▎ 摘　　要

NOVELTY - Multifunctional water-purifying ceramic material comprises 75 pts. wt. diatomaceous earth, 10 pts. wt. purple sand clay, 2 pts. wt. sodium carboxymethyl cellulose and 13 pts. wt. modified graphene and the multifunctional water-purifying ceramic material is prepared by (1) mixing pretreated phosphogypsum with hydrochloric acid, stirring and reacting, filtering to obtain calcium sulfate dihydrate whisker blanks, and drying calcium sulfate dihydrate whisker blanks to obtain calcium sulfate dihydrate whiskers, (2) preparing modified calcium sulfate whiskers, (3) preparing modified graphene, (4) taking diatomaceous earth, purple sand clay, sodium carboxymethyl cellulose and modified graphene, mixing with water to obtain binder, mixing purple sand clay and diatomite, adding modified graphene, mixing and grinding to obtain mixture, mixing mixture with binder, press-molding to obtain green blank, sintering green blank, cooling, discharging to obtain final product. USE - Used as multifunctional water-purifying ceramic material. ADVANTAGE - The multifunctional water-purifying ceramic material: has good filtering effect, bactericidal properties and thermal conductivity. DETAILED DESCRIPTION - Multifunctional water-purifying ceramic material comprises 75 pts. wt. diatomaceous earth, 10 pts. wt. purple sand clay, 2 pts. wt. sodium carboxymethyl cellulose and 13 pts. wt. modified graphene and the multifunctional water-purifying ceramic material is prepared by (1) mixing the pretreated phosphogypsum with 20 wt.% hydrochloric acid at a mass ratio of 1:5, and stirring and reacting at 80℃ for 10 minutes, filtering to obtain calcium sulfate dihydrate whisker blanks, and drying the calcium sulfate dihydrate whisker blanks at 85℃ for 2 hours to obtain calcium sulfate dihydrate whiskers, (2) mixing the calcium sulfate dihydrate crystal whiskers obtained in step (1) and 80 wt.% ethanol aqueous solution in a beaker at a mass ratio of 1:150, adding aqueous ammonia with a mass fraction of 2 times the mass of calcium sulfate dihydrate crystal whiskers and a mass fraction of 10% to the beaker, ethyl orthosilicate with 3 times the mass of calcium sulfate dihydrate whiskers and polyvinylpyrrolidone with 1.5 times the mass of calcium sulfate dihydrate whiskers, stirring and reacting for 12 hours at 45℃, and then filtering to obtain filter cake, drying the filter cake at 60℃ for 2 hours to obtain modified calcium sulfate whisker blank, mixing the modified calcium sulfate whisker blank with 15% γ-aminopropyltriethoxysilane ethanol solution in a mass ratio of 1:22, stirring and mixing for 6 hours, and filter to obtain modified calcium sulfate whiskers, (3) mixing graphene oxide dispersion and aniline in a flask by mass ratio of 10:3, and adding the modified calcium sulfate whiskers obtained in step (2) with the mass of graphene oxide dispersion liquid of 0.2 times to the flask, and stirring and mixing, to obtain graphene oxide mixed liquid, mixing the graphene oxide mixed solution with the catalyst solution in a volume ratio of 4:1, stirring and reacting for 6 hours at a temperature of 6℃, and then filtering to obtain modified graphene blank, and heating the modified graphene blank at 85℃, drying for 1.5 hours under the same conditions, grinding for 35 minutes to obtain modified graphene, (4) taking 75 pts. wt. diatomaceous earth, 10 pts. wt. purple sand clay, 2 pts. wt. sodium carboxymethyl cellulose and 13 pts. wt. modified graphene obtained in step (3), mixing water in a mass ratio of 1:50 to obtain binder, and mixing the purple sand clay and diatomite, adding modified graphene, mixing and grinding to obtain mixture, mixing the mixture with binder, press-molding to obtain green blank, sintering the green blank, cooling to room temperature, discharging to obtain multifunctional water-purifying ceramic material, where the preparation method of the pretreated phosphogypsum in step (1) includes crushing the phosphogypsum by ball milling, passing through a 200-mesh sieve to obtain refined phosphogypsum, and washing the refined phosphogypsum with deionized water for 2-4 times to obtain pretreated-phosphogypsum, mixing graphene oxide dispersion liquid of step (3) with graphene oxide and water in a mass ratio of 1:120, and ultrasonic dispersing under the condition of frequency of 55 kHz for 20 minutes to obtain graphene oxide dispersion liquid, where the catalyst solution is to mix ammonium persulfate and hydrochloric acid whose concentration is 1 mol/l by mass ratio of 1:10 to obtain catalyst solution, the pressure condition of the compression molding in step (4) is 36 MPa, the process condition of the sintering in step (4) is that after heating in the air at 195℃ for 2 hours, then heating to 800℃ at a heating rate of 3℃/minute in a nitrogen atmosphere, maintaining for 2 hours, and finally heating to 1150℃ at a heating rate of 3℃/minute in an air atmosphere, and sintering for 35 minutes.