利用水热碳化技术制备了一种莲房基水热炭。通过产物表征、正交实验、吸附等温线、吸附动力学、再生实验等探讨了水热炭在含吡啶废水处理中的应用。结果表明,莲房水热炭具有不同尺寸的孔隙结构,其表面分布着较为丰富的含氧官能团;水热炭吸附吡啶过程中各因素影响顺序为:吡啶初始浓度>水热炭投加量>溶液pH>吸附时间;莲房水热炭对吡啶的吸附动力学符合准二级模型,在35℃与45℃时Freundlich模型可较好地描述吸附等温线规律;25℃时莲房水热炭对吡啶的最大吸附量为31.28 mg/g;磷酸溶液对莲房水热炭的再生效果优于NaOH溶液;莲房水热炭经6次再生后,对吡啶仍具较好的吸附能力。

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.

田晓春(1998-),男,硕士生,研究方向为应用化学,txcgogo@163.com。