摘要
【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 significance 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 analysis,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 adsorption/desorption equilibrium at about 180 min.S10-NSC800 exhibits the best effect with the adsorption capacity of 14.424 mg/g.The adsorption data have good correlations with the pseudosecond-order kinetic model.The isothermal adsorption outcome is more consistent with Freundlich 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,andπ-πinteraction.
作者
韦柳益
崔佳丽
崔建国
相里鹏
魏子淇
WEI Liuyi;CUI Jiali;CUI Jianguo;XIANGLI Peng;WEI Ziqi(College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《太原理工大学学报》
CAS
北大核心
2024年第3期550-558,共9页
Journal of Taiyuan University of Technology
基金
山西省自然科学基金资助项目(20210302124083)
山西省大学生创新创业训练计划项目(20220123)
