Preparation And Properties Of Perylene Imide Supramolecular Composite Photocatalytic Materials Of Polyimide

Organic semiconductors are hot materials in the field of photocatalysis at present,among which organic supramolecular has attracted the attention of researchers because of its unique photoelectric properties.Polyimide molecules can interact with perylene diimide(PDI)supramolecular via π-π.Although perylene diimide supramolecular has a wide absorption of near infrared light,its utilization ratio of visible light is low,and the recombination rate of electron holes is high,which affects the photocatalytic performance.In order to solve the above problems,this paperdesigned and synthesized perylene diimide supramolecular composites,exhibited a satisfactory photocatalytic activity and speculated the reasonable photocatalytic mechanism through the relationship between morphology and structure.Organic PDI supramolecular was prepared by solution phase transfer method,and boron nitride quantum dots(BNQDs)that could guide holes were loaded on the surface of PDI supramolecular.The experimental results show that the photocatalytic properties of PDI molecules are improved by adding 10 m L of boron nitride quantum dot solution,and the degradation efficiency of methylene blue and ciprofloxacin is 6.16 times and 1.68 times of that of PDI supramolecular respectively.The reason for the improved performance is that the surface of the BNQDs with negative charge can capture the photogenerated holes of the semiconductor,thus improving the space separation efficiency of the electron holes and improving the photocatalytic performance.PDI-COOH/PDINH(1:1)composite photocatalyst was prepared by solution phase transfer method.The experimental results show that the PDI-COOH/PDINH(1:1)degradation efficiency of methylene blue is the highest,which is 1.62 times and 1.67 times of PDINH and PDI-COOH supramolecular respectively.The reason for the improvement of methylene blue degradation by composite photocatalysts is the existence of charge transfer process which produces holes and superoxide radicals and energy transfer process which produces singlet oxygen.Finally,the photodegradation performance is improved.