X-RAY DIFFRACTION
Descriptors DEC
AMINES; ANTI-INFECTIVE AGENTS; ANTIMICROBIAL AGENTS; AZINES; BROMIDES; BROMINE COMPOUNDS; CATALYSIS; CHEMICAL REACTIONS; CHLORIDES; CHLORINE COMPOUNDS; COHERENT SCATTERING; DIFFRACTION; DRUGS; ELECTRON MICROSCOPY; ELECTRON SPECTROSCOPY; ELEMENTARY PARTICLES; EMISSION; ENERGY RANGE; FERMIONS; HALIDES; HALOGEN COMPOUNDS; HETEROCYCLIC COMPOUNDS; LEPTONS; LUMINESCENCE; MATERIALS; MICROSCOPY; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; ORGANIC SULFUR COMPOUNDS; OXYGEN COMPOUNDS; PHENOTHIAZINES; PHOSPHATES; PHOSPHORUS COMPOUNDS; PHOTON EMISSION; RADICALS; SCATTERING; SEPARATION PROCESSES; SILVER COMPOUNDS; SILVER HALIDES; SPECTROSCOPY; SURFACE PROPERTIES; TRANSITION ELEMENT COMPOUNDS

Optional Information

Copyright
Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.