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The invention discloses an S-type heterojunction photocatalyst of FMO (at) F and M-ZIS as well as a preparation method and application of the S-type heterojunction photocatalyst. According to the invention, the S-type heterojunction photocatalyst of Fe and Mo co-doped ZnIn2S4 coated FeMoO4 (FMO (at) F and M-ZIS) can be prepared without using a template agent and a surfactant. The catalyst can take tetracycline hydrochloride as a pollutant (40 ppm), the degradation efficiency of the catalyst can reach 100% under a 10 W LED lamp for 20 min, and the degradation rates of high performance liquid chromatography and three-dimensional fluorescence detection are 100% and 97.4% respectively.

This application discloses a method for preparing a graphene / carbon nanotube composite slurry and its application, relating to the field of electrochemical sensing. The method includes: S1, placing multi-walled carbon nanotubes in concentrated sulfuric acid, reacting, washing with deionized water until neutral, and drying to obtain carboxylated carbon nanotubes; S2, adding the carboxylated carbon nanotubes to thionyl chloride, stirring the reaction, rinsing with tetrahydrofuran, and drying to obtain acyl chloride-based carbon nanotubes; S3, mixing the following components: 4.0-6.0% multi-walled carbon nanotubes, graphene microsheets... 0.2-1.0%, dispersant 0.5-1.0%, melamine 3.0-6.0%, balance NMP; S4, add graphene oxide / carbon nanotube filter material to dilute hydrochloric acid solution for acid washing and purge with nitrogen bubbles, stir evenly, filter, dry, and repeat 4 times. Mix and disperse each component in N-methylpyrrolidone to improve the uniformity of the mixture. Carbon nanotubes and graphene microsheets are uniformly dispersed in NMP to reduce the possibility of agglomeration and break up the already agglomerated groups.