Photoinduced charge property of nanosized perovskite-type LaFeO{sub 3} and its relationships with photocatalytic activity under visible irradiation

Journal Article · Thu Feb 15 00:00:00 EST 2007 · Materials Research Bulletin

OSTI ID:21000584

Shudan, Li ^[1]; Liqiang, Jing ^[1]; Wei, Fu ^[1]; Libin, Yang ^[1]; Baifu, Xin ^[1]; Honggang, Fu ^[1]

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1. Laboratory of Physical Chemistry, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080 (China)

In this paper, ABO{sub 3}-type perovskite LaFeO{sub 3} nanosized photocatalysts were synthesized by a sol-gel method, using citric acid (HOOCCH{sub 2}C(OH)(COOH)CH{sub 2}COOH) as complexing reagent and La(NO{sub 3}){sub 3}.6H{sub 2}O and Fe (NO{sub 3}){sub 3}.9H{sub 2}O as raw materials. The as-prepared samples also were characterized by several testing techniques, such as thermogravimetry-differential thermal analysis (TG-DTA), X-ray powder diffraction (XRD), Brunauer-Emmett-Teller (BET), infrared spectrum (IR), ultraviolet-visible diffuse reflection spectrum (UV-vis DRS), photoluminescence spectrum (PL), surface photovoltage spectroscopy (SPS) and electrical field induced surface photovoltage spectroscopy (EFISPS). The sample activity of different LaFeO{sub 3} nanoparticles for degrading Rhodamine B solution under visible irradiation ({lambda} > 400 nm) was evaluated. The effects of thermal treatment temperature on photoinduced charge property and photocatalytic activity were mainly investigated, together with their relationships. The results show that the LaFeO{sub 3} sample calcined at 500 deg. C exhibits higher activity, and the activity decreases with increasing calcination temperature, which is in good agreement with the characterization results. The weaker is the PL and SPS signal, the higher is the photocatalytic activity. Moreover, the activity of all as-prepared LaFeO{sub 3} samples is higher than that of international P-25 TiO{sub 2} under visible irradiation.

• OSTI ID: 21000584
• Journal Information: Materials Research Bulletin, Vol. 42, Issue 2; Other Information: DOI: 10.1016/j.materresbull.2006.06.010; PII: S0025-5408(06)00251-0; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCINATION
DIFFERENTIAL THERMAL ANALYSIS
ELECTRIC FIELDS
HEAT TREATMENTS
INFRARED SPECTRA
IRRADIATION
NANOSTRUCTURES
NITRATES
NITROGEN OXIDES
PEROVSKITE
PHOTOCATALYSIS
PHOTOLUMINESCENCE
RAW MATERIALS
SOL-GEL PROCESS
SPECTROSCOPY
THERMAL GRAVIMETRIC ANALYSIS
TITANIUM OXIDES
ULTRAVIOLET RADIATION
X-RAY DIFFRACTION