Process for preparing TiO2 two-dimensional flake-like composite photocatalytic material with MoS2 / exposed (001) surface
A technology of composite photocatalysis and sheet-like materials, which is applied in the field of preparation of TiO2 two-dimensional sheet-like composite photocatalytic materials, can solve the problem of low responsiveness to visible light, achieve enhanced photocatalytic activity, increase photoresponse activity, and improve response Effect
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Embodiment 1
[0033] TiO 2 The hydrothermal preparation process of nanosheets is as follows: 25mL tetrabutyl titanate (Ti(OC 4 h 9 ) 4 ) and 3mL of hydrofluoric acid (HF, concentration 40%) were added to a 100mL polytetrafluoroethylene reactor and stirred evenly, then hydrothermally heated at 200°C for 24 hours, and the white precipitate obtained was washed with ethanol, distilled water and Wash 3 times with 1M NaOH aqueous solution, and dry at 80°C for 12 hours in a blast drying oven.
[0034] Molybdenum disulfide (MoS 2 ) / exposed (001) surface TiO 2 Two-dimensional layered composite materials: the preparation of TiO by the previous step 2 Ultrasonic dispersion of nanosheets in sodium molybdate (Na 2 MoO 4 .2H 2 O) and thioacetamide (C 2 h 5 NS) in an aqueous solution, hydrothermal reaction was carried out at 200 ° C for 24 hours to prepare MoS 2 The content is 1wt%, 3wt%, 5wt%, 7wt% MoS 2 / TiO 2 2D composite materials. Pure MoS 2 Preparation and MoS 2 / TiO 2 The synthesis...
Embodiment 2
[0037] Weigh 50 mg of photocatalyst and place it in a watch glass, add appropriate amount of distilled water to ultrasonically disperse into a uniform suspension, and dry at 80°C to form a film. Measure 50mL 1.5×10 -5 Methylene blue (MB) was poured into the surface dish that has been filmed, and dark treatment was carried out for 60 minutes to make MB reach the equilibrium of adsorption and desorption on the surface of the material. , take a sample every 5 minutes, and test the absorbance value of the methylene blue solution on a Shimadzu UV-2450 ultraviolet spectrophotometer. The absorbance of low-concentration methylene blue has a good linear relationship with the concentration, following the Lambert-Beer law. Represent the degradation rate of methylene blue with η that is η=(A 0 -A) / A 0 ×100%, where A 0 Indicates the first absorbance measured after the dark treatment; A indicates the absorbance of methylene blue under different illumination times.
[0038] figure 2 is...
Embodiment 3
[0041] MoS 2 / Exposed (001) side TiO 2 The two-dimensional sheet-like composite photocatalytic material was dispersed by ultrasonic cleaning with acetone, alcohol and deionized water in sequence, each time for 10 min, and its morphology was observed with a field emission scanning electron microscope.
[0042] Figure 4 is the MoS of this example 2 / Exposed (001) side TiO 2 Scanning electron microscope topography of two-dimensional sheet-like composite photocatalytic material, in the figure: a and b represent the electron microscope schematic diagrams of different multiples of titanium dioxide on the (001) crystal plane, and c represents MoS 2 Schematic diagram of electron microscope, d and e represent 5% MoS, respectively 2 with (001) facet TiO 2 Schematic diagram of electron microscopy at different magnifications of composite materials. It can be seen from the figure that the pure (001) crystal plane TiO 2 It is composed of sheet-like structure substances with relati...
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