首页|A direct polymeric carbon nitride/tungsten oxide Z-scheme heterostructure for efficient photocatalytic hydrogen generation via reforming of plastics into value-added chemicals
A direct polymeric carbon nitride/tungsten oxide Z-scheme heterostructure for efficient photocatalytic hydrogen generation via reforming of plastics into value-added chemicals
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To promote charge transfer and separation for efficient photocatalysis,a direct Z-scheme heterostructure was constructed by coupling polymeric carbon nitride(PCN)and WO3.Interestingly,the obtained PCN/WO3 Z-scheme heterostructure could photocatalytically produce hydrogen and value-added chemicals(e.g.,formate and acetate)by reforming of plastic polylactic acid(PLA)in alkaline aqueous condition.By optimizing WO3 contents and reaction conditions,the obtained PCN/WO3 heterostructure exhibits much increased photocatalytic activity for PLA photoreforming under visible light,with hydrogen evolution rate reaching 402.90 pmol·g-1·h-1,which is 3.5 times that of PCN.It is revealed that the Z-scheme charge transfer between PCN and WO3 mainly contributes to the promoted charge separation and thus the improved photocatalytic activity.Moreover,with h+and·OH experimentally evidenced as the predominant active species,a possible reaction pathway for the reforming of PLA into value-added chemicals(e.g.,formate and acetate)over PCN/WO3 Z-scheme heterostructure is cleared by monitoring the reaction intermediates and radicals.This work paves a carbon neutrality and scalable route toward the synergistical production of hydrogen and value-added chemicals by utilizing and recycling plastic waste.
International Research Center for Renewable Energy,State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China
School of Civil and Architecture Engineering,Xi'an Technological University,Xi'an 710021,China
Department of Mechanical Engineering,University of California at Berkeley,Berkeley,CA 94720,USA
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