title: Highly efficient degradation of dye pollutants by Ce-doped MoO₃ catalyst at room temperature.
abstract: In order to efficiently degrade organic pollutants via an easily operated method, Ce-doped MoO3 (Ce(x)/MoO3) samples are synthesized by a simple impregnation method. The samples are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), nitrogen sorption isotherms and UV-vis diffused reflectance spectra (UV-DRS), total organic carbon (TOC), infrared spectroscopy (IR) and mass spectrometry (MS) analyses. Furthermore, we have mainly investigated the degradation of different dye pollutants by the Ce(x)/MoO3 samples, including cationic methylene blue (MB), anionic methyl orange (MO), neutral phenol, and a MB-MO mixture dye. For the single-component MB and MO dyes, the highest degradation efficiencies are achieved by Ce(5)/MoO3 and Ce(10)/MoO3 samples. For the MB-MO mixture dyes, the highest degradation efficiency for MB is achieved by a Ce(10)/MoO3 sample. It is surprising that the degradation efficiency of MB in the MB-MO mixture dye solution is higher than that in the single-component MB dye solution, which has been mainly ascribed to the promoting effect of MO. Moreover, a plausible degradation mechanism of the dyes has been proposed and discussed. It should be noted that the degradation reaction is carried out at room temperature and normal atmospheric pressure, and without light irradiation. As a result, this degradation reaction is obviously different from the conventional thermally activated heterogeneous catalysis (or photocatalysis), in which thermal energy (or light irradiation) is indispensable; also different from a sorption technology, in which the pollutants cannot be degraded, but only transformed from one phase to another one. Thus, the reported degradation reaction is a quite promising environmental cleaning technology, which could be widely practically applied.
authors.affiliation: Jiangsu Engineering Technology Research Centre of Environmental Cleaning Materials, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Joint Laboratory of Atmospheric Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China. tfwd@163.com.
authors.forename: Yujian
authors.initials: Y
authors.lastname: Jin
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.forename: Haiqiu
authors.initials: H
authors.lastname: Liu
authors.forename: Xia
authors.initials: X
authors.lastname: Hua
authors.forename: Qiuying
authors.initials: Q
authors.lastname: Zhang
authors.forename: Mindong
authors.initials: M
authors.lastname: Chen
authors.forename: Fei
authors.initials: F
authors.lastname: Teng
mesh_terms: D002384:Catalysis; D002563:Cerium / Q000737:chemistry / Q000378:metabolism*; D004396:Coloring Agents / Q000032:analysis / Q000378:metabolism*; D008982:Molybdenum / Q000737:chemistry / Q000378:metabolism*; D010087:Oxides / Q000737:chemistry / Q000378:metabolism*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*; D014961:X-Ray Diffraction
chemical_list: D004396:Coloring Agents; D010087:Oxides; D014874:Water Pollutants, Chemical; C082290:molybdenum trioxide; D002563:Cerium; D008982:Molybdenum