Preparation And Research Of Organic-Inorganic Composite Membrane Induced By Dopamine

Organic-inorganic composite is a power strategy to prepare membranes with high performance and multifunction.Interfacial composite organic-inorganic membrane with high inorganic surface coverage is an ideal type of organic-inorganic membrane as inorganic components can bring their properties into full play.Interfacial intermediate layer which can improve the interfacial compatibility between polymer membranes and inorganic minerals is necessary for the fabrication of stable organicinorganic composite membrane.However,the methods to construct interfacial intermediate layer suffer from the poor universality,uncontrollable mineral morphology and long construct time,limit the development of organic-inorganic composite membrane.Here,we developed a new method to construct interfacial intermediate layer based on dopamine co-deposition which overcame the above drawbacks.The as-prepared membranes were used in battery,photocatalysis,antifouling and oil-water separation.Firstly,inorganic particles were fabricated onto polymer porous substrate via polydopamine/polyethyleneimine coating.We studied the surface morphology variation during fabrication.It is difficult for interfacial intermediate layer to control the surface distribution of inorganic particles.SiO2 composite nonwoven was used as Li-ion battery separator.TiO2 composite microporous membrane owned photocatalysis property with pores blocking,it can be applied to degradation organic dyes.Secondly,inorganic particles were fabricated onto polymer membranes via in-situ growth on polydopamine/polyethyleneimine coating.The obtained organic-inorganic composite membrane is stable due to the strong coordination between polydopamine and metal ions.Surface distribution and size of inorganic particles were controlled by in-situ growth process.TiO2 composite membrane own excellent anti-fouling property.ZrO2 composite membrane is suitable for Li-ion battery separator to enhance the safety performance of battery.Then,we developed dopamine/small-molecular-amine co-deposition method to construct coating.We studied the co-deposition mechanism and properties of codeposition layer.Construction time of dopamine/diethylenetriamine co-deposition layer is short.This co-deposition layer is favor to the fabrication of Ag composite membrane with controllable surface morphology.Ag composite membranes were used as Li-S battery separator.Finally,we develop dopamine/(3-aminopropyl)triethoxysilane co-deposition method for one-step fabrication of SiO2 composite membrane.We studied the codeposition mechanism and surface properties of co-deposition layer.As-prepared organic-inorganic membranes were used in crude oil-water separation.On the other hand,composite free-standing film was obtained during co-deposition.The freestanding films were used in crude oil-water separation and anti-counterfeiting.