Preparation method of titanium dioxide nano material with core-shell structure
A technology of nanomaterials and core-shell structures, applied in the field of materials, can solve problems such as potential safety hazards, increased production costs, and increased environmental burdens, and achieve the effects of reducing production costs, simplifying preparation procedures, and reducing costs
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[0028] 2. Preparation of titania core-shell precursor
[0029] Put the titanium-containing reaction liquid into a stainless steel reaction kettle lined with polytetrafluoroethylene, seal it, and put it in an oven at 170-190 ° C. After the reaction is completed, it is cooled to room temperature to obtain a precipitate. Of course, the precipitate can be processed Simple purification, such as washing the precipitate repeatedly with deionized water and absolute ethanol, and then centrifuging, then it is the titanium dioxide core-shell precursor.
[0030] The reaction time of the titanium-containing reaction solution under airtight and 170-190°C conditions is generally 20-24 hours. Such a time setting can ensure the yield of the titanium dioxide core-shell precursor in this step, and also avoid the formation of other by-products.
[0031] 3. Preparation of titanium dioxide nanomaterials with a core-shell structure
[0032] Generally, the titanium dioxide core-shell precursor is dr...
Embodiment 1
[0035] Dissolve 0.032 mol of glucose in a mixed solution of 80 mL of deionized water and ethanol, the volume ratio of deionized water and ethanol is 1:7, add 8 mmol of titanium trichloride solution under continuous stirring, stir at 60°C to obtain a clear solution, and store Put it into a stainless steel reaction kettle with a volume of 100mL polytetrafluoroethylene liner, seal it, put it in an oven at 180°C, keep it warm for 24 hours, and cool to room temperature. The obtained precipitate is washed repeatedly with deionized water and absolute ethanol, centrifuged Separated, dried at 80°C for 24 hours, and calcined at 550°C for 4 hours to obtain core-shell structure TiO 2 nanomaterials. figure 1 is the prepared core-shell structure TiO 2 X-ray diffraction pattern of nanomaterials, all characteristic diffraction peaks are related to anatase phase TiO 2 The standard card JCPDS No.21-1272 is consistent, and the product has high crystallinity and purity. Figure 2A is the prepa...
Embodiment 2
[0037] Dissolve 0.020mol glucose in 80mL mixed solution of deionized water and ethanol, the volume ratio of deionized water and ethanol is 1:9, add 5mmol titanium sulfate solution under continuous stirring, stir at 40°C to obtain a clear solution, put In a stainless steel reaction kettle with a volume of 100mL polytetrafluoroethylene lining, seal it, put it in an oven at 170°C, keep it warm for 24 hours, and cool it to room temperature. The obtained precipitate is washed repeatedly with deionized water and absolute ethanol, and centrifuged. , dried at 80°C for 24 hours and calcined at 550°C for 4 hours to obtain core-shell structure TiO 2 nanomaterials.
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