To improve the photocatalytic performance of Co3O4,a Co3O4/g-C3N4 composite photocatalytic material is prepared from ZIF-67 and g-C3N4 through calcining ZIF-67 with MOF template.The structure,properties and elements distribution of the prepared samples are characterized by means of XRD,SEM and FT-IR.The results show that the catalyst exhibits the best photocatalytic performance with a degradation efficiency of 91.1％in 90 min when the concentration of tetracycline hydrochloride is 3 mg·L-1,the dosage of Co3O4/g-C3N4 with a mass ratio of 3％is 15 mg and pH is neutral.The degradation rate can still reach 88.5％after the 3％Co3O4/g-C3N4 composite photocatalyst has been reused for 5 times,indicating a certain photocatalytic stability and reusability.It is verified through system radical capture experiments that three kinds of free radicals including·O2-,h+and·OH are produced,among them·O2-plays a major role in the photocatalytic degradation of tetracycline hydrochloride by Co3O4/g-C3N4.
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