Composite membrane and preparing method and application thereof
A composite membrane and carbon composite technology, which is applied in the field of ion separation, can solve the problems of poor chemical resistance, short life, and limit the development of thin-film reverse osmosis technology, and achieve the goal of increasing the range of absorption wavelengths, improving utilization efficiency, and high mechanical properties. Effect
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Embodiment 1
[0025] Embodiment 1: the preparation of composite film
[0026] 1) uniformly mix the aqueous solution of graphene oxide, the aqueous solution of ZnS and the aqueous solution of nano titanium oxide; The volume concentration is 5mg / L; the mass ratio of graphene oxide and nano-titanium oxide is 1:0.15, and the mass ratio of ZnS and nano-titanium oxide is 1:0.6;
[0027] 2) Based on the PP microporous filter membrane with an average pore size of 2.1 microns, the mixture solution of graphene oxide, ZnS and nano-titanium oxide is dehydrated under negative pressure by vacuum filtration method, and then interacted on the microporous filter membrane substrate. Stacking self-assembly into a carbon-containing composite layer; during the suction filtration process, another layer of PP microporous filter membrane with an average pore size of 8.6 microns is coated on the carbon-containing composite layer to form a composite membrane with a sandwich structure;
[0028] 3) drying the sandwic...
Embodiment 2
[0032] Embodiment 2: the preparation of composite film
[0033] 1) The aqueous solution of graphene oxide, the aqueous solution of ZnS and the aqueous solution of nano-titanium oxide are uniformly mixed; The aqueous solution mass volume concentration of graphene oxide is 5mg / L, the mass volume concentration of nano-titanium oxide aqueous solution is 5mg / L, the aqueous solution mass concentration of ZnS The volume concentration is 10 mg / L; the mass ratio of graphene oxide and nano-titanium oxide is 1:0.2, and the mass ratio of ZnS and nano-titanium oxide is 1:0.8;
[0034] 2) With a PE microporous membrane with an average pore size of 12.5 microns as the substrate, the mixture solution of graphene oxide, ZnS and nano-titanium oxide is dehydrated under negative pressure by vacuum filtration, and then the mixture solution on the microporous membrane substrate is mutually Stacking self-assembly into a carbon-containing composite layer; during the suction filtration process, anothe...
Embodiment 3
[0039] Embodiment 3: the preparation of composite film
[0040] 1) The aqueous solution of graphene oxide, the aqueous solution of ZnS and the aqueous solution of nano-titanium oxide are uniformly mixed; The aqueous solution mass volume concentration of graphene oxide is 25mg / L, the mass volume concentration of nano-titanium oxide aqueous solution is 20mg / L, the aqueous solution mass concentration of ZnS The volume concentration is 20mg / L; the mass ratio of graphene oxide and nano-titanium oxide is 1:0.2, and the mass ratio of ZnS and nano-titanium oxide is 1:1;
[0041] 2) Based on the alumina porous membrane with an average pore size of 0.22 microns, the mixture solution of graphene oxide, ZnS and nano-titanium oxide is dehydrated under negative pressure by vacuum filtration, and then stacked on the microporous membrane substrate Self-assembled into a carbon-containing composite layer; during the suction filtration process, another layer of PP microporous filter membrane wit...
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