含氟共价有机框架的制备及其对酚类污染物的吸附性能OA

A novel fluorine-functionalized covalent organic framework material,PIP-CF3-TFPB COF,was successfully synthesized via the solvothermal method.The structure and morphology of the material were characterized by means of Fourier transform infrared spectroscopy,powder X-ray diffraction,and scanning electron microscopy.The results show that the material possesses high crystallinity and a regular layered stacking structure,with trifluoromethyl groups successfully incorporated into the framework.Using hydroquinone,catechol,resorcinol,phenol,and paracetamol as target pollutants,the effects of adsorbent dosage,initial concentration,and contact time on the adsorption performance were investigated.The results show that the material exhibits excellent adsorption capacity for all five phenolic pollutants,the equilibrium adsorption capacities were 584,527,545,458,437 mg·g-1,respectively.The adsorption process conforms to the pseudo-second-order kinetic model and the Langmuir isotherm model,indicating a monolayer chemical adsorption process.Thermodynamic parameters reveal that the adsorption process is spontaneous and exothermic.Adsorption mechanism studies suggest that hydrogen bonding between the trifluoromethyl groups and phenolic hydroxyl groups,along with π-π stacking interactions within the framework,are the primary driving forces for adsorption.Furthermore,the material demonstrates good recyclability and anti-interference capability in real water samples.The study provides a theoretical basis and technical support for the application of fluorine-functionalized COFs materials in the field of environmental water treatment.