The invention provides a preparation method and application of a near-
infrared absorption electropositive
carbon nitride nano-composite PEISECCNs, and relates to the technical field of biological medicines.The preparation method comprises the following steps that a
nitrogen-containing precursor and a
selenium-containing precursor are calcined under
nitrogen protection to obtain a mixture, and the mixture is placed in mixed acid to react to obtain-COOH-SeCCNs modified by-COOH groups; and dissolving the obtained-COOH group modified COOH-SeCCNs and a branched chain PEI600, HOBT, HBTU and N, N-diisopropylethylamine in DMF (
Dimethyl Formamide), carrying out an
acylation reaction, and dialyzing to obtain a final product PEISeCCNs. The invention constructs the electropositive
carbon nitride-based nano-composite PEISECCNs capable of absorbing near-
infrared light, and the electropositive
carbon nitride-based nano-composite PEISECCNs has good
biocompatibility, is beneficial to application in the field of
biomedicine, and can absorb near-
infrared light. The carbon
nitride-based nano-composite PEISeCCNs disclosed by the invention is mainly synthesized by high-temperature
calcination, acidification and
acylation reaction. The synthesis method is simple, good in
repeatability and easy for industrial production, and is a brand-new
hybrid compound.