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In comparison with photocatalytic process, the catalytic degradation of organic dye pollutants in no need of light irradiation is highly interesting from the energy-saving point of view. In this paper, we developed a new CeGeO 4 catalyst that can satisfy the energy-saving requirements in this regard. During the synthesis of CeGeO 4 , the influence of synthetic medium pH, the kind of precursor, etc., on the formation of crystalline CeGeO 4 was investigated in detail. Importantly, the CeGeO 4 catalyst exhibited significantly higher performance than that of CeGeO 4 /CeO 2 or CeO 2 in degradation of rhodamine B (RhB) or methylene blue (MB) in the dark at room temperature. [ABSTRACT FROM AUTHOR]

Developing efficient catalysts capable of degrading organic dye free of light irradiation is highly interesting from the energy-saving point of view. In this work, we prepared a new Ce(IO 3 ) 4 catalyst by a facile precipitation method. The obtained Ce(IO 3 ) 4 sample showed remarkably superior performance to the reported CeGeO 4 analog in degradation of rhodamine B (RhB), methyl orange (MO) or methylene blue (MB) dyes in the dark at room temperature. The ultraviolet-visible (UV–vis) absorption spectra of dye solution during degradation, the XPS results of Ce(IO 3 ) 4 and the control experiments confirmed that the dye degradation is a catalytic process. The reusability of it was also investigated in the degradation experiments. [ABSTRACT FROM AUTHOR]

Development of visible-light-responsive photocatalyst is significantly important in treatment of environmental pollution with sustainable solar energy. In this paper, a new visible-light-responsive photocatalyst, HgSe, was successfully prepared by a simple hydrothermal method. The HgSe photocatalyst showed higher photocatalytic activity than that of Degussa P25 (commercial TiO 2 ) in degradation of rhodamine B (RhB) and methyl orange (MO) dyes under irradiation of visible light. The active species of HgSe for the RhB degradation are found to be photogenerated holes and superoxide anion radicals. The HgSe photocatalyst can be reused for at least three cycles without obvious loss of its activity in degradation of RhB. [ABSTRACT FROM AUTHOR]