Abstract
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.
基金项目
National Natural Science Foundation of China(52225606)
维普
万方数据