Preparation of covalent organic framework and adsorption of Congo Red in water
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 2 124.6 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.
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