Preparation Of V₂O₅/Spherical Activated Carbon Derived From Coal Tar Pitch And Evaluation On Its Germicidal Performance

China is the country who has the huge outputs of coal tar pitch.However,the low price and low utilization rate restrict the developments of coal tar pitch.It is well-known that pitch based spherical activated carbon（SAC）prepared from coal tar pitch has the advantages of high mechanical strength,low impurity content,large specific surface area,high packing density,large adsorption capacity and fast adsorption and desorption rate.The wide usages in catalyst and drug carrier,electrochemical energy storage,desulfurization,denitrification,water treatment and so on,endow coal tar pitch with high additional value.As a kind of photocatalysts,V₂O₅ can effectively degrade organic matter in water,but it has some problems such as difficult recovery and low catalytic efficiency when it is used alone.In order to improve the water purification effect,coal tar pitch based SAC and nano-sized V₂O₅were used to prepare V₂O₅/coal tar pitch based composite SAC,which was applied to sterilize treatment of aquaculture water.This not only overcomes the problems which occur when only using the SAC and V₂O₅,but also plays their respective advantages through the synergistic effect.Therefore,the research has certain social significance and practical value.In this paper,pitch based SAC was prepared from coal tar pitch.The effects of pitch content,stirring time,KNO₃addition and heating rate on the SAC were investigated.Secondly,V₂O₅nanorods were prepared by hydrothermal method using commercial micro V₂O₅ powder as raw material,and the effects of hydrothermal temperature,hydrothermal time and calcination temperature on the properties were investigated.Finally,V₂O₅/coal tar pitch based SAC with excellent performance was prepared by impregnation method and electrostatic adsorption method with self-made coal tar pitch based SAC and V₂O₅nanorods as raw materials,and their bactericidal properties to bacteria in aquaculture water were investigated respectively.The results show that:when the dosage of coal tar pitch is 1 g,the stirring time is20 min,the mass ratio of KNO₃ to ball is 2:1,and the heating rate is 0.5℃/min,the SAC based on coal tar pitch having good sphericity,uniform size and large specific surface area is prepared.When the hydrothermal temperature is 180℃,the hydrothermal time is 24 h,and the calcination temperature is 400℃,the morphology of V₂O₅ nanorods is the best.Compared with V₂O₅/coal tar pitch based SAC prepared by impregnation method,V₂O₅/coal tar pitch based SAC prepared by electrostatic adsorption method can significantly inhibit the dissolution of V₂O₅ in water,and its bactericidal effect is also significantly improved.