Mechanical Force-catalyzed Oxidation Of RhB By Modified ZnO Materials And PVDF Composite Film Characterization

Aiming at the problems of catalytic oxidation stimulated by different mechanical forces and the purification of water environment pollution,the challenges faced from experimental phenomena,basic theories to practical applications.In this paper,ZnO-based composite modified materials are prepared by studying crystals,especially introducing metal Al³⁺,graphene oxide（GO）and polyvinylidene fluoride（PVDF）.Using composite modified materials as new catalysts and RhB as simulated pollutants,the reaction characteristics of catalytic oxidation were investigated by means of ball milling,oscillation,friction,etc.By means of XRD,XPS,Raman and other methods,the related modified materials and enhanced mechanical force were studied.Catalysis,adsorption behavior and analysis of adsorption and catalysis.The main research contents and results are as follows:（1）Al₂O₃,GO-doped ZnO composite nanomaterials were synthesized by a simple mechanochemical method.The introduction of Al³⁺and graphene oxide（GO）improves the electron-hole separation efficiency of ZnO,which is beneficial to the occurrence of mechanocatalytic reactions.Not only the rapid degradation and decolorization of RhB solution was achieved,but the antibacterial experiment also proved that the ball milling process stimulated the action of reactive oxygen radicals such as·OH and·O₂^-,especially the role of·OH as the active species in the experimental system;（2）Zinc-based metal-organic framework（ZIF-8）nanomaterials were prepared by a facile in-situ growth method.Different ratios of ZnO were composited with ZIF-8@GO by mechanosynthesis,that is,ZIF-8@GO replaced Al₂O₃ and GO-doped ZnO composites.The effect of the enhanced adsorption process on the catalytic reaction was investigated,and the results showed that ZnO-ZIF-8@GO showed excellent adsorption performance and catalytic activity under the action of ball milling.The higher the proportion of ZIF-8@GO,the higher the removal efficiency.Relying on the porous structure of ZIF-8 not only strengthened the adsorption of RhB molecules,but also had a strong adsorption effect on metal ions Pb and Cu,but did not show a promotion effect on the excitation of free radicals in the catalytic process.（3）The modified ZnO and PVDF membranes were prepared by non-solvent induced phase separation method for friction-driven catalytic oxidation reaction.The results show that the ZnO-ZIFs nanomaterials are uniformly dispersed in the polymer PVDF,which reflects the synergistic effect of adsorption and mechanocatalysis,and the adsorption effect takes precedence over the catalytic reaction.Comparing different PVDF-ZnO-based catalysts and different mechanical force driving modes,the catalyst has a corresponding relationship with the mechanical force mode.Under suitable conditions,the adsorption and catalytic reactions promote each other and synergize,forming a cyclic strengthening mechanism of adsorption,catalytic oxidation,adsorption and oxidation.