▎ 摘　　要

NOVELTY - A graphene oxide modified superhydrophilic or superhydrophobic oil-water separation membrane is prepared by adding 230-500 mass parts strong acid in ice water bath, stirring, adding 10-25 mass parts protogenic graphite powder and 5-10 mass parts sodium nitrate, stirring for 25-30 minutes, adding 30-60 mass parts oxidant, reacting for 1-1.5 hours, stirring under water bath at 30-35 degrees C, adding 460-500 mass deionized water, heating at 90-95 degrees C, stirring for 15-20 minutes, and adding 500-750 pts. wt. deionized water and 25-50 mass parts of 25-30% hydrogen peroxide solution. USE - Preparation of graphene oxide modified superhydrophilic or superhydrophobic oil-water separation membrane for separation of oil and water mixture and treatment of oily wastewater (all claimed). ADVANTAGE - Preparation process is simple and environment-friendly, and product is non-toxic and recyclable, does not need other chemical additives, and has excellent anti-swelling and mechanical property, low cost, low energy consumption, good separation effect, no side effect, and self-cleaning effect. DETAILED DESCRIPTION - A graphene oxide modified superhydrophilic or superhydrophobic oil-water separation membrane is prepared by adding 230-500 mass parts strong acid in ice water bath, stirring, adding 10-25 mass parts protogenic graphite powder and 5-10 mass parts sodium nitrate, stirring for 25-30 minutes, adding 30-60 mass parts oxidant, reacting for 1-1.5 hours, stirring under water bath at 30-35 degrees C, adding 460-500 mass deionized water, heating at 90-95 degrees C, stirring for 15-20 minutes, adding 500-750 pts. wt. deionized water and 25-50 mass parts of 25-30% hydrogen peroxide (H2O2) solution until reaction temperature is golden yellow, washing with deionized water, adding 3-5 mass parts of 35-36.5% hydrochloric acid (HCl) solution, repeatedly washing with deionized water until pH is 6.5-7.5, washing with graphite oxide suspension, drying to obtain graphene oxide, forming alcohol and water as cosolvent with mass ratio of 1:5-5:1, mixing tetraethoxysilane, tetramethoxysilane, or tetraethoxysilane titanium and cosolvent with mass ratio of 1:1-1:5 at 20-80 degrees C under water bath, stirring for 5-10 minutes, adding catalyst, insulating for 4-5 hours to obtain nano sol-gel, dissolving hydrophilic polymer water sensitizer and crosslinking film forming agent with ratio of 1:9-9:1 in water, uniformly stirring under magnetic stirrer to obtain solution having concentration of 1-99%, mixing nano sol-gel and obtained solution with mass ratio of 1:9-9:1 to obtain mixed solution, adding 0.5-1 mass% solid part of mixed solution in graphene oxide, controlling total solids concentration to 1-99%, ultrasonically dispersing, obtaining graphene oxide modified crosslinking hydrophilic nano-coating, ultrasonically cleaning into 100-300 meshes silk screen fabric, drying at room temperature, soaking for 5-20 minutes using vertical lift, spin coating, or high pressure spray gun, hanging coating wire, and vacuum drying at 100-200 degrees C in which strong acid is concentrated sulfuric acid, concentrated hydrochloric acid, concentrated nitric acid, concentrated phosphoric acid, and/or concentrated perchloric acid, oxidant is potassium permanganate, potassium chlorate, and/or potassium dichromate, alcohol is ethanol, propanol, isopropanol, n-butanol, sec.-butyl alcohol, and/or isobutyl alcohol, catalyst is hydrochloric acid, nitric acid, boric acid, sulfuric acid, ammonia water, sodium bicarbonate, or sodium hydroxide, hydrophilic polymer water sensitizer is polyvinyl alcohol, polyethylene glycol, polyethylene oxide, diallyl quat.-ammonium salt polymer, chitosan, polymaleic acid, polyaspartic acid, polyepoxysuccinic acid, carboxymethyl cellulose, carboxyethyl cellulose, xanthan gum, and/or vegetable gum, and crosslinking film forming agent is polyacrylic acid, polymethacrylic acid, polyacrylic acid-acrylic acid ester copolymer, polymethacrylic acid-acrylic acid ester copolymer, hydroxyl acrylic resin, amino resin, and/or polyurethane acrylate. DESCRIPTION OF DRAWING(S) - The drawing shows an infrared spectrum of nano silicon dioxide in which surface is rich in hydroxyl. (Drawing includes non-English language text).