A lotus seedpod hydrochar is prepared through using hydrothermal carbonization.The potential application of hydrochar in the treatment of pyridine-containing wastewater is explored through a series of laboratory studies,including product characterization,orthogonal experiments,adsorption isotherms,adsorption kinetics and regeneration experiment.The results indicate that the lotus seedpod hydrochar has different sizes of pore structures,and distributes abundant oxygen-containing functional groups on its surface.The order of influence of the factors during the adsorption of pyridine by hydrochar is as follows:the initial concentration of pyridine>the amount of hydrochar>pH>contact time.The adsorption of pyridine on the hydrochar accords with the quasi-secondary model,and the adsorption isotherm pattern at 35℃and 45℃ can be better described by the Freundlich model.The maximum adsorption of pyridine on the prepared hydrochar is 31.28 mg·g-1 at 25℃.Regeneration of the saturated lotus seedpod hydrochar by phosphoric acid solution is better than that by NaOH solution.After six cycles of regeneration,the prepared hydrochar still has a strong adsorption capacity for pyridine.
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