Abstract: Blue coke is a kind of high-quality and cheap raw material for activated carbon( AC) production because of its high fixed-carbon content,chemical activity,as well as the rich microporous structure of low metamorphic coal.However,the properties of AC prepared by blue coke powder,such as pore structure irregularity,low surface area,disordered pore size distribution,and limited surface chemical properties,limit its application effect,which can be made up by chemical modification.In this paper,the affection of blue coke-activated carbon( BAC) modified by organic acid inorganic acid on the pore structure and the surface chemical properties was investigated. The BAC was modified by nitric acid,phosphoric acid,oxalic acid and acetic acid respectively. By using iodine adsorbed,cryogenic N2 adsorption techniques,scanning electron microscopy( SEM),and Boehm titration,the properties of BAC were studied,and the adsorption of coking wastewater was carried out.The effects of modification on the adsorption behaviors of coking wastewater onto BACs at different temperatures and amount were researched,and the adsorption isotherms experiment has been studied by Langmuir model and Freundlich model.The results show that the active point with high affinity on the surface of the modified activated carbon is enlarged due to the etching of acid,resulting in the decrease of the iodine adsorption value,specific surface area and pore structure parameter.,And because the high active carbon atoms on the edge of activated carbon will combine with oxygen atoms to form oxygen-containing functional groups after being oxidized by acid,the content of oxygen-containing functional groups on the surface will increase,and the stronger the oxidizing acid is,the more oxygen atoms are,and the oxygen-containing functional groups will increase most obviously after nitric acid modification,and the number is2.41 times as many as unmodified. The adsorption test of coking wastewater shows that the adsorption effect of the acid modified activated carbon on coking wastewater is obviously better than that before modification,among which the inorganic acid is better than the organic acid,and the best adsorption effect can be obtained when the nitric acid modification and the COD removal rate increase to 31. 34%at most.This is because the pollutants in coking wastewater are mainly organic pollutants with large molecular weight and molecular diameter,and the acid modification makes the average pore diameter of the activated carbon based on Lancan increase,and the proportion of the medium and large pore increase,which is conducive to the adsorption of the organic pollutants,and the oxygen-containing functional groups added on the surface of the modified activated carbon also improve the hydrophilicity of the pollutants and the affinity to polar organic matters.The isothermal adsorption test shows that when 4 g BAC-N is added into 50 m L coking wastewater in 90 min at 318 K,the COD removal efficiency reaches to 86.79%,and the adsorption process is in accordance with Langmuir model.