Adsorption Mechanism of Antibiotic by Sludge Based Ceramsite with Core-Shell Structure
With the continuous development of urbanization,the disposal of residual sludge in sewage treatment plants has become serious,which has the characteristics of loose structure,large porosity,large specific surface area.A core-shell structure sludge based ceramsite particle was prepared by using the sludge as the main matrix,montmorillonite as the binder and fly ash as the auxiliary agent.The adsorption performance of sludge ceramsite was tested by tetracycline hydrochloride solution.The results showed that when the content of montmorillonite was 20%,the core of sludge ceramsite had loose macroporous structure,and the shell had dense microporous structure.It had rich pore structures with a specific surface area of 49160 cm2/g.The maximum adsorption capacity of sludge ceramsite to tetracycline hydrochloride was 7.95 mg/g.The adsorption process followed the pseudo-second-order kinetic model and Freundlich isothermal adsorption model.SEM and EDS showed that the core-shell structure of sludge ceramsites mainly depended on the large pore structure of the core,which provided sufficient adsorption space.The microporous structure of the shell played a role in diffusion,and the microporous structure provided pore channels for tetracycline hydrochloride diffusion.
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