Carbon Material Modified Polyphenylene Sulfide Film And Its Performance Research

Water resources problem was one of the problems that needed to be solved in today's society.Compared with other water treatment technologies(electrochemical treatment technology,microbial degradation,oxidation treatment,etc.),membrane separation had great advantages such as high efficiency,environmental protection and energy saving,and had become the main treatment method in the field of water treatment.However,in the face of increasingly complex water pollution environment,traditional separation membrane materials PVDF,PES,PAN,etc.,were highly vulnerable to damage and cannot effectively separate polluted water bodies under special conditions.Polyphenylene sulfide(PPS),a special engineering plastic with excellent properties of acid and alkali resistance,high temperature resistance and chemical resistance,could fill the water treatment gap in extreme environments,had attracted more and more attention.Imitating "spider web" structure in the nature,gave full play to the advantage ofmixed matrix membranes(MMMS),research of carbon nanotube(CNT)could be used special tubular structure and performance,as a knitting weaving in PPS membrane cortex layer mesh filter layer,in order to reduce the membrane pore size and increase the rate of entrapment,and excellent properties of PPS.CNT/F127 and CNT@GO were prepared by treating CNT with a poly(ethylene)poly(propylene oxide)block copolymer(Pluronic-F127)and Graphene oxide(GO),respectively.The CNT/F127 and CNT@GO were evenly distributed in the PPS membrane by simple physical blending,and the cortex of "spider web" structure was successfully formed on the membrane surface.The composite membrane exhibited excellent mechanical properties and thermal stability,and its interception rate was improved.More importantly,the simple physical blending modification was suitable for large-scale industrialization of PPS membrane,which promoted the commercialization of PPS membranes.Secondly,pure physical blending modification still had certain limitations.A sandwich structure PPS/NGO/GO composite membrane was prepared by vacuum layer self-assembly method.Nano-GO sheets(NGOs)with multi-scale structures adhered closely to the microporous walls of PPS membranes and filled the micropores to form smooth surfaces.After high temperature treatment,partially reduced NGOs(rNGOs)were closely bound to PPS due to the ?-? conjugate interaction and a small number of S-H bonds between rNGO and PPS matrix.With a small amount of NGO oxygen-containing functional groups and large bonds,large GO plates with different oxygen content were self-assembled layer by layer on the surface of PPS/NGO membrane.The GO filtration layer was rich in oxygen-containing functional groups,which greatly increased the hydrophilicity of the membrane surface,rapidly absorbed water molecules,and thus speeds up the infiltration of water molecules into PPS/rNGO with hydrophobicity.After multi-layer filtration and hydrophilic-hydrophobic layer,the filtration performance and permeability rate of the composite membrane were significantly improved.At the same time,partially reduced GO(rGO)had narrower layer spacing and hydrophobicity,and could be reduced to different degrees according to the size of pollutant molecules.