▎ 摘　　要

NOVELTY - Preparing silver and graphene co-modified titanium dioxide nano-wire comprises e.g. mixing titanium dioxide powder, surfactant and alkali solution, placing in a high pressure kettle, carrying out hydro-thermal reaction, centrifuging solid sample, washing, regulating pH, drying, obtaining white titanium dioxide nano-wire, preparing graphene modified titanium dioxide nano-wire, adding silver nitrate, ethanol and distilled water, mixing, introducing nitrogen, irradiating using ultraviolet light, using distilled water to wash, and drying to obtain the final product. USE - The nano-wire used for photocatalytic degradation of pollutants in wastewater (claimed). ADVANTAGE - The nano-wire expands the light of absorption in the visible range, increases the efficiency of the photo-electron transfer, reduces photo-generated electron and holes recombination probability, exhibits optical degradation ability and large absorbing capacity, has physical-chemical stable property, is prepared under mild condition, and is suitable for degrading pollutants in waste water. DETAILED DESCRIPTION - Preparing silver and graphene co-modified titanium dioxide nano-wire, comprises (i) preparing titanium dioxide nano-wire: adding titanium dioxide powder, surfactant and alkali solution and mixing, magnetically stirring, placing in a high pressure kettle, sealing reaction kettle, at 180-240 degrees C, carrying out hydro-thermal reaction for 12-24 hours, naturally cooling the high pressure kettle to the room temperature, centrifuging the obtained solid sample, washing using ethanol and deionized water to remove surfactant, regulating the pH to neutral, using deionized water to wash and chlorine ion in solution, drying, and obtaining white titanium dioxide nano-wire, (ii) preparing graphene modified titanium dioxide nano-wire: adding the graphene oxide in the deionized water, re-layering graphene ultrasonically, obtaining oxidized graphene oxide suspension, adding titanium dioxide nano-wire in graphene oxide suspension, using ultrasound again, regulating the pH value to neutral, carrying out heated reaction at 80-150 degrees C for 5-10 hours, adding the solution into a high pressure kettle, carrying out hydrothermal reaction at 180-240 degrees C for 20-24 hours, cooling the high pressure kettle naturally to the room temperature, centrifuging the obtained solid sample using deionized water and ethanol in turn flushing, drying to obtain the graphene modified titanium dioxide nanowire, and (iii) preparing graphene co-modified titanium dioxide nano-wire: adding silver nitrate, ethanol and distilled water in graphene modified titanium dioxide nano-wire and mixing, and then introducing nitrogen in solution, irradiating using 100-1000 W ultraviolet light for 2-4 hours, using distilled water for washing, and drying to obtain the final product.