The Microwave-Hydrothermal Synthesis And Performance Of Microporous Molecular Sieves Films On Alloy Surpport

The zeolite membrane is prepared on the surface of ceramic,metal or alloy.It is a dense inorganic film formed.Because of zeolite membrane's unique pore structure,molecular size horizontal pore diameter,catalytic-separation integration function,thermal stability,thermal conductivity,hydrophobic,hydrophilicity,corrosion resistance,its is widely used to other areas.It cause for concern about membrane separation,membrane catalysis,corrosion resistance,gas sensitivity,humidity and anti-microbial research.At present,the research mainly focuses on the preparation and application of zeolite-polymer membrane.However,the research on zeolite-molecular film is poor,especially it has just started to study zeolite-molecular film.In this areas,it is satisfic to the requirements of multifunctional integrated material,and it is of great value to study the interfacial properties,film-forming mechanism and crystallization mechanism of molecular sieve porous materials.ZSM-5 molecular sieve film,ZSM-35 zeolite film and NaA / ZSM-5 molecular sieve film were prepared by microwave-hydrothermal method respectively on the surface of aviation aluminum alloy and ZTA ceramics.We study the effects of hydrothermal synthesis and hydrothermal secondary growth on the growth of the films to determine to the great film-forming conditions,so we can obtain a dense continuous molecular sieve film materials.The composition,morphology,corrosion resistance and hydrophilicity of the films were characterized by X-ray diffraction,scanning electron microscopy,elemental analysis,electrochemical test and water contact angle test.The main contents and results are as follows:1.ZSM-5 molecular sieve films with compactness and continuity were prepared on the surface of aluminum alloy sheet and ZTA ceramic by microwave-hydrothermal two-step synthesis method.It studied the effects of Silicalite-? seed concentration,ZSM-5 molecular sieve composition,microwave treatment temperature and hydrothermal crystallization time to determine the optimum film-forming conditions.The results show that the microwave power is 600 W and the temperature is 65 °C for 0.5h,so microwave treatment can significantly shorten the time of ZSM-5zeolite film;The ZSM-5 molecular sieve films under the best film-forming conditions were continuous and compact,with excellent hydrophilicity(average hydrophilicangle of 9 °)and corrosion resistance.2.The microwave-hydrothermal two-step synthesis method was applied to the preparation of ZTA ceramic substrate and Ag + modified ZSM-5 molecular sieve film.The obtained film was continuous,compact and hydrophilic,so it had good biology compatibility.We use the MTT to test the cell viability to more than 95%.We also find it has a strong inhibitory effect to Staphylococcus aureus and Escherichia coli,and within 24 hoursof good continuity.3.The high crystallinity NaA was prepared by microwave synthesis.We prepare the NaA / ZSM-5films by microwave-hydrothermal two-step method and in-situ hydrothermal method.The results show that the microwave-hydrothermal two-step method can shorten the time,but the microwave treatment destroys the NaA structure,resulting in the NaA component loss and reproducibility is poor.The addition of NaA and Silicalite-I seeds on the surface of the aluminum alloy was carried out under the condition of 175 °C for 19 h to NaA / ZSM-5 composite film.Ag+ modified NaA /ZSM-5 composite film have hydrophilic,corrosion resistance and antibacterial properties in the aerospace field has potential applications.4.The continuous and dense layered ZSM-35 zeolite film was prepared on the surface of aluminum alloy by in situ hydrothermal synthesis method.The effects of carrier surface pretreatment,growth mother liquor pretreatment,mother liquor ratio,and hydrothermal treatment were studied.The results show that the hydrothermal pre-crystallization of the growth mother liquor,the pretreatment of the carrier,the pretreatment of the carrier,the coating of the Al2O3 sol-gel transition layer on the aluminum alloy are good for the formation of continuous,dense and highly crystalline layered ZSM-35 film.The ZSM-35 zeolite membrane prepared has a hydrophilic angle of 8.5° and has excellent hydrophilicity and exhibits corrosion resistance in strong acid and even alkali environments.