Preparation and photocatalytic activity of ZnO/TiO{sub 2}/SnO{sub 2} mixture

Journal Article · Tue Nov 15 00:00:00 EST 2005 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2005.09.005· OSTI ID:20784790

Cun, Wang ^[1]; Boqing, Xu ^[1]; Xinming, Wang ^[2]; Jincai, Zhao ^[3]

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1. Innovative Catalysis Program, Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084 (China)
2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640 (China)
3. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080 (China)

ZnO/TiO{sub 2}/SnO{sub 2} mixture was prepared by mixing its component solid oxides ZnO, TiO{sub 2} and SnO{sub 2} in the molar ratio of 4-bar 1-bar 1, followed by calcining the solid mixture at 200-1300 deg. C. The products and solid-state reaction process during the calcinations were characterized with powder X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TG-DTA), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) and Brunauer-Emmett-Teller measurement of specific surface area. Neither solid-state reaction nor change of crystal phase composition took place among the ZnO, TiO{sub 2} and SnO{sub 2} powders on the calcinations up to 600 deg. C. However, formation of the inverse spinel Zn{sub 2}TiO{sub 4} and Zn{sub 2}SnO{sub 4} was detected at 700-900 and 1100-1200 deg. C, respectively. Further increase of the calcination temperature enabled the mixture to form a single-phase solid solution Zn{sub 2}Ti{sub 0.5}Sn{sub 0.5}O{sub 4} with an inverse spinel structure in the space group of O{sub h}{sup 7}-Fd3m. The ZnO/TiO{sub 2}/SnO{sub 2} mixture was photocatalytically active for the degradation of methyl orange in water; its photocatalytic mass activity was 16.4 times that of SnO{sub 2}, 2.0 times that of TiO{sub 2}, and 0.92 times that of ZnO after calcination at 500 deg. C for 2h. But, the mass activity of the mixture decreased with increasing the calcination temperature at above 700 deg. C because of the formation of the photoinactive Zn{sub 2}TiO{sub 4}, Zn{sub 2}SnO{sub 4} and Zn{sub 2}Ti{sub 0.5}Sn{sub 0.5}O{sub 4}. The sample became completely inert for the photocatalysis after prolonged calcination at 1300 deg. C (42h), since all of the active component oxides were reacted to form the solid solution Zn{sub 2}Ti{sub 0.5}Sn{sub 0.5}O{sub 4} with no photocatalytic activity.

• OSTI ID: 20784790
• Journal Information: Journal of Solid State Chemistry, Vol. 178, Issue 11; Other Information: DOI: 10.1016/j.jssc.2005.09.005; PII: S0022-4596(05)00406-8; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALCINATION
CUBIC LATTICES
DIFFERENTIAL THERMAL ANALYSIS
PHOTOCATALYSIS
SOLID SOLUTIONS
SPACE GROUPS
SPINELS
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMAL GRAVIMETRIC ANALYSIS
TIN OXIDES
TITANATES
TITANIUM OXIDES
X-RAY DIFFRACTION
ZINC OXIDES