Highly efficient UV-Vis-infrared catalytic purification of benzene on CeMnxOy/TiO2 nanocomposite, caused by its high thermocatalytic activity and strong absorption in the full solar spectrum region. Issue 25 (9th June 2016)

• Record Type: Journal Article
• Authors: Liu, Huihui; Li, Yuanzhi; Yang, Yi; Mao, Mingyang; Zeng, Min; Lan, Lan; Yun, Li; Zhao, Xiujian
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 25(2016)
• Page Start: 9890
• Page End: 9899
• Publication Date: 2016-06-09
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6ta03181a
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The CeMn x O y /TiO2 nanocomposite exhibits highly efficient catalytic activity for benzene abatement with UV-visible-infrared irradiation. Abstract : The nanocomposite of amorphous cerium manganese oxide supported on nano TiO2 (CeMn x O y /TiO2 ) was prepared by the facile hydrothermal redox reaction of Ce(NO3 )3 and KMnO4 in the presence of nano TiO2 . The CeMn x O y /TiO2 nanocomposite was characterized by XRD, TEM, SEM, EDX, XPS, BET, CO-TPR, and diffusive reflectance UV-Vis-IR absorption. It exhibits efficient thermocatalytic activity for the oxidation of the carcinogenic and recalcitrant benzene, which is comparable to that of the expensive noble metal catalyst (0.5% Pt/Al2 O3 ), and is much higher than the CeO2 /TiO2 and MnO x /TiO2 nanocomposites with the same metal/Ti molar ratio. Its specific CO2 production rate ( r CO2 ) at 220 °C (88.6 μmol g −1 min −1 ) is 6.3 and 7.5 times higher than the nanocomposites of CeO2 /TiO2 and MnO x /TiO2, respectively. The highly efficient thermocatalytic activity of the CeMn x O y /TiO2 nanocomposite is attributed to its higher oxygen activity, compared to the nanocomposites of CeO2 /TiO2 and MnO x /TiO2 . Remarkably, the CeMn x O y /TiO2 nanocomposite can be driven by simulated solar light for benzene oxidation. It exhibits highly efficient catalytic activity with the irradiation of the full solar spectrum, visible-infrared, and infrared light. Its initial CO2 production rate is 117.0, 94.8 and 37.9 μmol g −1 catalyst min −1, under the irradiation of the full solar spectrum, visible-infrared light with wavelength above 420 nm, and infrared light with wavelength above 830 nm, respectively. This is attributed to the fact that the CeMn x O y /TiO2 nanocomposite efficiently transforms the absorbed solar energy into thermal energy, due to its strong absorption in the full solar spectrum region, resulting in a significant increase in its temperature above its light-off temperature, for the thermocatalytic oxidation of benzene.