Advances in research of the modification of graphitic carbon nitride based photocatalysts
Photocatalysts can convert solar energy into chemical energy and show great potential for applications in pollutant degradation,hydrogen production by water photolysis,and CO2 reduction.As one of the new photocatalysts,graphitic carbon nitride(g-C3N4)has many excellent properties,low preparation cost,adjustable optical band gap,excellent chemical and physical stability,etc.,which have attracted a lot of attention from researchers.However,the unmodified g-C3N4 suffers from small specific surface area,insufficient active sites for reaction,low quantum efficiency and high complexation rate of photogenerated charge carriers,which limit the application of g-C3N4 in photocatalysis.Therefore,the existing g-C3N4 photocatalysts are modified to improve their photocatalytic performance.Combined with the remarkable results achieved so far in carbon nitride modification treatment,the authors review the main methods for modification of graphite-phase carbon nitride composites,including elemental doping,defect engineering,design of various nanostructures and construction of heterojunctions,and make an outlook on the development trend of g-C3N4 in photocatalysis for reference.
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