Preparation Of Doped G-C₃N₄ And Its Application In Photocatalytic Hydrogen Production And Pollutant Degradation

g-C₃N₄has received much attention due to its role in photocatalytic hydrogen evolution and contaminants degradation.However,the bulk phase of carbon nitride（BCN）has many shortcomings,such as poor light absorption capacity,short lifetime of photogenerated electrons and few active sites.In this study,two strategies of element doping and morphology control were used to synergistically enhance its activity.In this study,an energy-saving,low-power white LED lamp（10 W）was used as visible light to carry out the photocatalytic hydrogen evolution reaction,which has great potential in practical applications.In addition,a xenon lamp（300 W）was used as a visible light source to evaluate the performance of the photocatalyst in photocatalytic degradation of organic pollutants.Then,using the green non-toxic ionic liquid BMIPF6 as the P doping source,P doped g-C₃N₄nanosheets were synthesized.P atoms were successfully doped into the framework of g-C₃N₄nanosheets（NCN-P）by forming P-N bonds.The hydrogen production rate of the optimized NCN-P-7 sample under white LED irradiation is3263.99μmol·g^-1·h^-1,which is more than 11.6 times that of BCN.In addition,it also shows a good photocatalytic degradation efficiency of tetracycline,reaching 80%in 1hour（100 mg of photocatalyst is dispersed in 100 ml of tetracycline aqueous solution（30 mg/L））.The optimized NCN-P-7 sample still maintains stable photocatalytic performance after cyclic testing,which makes it have broad application prospects in solar energy utilization and organic pollutant removal.Finally,using melamine dinitrate as the precursor,sodium borohydride as the B source and Na source,and through a combination of controlling the heating rate and thermal post-treatment,the B/Na co-doped porous carbon nitride nanosheets was successfully prepared.Thanks to the synergistic effect of the porous nanosheet structure and B/Na co-doping,the B/Na co-doped porous carbon nitride nanosheets obtained excellent photocatalytic hydrogen evolution performance(5971.51μmol·g^-1·h^-1)),and high-efficiency photocatalytic degradation of TC performance.The photocatalytic degradation efficiency of tetracycline reached 78.39%in 30 minutes（10 mg of photocatalyst was dispersed in 100 ml of tetracycline aqueous solution（30 mg/L））.This provides a new idea for the synthesis of highly efficient semiconductor photocatalysts.