共价有机框架材料的制备及其对水体中刚果红的吸附性能研究

Preparation of covalent organic framework and adsorption of Congo Red in water

为了降低水体中刚果红(CR)的污染水平,采用溶剂法在室温常压下合成了一种巯基修饰的共价有机框架材料(COFs-TFB),以不同的反应条件为考察对象进行吸附实验,研究其吸附CR的性能。通过现代化技术手段对所合成的材料进行表征。实验结果表明,COFs-TFB材料对CR的吸附速度快,适于在酸性条件下进行;COFs-TFB材料对CR的吸附表现出优先选择吸附性,且重复利用性较好;在CR初始浓度为900 mg/L时,对CR的饱和吸附量为2124.6 mg/g;对CR的吸附过程符合准二级动力学模型和Langmuir等温吸附线模型,为单层化学吸附过程。因此,合成的COFs-TFB材料在吸附水体中刚果红领域具有良好的应用前景。

In order to reduce the content of Congo Red(CR)in water,the covalent organic framework material(COFs-TFB)modified with sulfhydryl groups was synthesized in this experiment using a solvent method at room temperature and atmospheric pressure,and adsorption experiments were performed to study its performance in adsorption of CR with adsorption conditions as variables.The synthesized materials were characterized by modern technical means.It was found that the COFs-TFB material was suited for adsorption under acidic conditions.The COFs-TFB material exhibits preferential adsorption.The saturation adsorption amounts of 2124.6 mg/g was reached at the initial concentrations of 900 mg/L for CR.The adsorption process of CR was in accordance with the quasi-secondary kinetic model and Langmuir adsorption isotherm model,which is a monolayer chemisorption process.In summary,the synthesized COFs-TFB materials have good adsorption performance on CR.