In this study,a new type of oxycarbide-based compounds,namely lanthanum titanium oxycarbide and neodymium titanium oxycarbide,were synthesized through solid-state reaction to replace titanium oxycarbide due to its rap...In this study,a new type of oxycarbide-based compounds,namely lanthanum titanium oxycarbide and neodymium titanium oxycarbide,were synthesized through solid-state reaction to replace titanium oxycarbide due to its rapid charge carrier recombination and limited responsiveness to visible light(VL)in photocatalysis.The structural,morphological,optical absorption,and vibrational properties of the synthesized catalysts were thoroughly characterized using powder X-ray diffraction,scanning electron microscopy,ultraviolet-visible spectroscopy,and Fourier transform infrared spectroscopy to assess their suitability for catalytic applications.Subsequently,the photocatalytic behavior of the synthesized materials was evaluated for their ability to degrade the hazardous Congo red(CR)dye in various types of water,including deionized water,domestic utility water used for household purposes,and seawater,under VL illumination.Notably,lanthanum titanium oxycarbide and neodymium titanium oxycarbide exhibited superior degradation efficiencies for CR dye,achieving maximum degradation rates of 87%and 89%,respectively,in domestic water used for routine household purposes within a duration of 90 minutes,when compared to TiOC.However,the degradation efficiency was slightly lower in deionized water and seawater.Additionally,lanthanum titanium oxycarbide and neodymium titanium oxycarbide demonstrated promising hydrogen evolution activity,generating 19.7 and 21.1μmol/g,respectively,under VL in 180 minutes.The enhanced efficiency in CR removal and hydrogen generation activity of lanthanum titanium oxycarbide and neodymium titanium oxycarbide has been attributed to the synergistic effects of improved VL absorption,higher exciton separation and a supportive pH environment due to the presence of lanthanum,neodymium,and carbon ions in a combined entity.展开更多
文摘In this study,a new type of oxycarbide-based compounds,namely lanthanum titanium oxycarbide and neodymium titanium oxycarbide,were synthesized through solid-state reaction to replace titanium oxycarbide due to its rapid charge carrier recombination and limited responsiveness to visible light(VL)in photocatalysis.The structural,morphological,optical absorption,and vibrational properties of the synthesized catalysts were thoroughly characterized using powder X-ray diffraction,scanning electron microscopy,ultraviolet-visible spectroscopy,and Fourier transform infrared spectroscopy to assess their suitability for catalytic applications.Subsequently,the photocatalytic behavior of the synthesized materials was evaluated for their ability to degrade the hazardous Congo red(CR)dye in various types of water,including deionized water,domestic utility water used for household purposes,and seawater,under VL illumination.Notably,lanthanum titanium oxycarbide and neodymium titanium oxycarbide exhibited superior degradation efficiencies for CR dye,achieving maximum degradation rates of 87%and 89%,respectively,in domestic water used for routine household purposes within a duration of 90 minutes,when compared to TiOC.However,the degradation efficiency was slightly lower in deionized water and seawater.Additionally,lanthanum titanium oxycarbide and neodymium titanium oxycarbide demonstrated promising hydrogen evolution activity,generating 19.7 and 21.1μmol/g,respectively,under VL in 180 minutes.The enhanced efficiency in CR removal and hydrogen generation activity of lanthanum titanium oxycarbide and neodymium titanium oxycarbide has been attributed to the synergistic effects of improved VL absorption,higher exciton separation and a supportive pH environment due to the presence of lanthanum,neodymium,and carbon ions in a combined entity.
