▎ 摘　　要

NOVELTY - Desalination composite membrane comprises microporous ceramic layer, graphene oxide layer and silica gas phase layer, where e.g. silica gas phase layer is cured by silica gas phase coating, and silica gas phase coating is prepared by adding tetraethyl orthosilicate into 80-100 times the amount of 65-75 wt.% aqueous ethanol, raising temperature to 55-65 degrees C, then adding 8-12 wt% hydrochloric acid solution, reacting tetraethyl orthosilicate to form silica sol, adding iron powder and toner into the sol, and stirring the mixture to obtain silica gas phase coating. USE - The membrane is useful in production and magnetization of direct drinking water (claimed). ADVANTAGE - The membrane has high desalination rate, strong surface stain resistance, and long service life. DETAILED DESCRIPTION - Desalination composite membrane comprises microporous ceramic layer, graphene oxide layer and silica gas phase layer, where average pore size of microporous ceramic layer is 1-10 microns; average filtration pore size of graphene oxide layer is 1-5 nm; average filtration pore size of silica gas phase layer is greater than 20 microns; silica gas phase layer is cured by silica gas phase coating, and silica gas phase coating is prepared by adding tetraethyl orthosilicate into 80-100 times the amount of 65-75 wt.% aqueous ethanol, raising temperature to 55-65 degrees C, then adding 8-12 wt% hydrochloric acid solution, reacting tetraethyl orthosilicate to form silica sol, adding iron powder and toner into the sol, and stirring the mixture to obtain silica gas phase coating. An INDEPENDENT CLAIM is also included for preparing desalination composite membrane comprising (i) preparing ceramic slurry, coating ceramic slurry on smooth substrate, rolling and drying, curing to form microporous ceramic layer, and peeling microporous ceramic layer from the substrate, (ii) preparing graphene oxide solution, spraying it onto the surface of microporous ceramic layer, and then subjecting to vacuum filtration to form graphene oxide layer, and (iii) preparing silica gas phase coating, coating it on the surface of the graphene oxide layer, allowing to stand and aging, drying silica gas phase layer to obtain finished product.