Preparation,Characterization And Catalytic Performance For O-Dichlorobenzene Degradation Of Nanocellulose/Covalent Organic Framework(COF) Composites

To solve the problem of difficulty to shape and further processing of covalent organic framework?COF?powder materials.This paper combined nanocellulose?NFC and CNC?with COF materials to design and prepare two types of high-quality COF composite material,i.e.,COF/NFC composite membrane and COF-CMC/CNC hybrid aerogel,which successfully realized the processing of COF material deviceization.Besides,The COF composite materials used as a carrier for the Pd catalyst exhibited excellent catalytic activity for the degradation of o-DCB;meanwhile a simple and rapid in situ MHE-GC method for evaluating the catalytic performance of COF composites was established.A layer of COF thin film was successfully grown on the NFC substrate modified by APTES with the method of solvothermal,and a tailorable COF/NFC composite membrane was obtained.The results show that the resultant COF/NFC composite membrane with good crystallization and high orientation has a smooth and flawless surface.We also doped Pd nanoparticles into COF/NFC composite membrane by liquid phase reduction method.The product was used to catalyze the reductive dechlorination of o-DCB and achieved fine results.For the first time,COF materials and CNC were combined into a flexible and porous aerogel with layered structure by elaborately constructed sol-gel method.The COF-CMC/CNC hybrid aerogel have thin-walled 3D porous structure and excellent mechanical stability and flexibility.It can be applied in various fields benefited from the advantages of high crystallinity,uniform distribution porosity and high thermal stability.We used it as a carrier for Pd catalysts to exhibit extremely high catalytic activity and stability.An in-situ headspace gas chromatography method for evaluating catalyst performance was established based on MHE theory?in-situ MHE-GC?.This method is accurate,rapid,simple and reliable,which greatly improved the efficiency of catalyst evaluation.Besides,this method was not limited by the type of catalyst and the complex sample matrix,making it possible to degrade and detect the substance simultaneously.The accuracy,reproducibility and reliability of the method were verified by parallel tests and comparison with UV multi-wavelength methods.The method was applied to evaluate the effect of COF-CMC/CNC hybrid aerogel and COF/NFC composite membrane as catalyst carriers.The results showed that both catalysts exhibited excellent catalytic performance with apparent rate constants of 0.0223 min^-1 and0.0235 min^-1,respectively.