▎ 摘　　要

NOVELTY - Preparing graphene-gold-titanium dioxide multi-element composite nano-tube material, comprises i.e. mixing uniformly titanium dioxide, sodium hydroxide, graphene powder and gold metal compound, then melting, and mixing with sodium hydroxide solution to obtain mixed titanate alkali fusion block containing gold metal ion, drying, washing, calcining to obtain graphene-gold-titanium dioxide multi-element composite nano-tubes, carrying out drying in vacuum high temperature furnace under argon gas, then naturally cooling, and grinding to obtain final product. USE - The method is useful for preparing composite nano-tube material (claimed). ADVANTAGE - The method: has low cost, requires less time, greatly improves length of nano-tubes; produced product is stable, and can effectively improves photocatalytic characteristic. DETAILED DESCRIPTION - Preparing graphene-gold-titanium dioxide multi-element composite nano-tube material, comprises (i) adding titanium dioxide and sodium hydroxide in a molar ratio of 8:1 into corundum crucible, then adding 0.01-10.0 wt.% graphene powder and gold metal compound into corundum crucible, and mixing uniformly, where the amount of metal ion Au3+ in gold metal compound is 0.01-5%, (ii) at room temperature, placing the corundum crucible filled with the mixed raw material in isolated air of vacuum high temperature furnace, closing the furnace door, opening argon gas flow valve, introducing argon gas for 30-120 minutes to remove air in the furnace, heating the mixed raw material to 400-500 degrees C from room temperature at a heating speed of 5 degrees C/minute, melting and mixing raw materials for 30-60 minutes, cooling high temperature furnace to room temperature, taking out the corundum crucible, closing argon gas, then forming a raw material containing graphene, and to obtain mixed titanate alkali fusion block containing gold metal ion, (iii) placing obtained mixed titanate alkali fusion block into polytetrafluoroethylene plastic beaker, then dissolving using proper amount of boiling distilled water, then adding not less than 10 mol/l sodium hydroxide solution, and mixing titanate alkali fusion block to obtain mixed titanate precipitate, (iv) placing polytetrafluoroethylene plastic beaker containing mixed titanate precipitate covered with lid in a dryer, then placing the dryer in oven, and carrying out hydrothermal reaction at 110-130 degrees C for 2-5 days to obtain composite titanate nano-tubes, (v) taking out plastic beaker and cooling to room temperature, washing mixed titanate nano-tubes precipitate to neutral using tap water, then washing with 2% nitric acid in order to replace Na+ by H+, and washing using distilled water to neutral, (vi) transferring mixed titanate nanotube precipitate into a glass beaker, placing the glass beaker into argon gas device of vacuum high temperature furnace, closing the high temperature furnace door, remove air inside the furnace by introducing argon gas for 60-120 minutes, heating the furnace from room temperature to 500 degrees C at a heating speed of 5 degrees C/minute, then calcining for 2 hours, where in the heating and cooling processes, do not open the door, do not turn off argon gas and to ensure the furnace from isolating oxygen and to avoid the formation of graphene to oxidized graphene from elemental carbon atoms, or to generate carbon monoxide, carbon dioxide, to obtain graphene-gold-titanium dioxide multi-element composite nano-tubes, (vii) closing the high temperature furnace, carrying out drying in vacuum high temperature furnace under argon gas, naturally cooling to room temperature, then closing the argon gas flow valve, and grinding to obtain final product.