▎ 摘　　要

NOVELTY - Preparing nickel-titanium hydrotalcite and graphene layer photocatalytic forward osmosis membrane comprises (a) adding nickel salt to deionized water, adjusting pH to 3-5 with concentrated hydrochloric acid, stirring for 30-60 minutes, adding 0.001-0.004 wt.% titanium tetrachloride solution, stirring to dissolve, adding urea, reacting in hydrothermal constant temperature system at 70-100 degrees C for 18-24 hours, centrifugally washing the resultant with deionized water, and drying, (b) Stripping 0.028-0.69 g of layered double hydroxides with dimethylacetamide (DMAc) to obtain positively charged hydrotalcite laminate (NiTi-EHT) solution, (c) dispersing graphene oxide ultrasonically in deionized water to prepare graphene oxide aqueous solution having mass fraction of 1-25%, ultrasonic power of 100-300W, and ultrasonic time of 20-60min, and (d) immersing quartz wafer in mixed solution having hydrogen peroxide and concentrated sulfuric acid, removing, rinsing, and blow drying. USE - The method useful for preparing nickel-titanium hydrotalcite and graphene layer photocatalytic forward osmosis membrane. ADVANTAGE - The method applies to micro/measured in water environment pollution substance. The nickel-titanium hydrotalcite and graphene layer photocatalytic forward osmosis membrane has self assembled film, good stability, separating and degrading cycle life, good hydrophilic and catalytic performance. DETAILED DESCRIPTION - Preparing nickel-titanium hydrotalcite and graphene layer photocatalytic forward osmosis membrane comprises (a) adding nickel salt to deionized water, adjusting pH to 3-5 with concentrated hydrochloric acid, and stirring for 30-60 minutes, adding 0.001-0.004 wt.% titanium tetrachloride solution, and stirring to dissolve, adding urea and reacting in hydrothermal constant temperature system at 70-100 degrees C for 18-24 hours, centrifugally washing the resultant with deionized water, and drying, (b) stripping 0.028-0.69 g of layered double hydroxides (LDHs) with dimethylacetamide (DMAc) to obtain 0.1-2.5% positively charged hydrotalcite laminate (NiTi-EHT) solution, (c) dispersing graphene oxide ultrasonically in deionized water to prepare graphene oxide aqueous solution having mass fraction of 1-25%, ultrasonic power of 100-300W, and ultrasonic time of 20-60min, and (d) immersing quartz wafer in mixed solution having 30% hydrogen peroxide and 98% concentrated sulfuric acid (3:7) for 30 minutes to 1 hour, removing, rinsing, and blow drying to prepare quartz substrate; (e) immersing the quartz substrate in NiTi-EHT solution and graphene oxide solution in turn, soaking for 10-20 minutes, rinsing with nitrogen purge and introducing into the next solution immersion, completing one assembly and form double layer, continuing to deposit alternately, forming self-assemble layer by layer into 2-10 times to obtain 2-10 layer self-assembled composite film; and (f) immersing the quartz piece in 0.4-0.6 % hydrofluoric acid solution for 8-12 minutes, take out the layers of self-assembled film, heating at 50 degrees C for 5-8 minutes, and rinsing with deionized water for 10 minutes to obtain a nickel-titanium hydrotalcite-graphene oxide photocatalytic forward osmosis membrane.