▎ 摘　　要

NOVELTY - Quinoxaline-based conjugated microporous polymer grafted graphene material (I) is new. USE - (I) is useful in preparing photoelectrochemical sensor for detecting rifampicin (all claimed). ADVANTAGE - (I): is used in detection method of rifampicin: has simple operation, miniaturized device, low cost, rapid detection, and high-sensitivity identification. DETAILED DESCRIPTION - Quinoxaline-based conjugated microporous polymer grafted graphene material of formula (I) is new. INDEPENDENT CLAIMS are also included for: Preparation of (I); Photoelectrochemical sensor, where the sensor is obtained by modifying quinoxaline-based conjugated microporous polymer grafted graphene material on the conductive surface of the indium tin oxide electrode; Preparing photoelectrochemical sensor by using quinoxaline-based conjugated microporous polymer grafted graphene material, comprising ultrasonically cleaning indium tin oxide electrode in acetone, ethanol and distilled water in sequence, and drying under an infrared lamp for later use, ultrasonic dispersing of quinoxaline-based conjugated microporous polymer grafted graphene material in N,N-dimethylformamide to form dispersion, pipetting the dispersion liquid and dropping on the conductive surface of the indium tin oxide electrode to prepare quinoxaline-based conjugated microporous polymer grafted graphene material modified electrode, and drying at room temperature; and Detecting rifampicin by using photoelectrochemical sensor, comprising (1) preparing different concentrations of rifampicin standard solutions by taking phosphate buffered saline as electrolyte, taking quinoxaline-based conjugated microporous polymer grafted graphene material modified electrode as the working electrode, taking the calomel electrode as the reference electrode, taking platinum electrode as the auxiliary electrode to form three-electrode system, adding rifampicin standard solution in electrolytic solution, adopting chronoamperometry to detect the rifampicin standard solution of different concentrations, and thus drawing the linear relationship between the logarithm of photoelectric current and rifampicin concentration, and (2) adopting the standard addition method to detect the concentration of rifampicin in the sample to be tested in the phosphate buffer solution, and determining the content of rifampicin in the sample based on the linear relationship between step (1) gained photocurrent and concentration.