Preparation Of TiO₂/CB/Coal Tar Pitchspherical Active Carbon And Study On Its Germicidalperformance

Coal tar pitch is a by-product produced during the coking process,and its amount accounts for about 1.5-2.3% of the total dry coal in the furnace.Due to its low price,it has brought a certain negative impact on the economic benefits of the metallurgical and coking industries.In view of the current slump in China's metallurgical and material industries,the preparation of high-end products from cheap and readily available asphalt will be an important way for the coking and metallurgical industries to come out of the trough.TiO₂ can effectively degrade organic matter and bacteria in water,but it has problems such as difficulty in recycling and low catalytic efficiency when used alone.In this study,a carbon black/coal pitch composite spherical activated carbon was prepared by using cheap and readily available coal tar pitch,and TiO₂ was loaded on the surface to prepare a TiO₂ / carbon black/coal pitch composite material,which was applied to the sterilization of koi breeding water.It releases carbon dioxide and water without pollution to the environment and achieves no secondary pollution,leading to that research has important social significance and practical value.In this thesis,carbon black / coal pitch balls were prepared using coal tar pitch and carbon black as raw materials.The ball forming temperature was 85°C,the stirring speed was 300 r / min,the surfactant concentration was 15 g / L,and the amount of carbon black was added.When the content is 0.05 g,a pitch ball with good sphericity and uniform size is prepared,but the introduction of carbon black will increase the roughness of the pitch ball surface.Carbon black / coal pitch ball was prepared by pre-oxidation,carbonization and subsequent activation treatment.Carbon black / coal pitch spherical activated carbons with different specific surface areas were prepared.The experimental results show that the carbonization temperature is 500°C,the activation temperature is 750°C,and KOH: carbon black / coal pitch spherical activated carbon prepared under the condition of CB / PSAC = 3: 1 has a large specific surface area and good sphericity.At the end of the experiment,the TiO₂ / carbon black / coal pitch spherical activated carbon was successfully prepared by the impregnation method.The structure and morphology of the TiO₂ composite were characterized by XRD,BET,SEM and other methods,and its sterilization performance was evaluated.The results showed that the sterilization rate of TiO₂ / carbon black / coal pitch spherical activated carbon reached almost 100% under ultraviolet light irradiation at 365 nm.