直接炭化法制备的磁性Co/C吸附剂对罗丹明B的吸附

Adsorption of RB on the magnetic Co/C adsorbent prepared by a direct carbonization

以ZIF-67为前驱体通过直接碳化法合成了具有磁性的Co/C纳米材料,采用X射线衍射仪、全自动比表面及孔隙度分析仪和扫描电子显微镜对所得材料进行结构表征。以罗丹明B溶液模拟印染废水,探究了废水浓度、pH和温度等因素对吸附性能的影响。结果表明:所合成的Co/C在较高的碳化温度(900℃)下形成了,对罗丹明B溶液的吸附降解率可达91%以上,同时吸附过程遵循Langmuir等温吸附模型和准二级动力学模型。

The magnetic Co/C nanocomposites were prepared by a direct carbonization method with ZIF-67as a precursor.The obtained nanocomposites were characterized by several physicochemical techniques,including XRD,BET and SEM.The adsorption activity was evaluated by the degradation of Rhodamine B(RB)solution,and the influence of wastewater concentration,pH and temperature on the adsorption activity were investigated.The synthesized Co/C at high carbonization temperature(900℃)had an ordered carbon nanotube-like structure and magnetic Co nanoparticles with good crystalinity,and theses had a large specific surface area.The adsorptive degradation rate of RB solution can reach more than 91%.The adsorption processes fit well to Langmuir isotherm model and second-order kinetic model.