A composite photocatalyst with oxidation-reduction performance and its preparation method
A composite light and catalyst technology, applied in physical/chemical process catalysts, carbon monoxide, chemical instruments and methods, etc., can solve the problems of inability to prepare reduced and oxidized nanomaterials, unavoidable photocorrosion, photoelectron deactivation, etc. Convenient, simple, reliable and feasible preparation method, low cost effect
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Embodiment 1
[0039] Dissolve 0.608g ammonium citrate in 25mL deionized water, stir to dissolve and add 0.4g TiO 2 nanosheets, stirred for 1 h, ultrasonicated for 20 min, and a mixed solution was obtained after stirring for 20 min. The mixed solution obtained above was transferred to a high-temperature reaction kettle and placed in an oven with a hydrothermal temperature of 160° C. and a hydrothermal time of 4 hours. After the reaction was completed, it was naturally cooled to room temperature, and the obtained reaction product was washed by centrifugation repeatedly with deionized water, and then dried at 60°C to obtain carbon quantum dots / TiO 2The heterostructure photocatalyst is denoted as 0.1CDs-TNs.
[0040] When the input amount of ammonium citrate was adjusted to 1.216g, 1.824g or 2.432g, and other conditions remained unchanged, the composite photocatalysts 0.2CDs-TNs, 0.3CDs-TNs and 0.4CDs-TNs were prepared respectively according to the above method.
[0041] figure 1 The ultravi...
Embodiment 2
[0048] Dissolve 1.216g ammonium citrate in 25mL deionized water, stir to dissolve and add 0.4g TiO 2 The nanosheets were stirred for 30 minutes, ultrasonicated for 20 minutes, and a mixed solution was obtained after stirring for 20 minutes. The mixed solution obtained above was transferred to a high-temperature reaction kettle and placed in an oven with a hydrothermal temperature of 145° C. and a hydrothermal time of 15 hours. After the reaction was completed, it was naturally cooled to room temperature, and the obtained reaction product was washed by centrifugation repeatedly with deionized water, and then dried at 80°C to obtain carbon quantum dots / TiO 2 Heterostructured photocatalysts. After testing, it was found that its 2h degradation efficiency of RhB was 63.1%, and the CO reduction yield was 2.01μmol / (g h) -1 , due to the influence of hydrothermal time and temperature, the nanocomposite product of this embodiment does not achieve the best effect in terms of oxidation ...
Embodiment 3
[0050] Dissolve 1.216g of ammonium citrate in 25mL of deionized water, stir to dissolve and add 0.4TiO 2 nanosheets, stirred for 1 h, ultrasonicated for 20 min, and a mixed solution was obtained after stirring for 20 min. The mixed solution obtained above was transferred to a high-temperature reaction kettle and placed in an oven with a hydrothermal temperature of 145° C. and a hydrothermal time of 12 hours. After the reaction was completed, it was naturally cooled to room temperature, and the obtained reaction product was washed by centrifugation repeatedly with deionized water, and then dried at 80°C to obtain carbon quantum dots / TiO 2 Heterostructured photocatalysts. After testing, it is found that it has both oxidation and reduction functions, the degradation rate of RhB is 36.7% in 2h, and the CO reduction output is 2.07μmol / (g h) -1 , due to the influence of hydrothermal temperature and time, the oxidation and reduction of nanocomposites did not achieve the best result...
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