Preparation and Characterization of H₃PW₁₂O₄₀/TiO₂-M (M=Fe, Co, Ni, Zn) and Photocatalytic Activity for Methyl Orange Decomposition

Abstract:

Composites H₃PW₁₂O₄₀/TiO₂-M (M=Fe, Co, Ni, Zn) were synthesized by combining sol-gel technology with impregnation method. The structures and properties were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and UV-Vis diffuser reflectance spectrum (UV-Vis DRS). The XRD and FT-IR results showed that the TiO₂ particles had the anatase phase, and the Keggin structure of H₃PW₁₂O₄₀ remained intact. The UV-Vis DRS results indicated that compared with pure TiO₂, an obvious red shift occurred after introducing H₃PW₁₂O₄₀. The composites were used as heterogeneous photocatalyst to the degradation of methyl orange, and the influences of catalyst dosage, H₃PW₁₂O₄₀ loading and metal ion species were studied. Results show that, under the optimum parameters pH value 2.00, 0.4 g·L^-1 catalyst dosage and 30% H₃PW₁₂O₄₀ loading, 96.6% methyl orange was degraded after 30 min irradiation (365 nm) using composite H₃PW₁₂O₄₀/TiO₂-Zn. The photodegradation process fitted Langmuir-Hinshelwood first order kinetics.

• Periodical: Advanced Materials Research (Volumes 1073-1076)
• Pages: 202-209
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1073-1076.202
• Online since: December 2014
• Authors: Si Jing Chen, Qiang Gan, Hai Ru Shang, Xia Liu*
• Keywords: Methyl Orange, Photocatalytic Degradation, Polyoxometalate, Titanium Dioxide, Transition Metal

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