A kind of titanium dioxide hollow microsphere with high visible light activity and its preparation method and application
A technology of titanium dioxide and hollow microspheres, applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of explosion and high equipment requirements, and achieve the effects of improving separation efficiency, simple operation procedures, and excellent NO activity.
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Embodiment 1
[0028] A preparation method of high visible light activity high oxygen vacancy titanium dioxide hollow microspheres, comprising the following steps:
[0029] (1) References (Appl.Catal.B, 2014, 147, 789-795), the synthesis of precursor titanium dioxide hollow microspheres, the details of the method are as follows:
[0030] Under magnetic stirring, 4.84g urea was dissolved in 130mL distilled water, then 2.38g (NH 4 ) 2 TiF 6 Let it all dissolve. Then add 30 mL of reagent H dropwise 2 o 2 (mass fraction is 30%), and the resulting yellow mixed solution was transferred to a 200mL polytetrafluoroethylene autoclave, and sealed in a 200°C hydrothermal reactor for 10 hours. After cooling, filter the product, wash the precipitate with distilled water to neutrality, disperse the filter cake in 100mL 10M sodium hydroxide solution, then transfer to a 200mL polytetrafluoroethylene autoclave and seal it, and make it hydrothermally treated at 120°C 3 hours. After cooling, filter, and ...
Embodiment 2
[0035] A preparation method of high visible light activity high oxygen vacancy titanium dioxide hollow microspheres, comprising the following steps:
[0036] (1) with embodiment 1;
[0037](2) Take 2.0g of the titanium dioxide hollow microsphere precursor prepared in step (1) and 2.0g of urea, and add them to a 30mL ceramic crucible with 15ml of distilled water to mix evenly, and then place it at 60°C for drying , and then put the obtained mixture in a muffle furnace and heat up to 550°C at a rate of 2.3°C / min for calcination for 4 hours. After the calcination, cool to room temperature to obtain the highly visible light-active high oxygen vacancy titanium dioxide hollow microspheres, which are marked as U2.
[0038] The X-ray diffraction pattern of U2 sample is as follows figure 1 (d) shown. Similar to U1, the U2 sample can see the characteristic diffraction peak at 2θ=25.3°, which corresponds to the anatase TiO 2 The characteristic diffraction peak of the (101) crystal pl...
Embodiment 3
[0041] A preparation method of high visible light activity high oxygen vacancy titanium dioxide hollow microspheres, comprising the following steps:
[0042] (1) with embodiment 1;
[0043] (2) Take 2.0 g of the titanium dioxide hollow microsphere precursor prepared in step (1) and 4.0 g of urea, and add them to a 30 mL ceramic crucible with 15 mL of distilled water to mix evenly, and then place it at 60 ° C for drying , and then put the obtained mixture in a muffle furnace and heat up to 550°C at a rate of 2.3°C / min for calcination for 4 hours. After the calcination, cool to room temperature to obtain the highly visible light-active high oxygen vacancy titanium dioxide hollow microspheres, which are marked as U4.
[0044] The X-ray diffraction pattern of U4 sample is as follows figure 1 (e) shown. Similar to U1, the U4 sample can see the characteristic diffraction peak at 2θ=25.3°, which corresponds to the anatase TiO 2 The characteristic diffraction peak of the (101) cry...
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