Preparation And Application Of Polyphenylene Sulfide Ultrafine Fiber Composites Modified By Metal-organic Frameworks

With the development of science and technology and the improvement of people's living standards,functional fibers have become the trend of the textile industry.The development of new functional fiber is one of the hot topics in today's textile technology.Polyphenylene sulfide?PPS?fiber,as a high-performance fiber material,has excellent thermal stability,chemical stability,flame resistance,and good electrical insulation.PPS fiber fabrics and related products are widely used in high-temperature filtration,electrical insulation,and functional clothing.In addition,metal-organic frameworks?MOFs?have rich nano-scale pore structures,high porosity,and large specific surface area.They have been widely applied in the fields of adsorption,separation,catalysis,and fluorescence detection.Therefore,the application of MOFs in the field of fibers to develop new functional fibers has a very broad application prospect.In this paper,we prepare PPS-based MOFs composites by hydrothermal synthesis?PPS-ZIF-8?and biomimetic mineralization?ALD-PPS/Eu-MOF?.The effects of MOFs loading on the microstructure,physical and chemical properties of the composites were investigated.The adsorption of simulated nuclide iodine by PPS-ZIF-8 composite membrane and the fluorescent properties of the ALD-PPS/Eu-MOF paper based sensor to different heavy metal ions and organic solvents were also investigated.The specific research contents are as follows:?1?Preparation and adsorption performance of ZIF-8/PPS composite materials:PPS ultrafine fiber modified by chitosan was used as substrate to prepare two novel composite membrane via hydrothermal?PPS-ZIF-8?and biomimetic mineralization?PPS-ZIF-8-BSA?approaches.The biomimetic mineralization approach in particular was extremely rapid and mild,and crystalline ZIF-8 was coated on the PPS substrate in only several seconds at room temperature.The two materials have considerably different morphology under SEM.The adsorption,interception and cycling performance of iodine by composites under different ZIF-8 loadings were systematically studied.The results show that the ZIF-8/PPS and ZIF-8/PPS-BSA composites have the best adsorption capacity for iodine vapor when the ZIF-8?BSA?content is 20%,reaching 2.51g/g and 2.07g/g respectively.In addition,the iodine vapor interception efficiency and recycling rate of the composite material under this content can reach 99.0%and 93.3%,respectively.?2?Fabrication of ALD-PPS/Eu-MOF paper-based sensor:Atomic deposition?ALD?technique was used to deposit a thin TiO₂ layer on the surface of PPS ultrafine fibers.ALD could be used to produce very thin and uniform thin film TiO₂ with controllable thickness at the atomic level.ALD-PPS/Eu-MOF paper based sensor was prepared by in-situ growth of MOFs by hydrothermal method.The influence of hydrothermal conditions on the growth of MOFs was studied.The structure and properties of the ALD-PPS/Eu-MOF paper-based sensor were characterized and tested by SEM,XRD and FTIR,and the detection and recognition of metal ions and solvents were also tested.The experimental results showed that the quenching effect of ALD-PPS/Eu-MOF paper-based sensor on Fe³⁺was significantly stronger than that of other metal ions(K⁺,Cd²⁺,Ca²⁺,Pb²⁺,Na⁺,Zn²⁺,Mg²⁺,and Co²⁺),and the fluorescence intensity of the detector decreased significantly with the increase of Fe³⁺concentration.In addition,ALD-PPS/Eu-MOF paper-based sensor has significantly stronger quenching effect on acetone than other organic solvents?for example,N-butanol,ethyl acetate,ethanol,chloroform,methanol,N-hexane,N,N-dimethylformamide,tetrahydrofuran,dichloromethane and hexanitrile?.