磁性碳纳米管吸附/微波再生处理水中五氯苯酚

Magnetic carbon nanotubes adsorption and microwave regeneration for pentachlorophenol

利用热分解法制备了磁性碳纳米管,采用扫描电子显微镜(SEM)、X射线衍射分析仪(XRD)、比表面积分析仪(BET)进行了表征.研究表明,磁性碳纳米管纯度高且孔隙均匀,外径约为50 nm,比表面积为146.7 m2/g;同时加外磁场可以快速其分离.磁性碳纳米管应用于吸附/微波再生处理水中五氯苯酚,结果表明,磁性碳纳米管对五氯苯酚的吸附动力学符合Langergren模型,其平衡吸附量为30.5 mg/g;吸附等温线符合Freundlich模型.吸附饱和磁性碳纳米管经微波再生循环使用5次,再生率均高于100%,且磁性良好.

Magnetic carbon nanotubes（CNTs） were fabricated by thermolysis method. The magnetic CNTs were further characterized by various techniques such as scanning electron microscope（SEM）, X-ray diffraction（XRD） and Brunauer-Emmett-Teller surface measurement（BET）. The characterization results demonstrated that the fabricated magnetic CNTs with high purity and uniform pore size distribution possessed an outside diameter of ca. 50 nm and a surface area of ca. 146.7 m2/g. The magnetic CNTs were subsequently used as adsorbent for sorption removal of pentachlorophenol in aqueous solution, exhibiting superior adsorption performance and easy recycling characteristic by an additional magnetic field. The experimental results indicated that the adsorption kinetic curve of the magnetic CNTs towards pentachlorophenol was accordance with Langergren kinetic adsorption model with an equilibrium adsorption capacity of 30.5 mg/g, and the sorption isotherm fitted very well Freundlich isotherm model. The reusing experiments revealed that after five adsorption and microwave regeneration cycle tests, the regeneration efficiency of the CNTs adsorbent was higher than 100%, moreover, the CNTs adsorbent still maintained well magnetic.