Preparation And Properties Of ZnO-Based Porous Materials

Porous material refers to a large number of interconnected or closed porous materials in the interior.Due to the porous character of materials,they exhibit a lot of excellent properties with specific high surface area and strong adsorption performance.Based on the above-mentioned properties,porous materials have attracted a wide range of research interests in the fields of catalysis,adsorption and separation.Among them,porous silicon-based materials and zeolitic imidazolate framework materials have attracted great attention because of good thermal stability and chemical stability.The main research work of this paper are list as follow:(1)By using the double template method(PAA and P123 in ethanol system),the hollow mesoporous SiO2 was obtained through hydrolyzed reaction of tetraethyl orthosilicate under alkaline conditions And then the hollow mesoporous SiO2 was loaded with ZnO to obtain ZnO@SiO2 catalyst through the method of impregnation.the catalytic degradation performance of the material was studied.At pH = 5,the degradation of methylene blue reached 98.6%,and the degradation rate of 5 cycles was kept at 61.5%.(2)Hollow ZnO microspheres were synthesized by hydrothermal method by using zinc nitrate hexahydrate and 2-methylimidazole as raw materials.ZnO microspheres were used to provide zinc source and ZnO@ZIF-8 microsphere composites were synthesized.The dispersibility of ZnO microspheres which is synthesized by hydrothermal method is better,the size of microspheres is relatively uniform,and the center of microspheres is hollow structure.the synthesized ZnO@ZIF-8 microspheres adsorb uranyl in an acidic environment,which is the best.When the pH was 4,the maximum adsorption of uranyl reached 145.24 mg/g,and the material was stable in an acidic environment with pH greater than 2.(3)Using stainless steel mesh and carbon fiber cloth as substrate materials,zinc nitrate and dimethyl imidazole as raw materials,a secondary growth method was used to successfully grow ZIF-8 films on the substrate material.The SEM,PXRD and other characterization methods were used to characterize the synthesized materials.The concentration of zinc nitrate solution was explored for the growth of ZnO lines,and the dense ZIF-8 film was grown on the best ZnO lines.