Synthesis of flower-like heterostructured β-Bi2O3/Bi2O2CO3 microspheres using Bi2O2CO3 self-sacrifice precursor and its visible-light-induced photocatalytic degradation of o-phenylphenol
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- Authors:
- RUIPING HU
XIN XIAO
SHUNHENG TU
XIAOXI ZUO
JUNMIN NAN - Author Affiliations:
- School of Chemistry and Environment. South China Normal University; Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Guangzhou 510006, China
- Source:
- Applied catalysis. B, Environmental. 163:510-519
- Publication Date:
- 2015-01-01
- Language:
- English
- Abstract:
- Novel flower-like heterostructured β-Bi2O3/Bi2O2CO3 microspheres are synthesized by calcining a Bi2O2CO3 self-sacrifice precursor for the visible-light photocatalytic degradation of o-phenylphenol (OPP. is a widely used fungicide and preservative agent). The Bi2O2CO3 microspheres are firstly prepared under hydrothermal conditions, and then converted to Bi2O3 by thermal treatment. With increasing the calcining temperature from 250 to 500 °C, an in situ stepwise decomposition reaction take place during the course of calcination, described as: Bi2O2CO3 → β-Bi2O3/Bi2O2CO3 → β-Bi2O3 → β-Bi2O3/α-Bi2O3 → α-Bi2O3. The β-Bi2O3/Bi2O2CO3 microspheres synthesized at 300 °C exhibit excellent photocatalytic activity under visible-light irradiation, which can degrade 99.8% OPP in 45 min. And the degradation rate of the heterostructured photocatalyst is approximately 2, 2.6, 6, 13, 80, and 827 times higher than that of single P-Bi2O3, mixed β-Bi2O3 and Bi2O2CO3, commercial β-Bi2O3, α-Bi2O3, N-doped TiO2, and Bi2O2CO3, respectively. The superior photoreactivity of the β-Bi2O3/Bi2O2CO3 is attributed to the enhanced charge separation and transfer due to the formation of p-n junction with large heterojunction interface, favorable band gap energy (2.27 eV), relatively high specific surface areas (12.5 m2 g-1), and flower-like hierarchical micro/nano structures. In addition, the degradation intermediates including ethyl phenethyl ether, phenyl acetaldehyde, and phenylacetic acid are identified. And the results also reveal that the photogenerated holes and •O2- radicals are primarily reactive species in the photocatalytic system, which are the key factors responsible for the nearly complete mineralization of OPP.
- Notes:
- General chemistry and physical chemistry
- Subjects:
- General chemistry, physical chemistry
Chimie générale, chimie physique
Environment
Environnement
Sciences exactes et technologie
Exact sciences and technology
Chimie
Chemistry
Chimie generale et chimie physique
General and physical chemistry
Théorie des réactions, cinétique générale. Catalyse. Nomenclature, documentation chimique, informatique chimique
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Catalyse
Catalysis
Physicochimie des réactions induites par rayonnements, particules et ultrasons
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Photochimie
Photochemistry
Etat colloïdal et états dispersés
Colloidal state and disperse state
Etudes physiques et chimiques. Granulométrie. Phénomènes électrocinétiques
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Catalyse hétérogène
Heterogeneous catalysis
Catálisis heterogénea
Dégradation photochimique
Photochemical degradation
Degradación fotoquímica
Microparticule
Microparticle
Micropartícula
Microsphère
Microsphere
Microsfera
Mécanisme
Mechanism
Mecanismo
Oxyde de bismuth
Bismuth oxide
Bismuto óxido
Particule sphérique
Spherical particle
Partícula esférica
Photocatalyse
Photocatalysis
Fotocatálisis
Protection environnement
Environmental protection
Protección medio ambiente
Précurseur
Precursor
Synthèse
Synthesis
Síntesis
Photodegradation mechanism
Visible-light photocatalysis
o-Phenylphenol
p-n junction
β-Bi2O3/Bi2O2CO3 microspheres - Format:
- Academic Journal
- Database:
- PASCAL Archive
- Journal:
- Applied catalysis. B, Environmental
- Volume:
- 163
- Page Start:
- 510
- Page Count:
- 10
- ISSN:
- 09263373
- Publisher:
- Kidlington: Elsevier, 2015.
- Document Type:
- Article
- Physical Description:
- print, 60 ref
