【目的】2,4,6-三氯苯酚(2,4,6-TCP)因其具有强毒性、“三致”效应被列入水中污染物黑名单,处理水中的2,4,6-TCP意义重大。【方法】以市政污泥为原料,采用浸渍-热解法制备得到氮硫共掺杂污泥生物炭(Sx-NSC800),并将其用于吸附水溶液中的2,4,6-TCP;采用扫描电子显微镜、比表面及孔径分析仪、X射线衍射仪、傅立叶红外光谱仪等仪器对Sx-NSC800的结构特征和表面化学性质进行了表征;采用拟一级、拟二级动力学模型拟合了吸附动力学曲线。【结果】Sx-NSC800对2,4,6-TCP有良好的吸附效果,180min左右接近吸附/解吸平衡,其中S10-NSC800效果最好,其吸附量为14.424mg/g;吸附数据与拟二级模型具有良好的相关性;采用经典的等温线模型进行拟合,结果更符合Freundlich等温模型,表明Sx-NSC800对2,4,6-TCP的吸附行为容易发生,升温有利于吸附;同时吸附是一个自发进行且混乱度增加的过程。吸附机制涉及孔隙填充、氢键作用及π-π相互作用。

【Purposes】 2,4,6-Trichlorophenol (2,4,6-TCP) has been listed in the blacklist of pollutants in water because of its strong toxicity and “three inducing” effects. It is of great signif- icance to remove 2,4,6-TCP from water. 【Methods】 Nitrogen and sulfur co-doped sludge biochar (Sx-NSC800) was prepared from municipal sludge by impregnation-pyrolysis method and used to adsorb 2,4,6-TCP in aqueous solution. The structure and surface chemical properties of Sx- NSC800 were characterized by scanning electron microscopy, specific surface and aperture analy- sis, X-ray diffraction, and Fourier infrared spectrometry. The pseudo-first-order kinetic and pseudo-second-order kinetic models were used to fit the adsorption kinetic data. 【Findings】 The results show that Sx-NSC800 has a good adsorption effect on 2,4,6-TCP, and approaches the ad- sorption/desorption equilibrium at about min. S10-NSC800 exhibits the best effect with the adsorption capacity of 14.424 mg/g. The adsorption data have good correlations with the pseudo- second-order kinetic model. The isothermal adsorption outcome is more consistent with Freundli- ch isotherm model, which shows that the adsorption behavior of Sx-NSC800 is easy to take place. Temperature rising is conducive to adsorption. And the adsorption is a spontaneous process with increasing of chaos degree. The adsorption mechanism involves pore filling, hydrogen bonding, and π-π interaction.