Abstract: In order to remove tetracycline from water,chitin-based hydrothermal char is synthesized as adsorbent.The samples are characterized by XEM,XRD,FT-IR,nitrogen adsorption-desorption isotherms and pore size distributions.Through batch adsorption,qualitative and quantitative analysis,the adsorption characteristics and mechanism of chitin-based hydrothermal char to tetracycline are studied.The results indicate that chitin-based hydrothermal char is rich in active functional groups,such as hydroxyl and carbonyl,and has a lot of pore structures with a specific surface area of 128.58 m2·g-1.The adsorption process of chitin-based hydrothermal char to tetracycline accords with the pseudo-second order kinetic equation and Langmuir model.Thermodynamic analysis shows that the process is a spontaneous endothermic reaction.The maximum adsorption capacity of chitin-based hydrothermal char to tetracycline is 95.60 mg·g-1,and chemical adsorption dominates the adsorption mechanism.
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