Nanosheet core-shell composite material with photocatalytic performance, its preparation method and application
A composite material and nanosheet technology, applied in the field of photocatalysis, can solve the problem of low utilization efficiency of light, and achieve the effects of increasing specific surface area, wide application prospects, and convenient and convenient recycling.
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Embodiment 1
[0035] In this example, see Figure 1-Figure 3 , a nanosheet core-shell composite material with photocatalytic properties, in which ZnSe nanoribbons are combined with CdSe layers to form a ZnSe-CdSe core-shell nanoribbon array, so that the heterojunction between ZnSe and CdSe interfaces forms photocatalytic active sites region, thereby forming a nanosheet core-shell composite. The width of the ZnSe nanobelt is 100-120nm, the CdSe layer is the outer layer of the ZnSe nanometer bandwidth, the width of the CdSe layer is not greater than the width of the ZnSe nanobelt, and the thickness of the CdSe layer is 5-15nm.
[0036] A method for preparing a nanosheet core-shell composite material with photocatalytic performance in this embodiment, comprising the steps of:
[0037] a. Substrate pretreatment:
[0038] Using a Zn substrate, ultrasonically cleaning the Zn substrate with deionized water, acetone, and absolute ethanol in sequence, and then drying the purified Zn substrate to o...
Embodiment 2
[0047] This embodiment is basically the same as Embodiment 1, especially in that:
[0048] In this example, the nanosheet core-shell composite material with ZnSe nanobelts and ZnSe / CdSe core-shell nanobelt arrays prepared by the method in Example 1 was used as the sample to be tested.
[0049] Photodegradation of RhB was carried out under visible light irradiation. In this example, the H 2 o 2 And the sample to be tested was added to the RhB solution. After mixing, leave the solution in the dark for a while. Stable in the dark, remove a portion of the supernatant for testing UV-vis absorption spectra. Absorbance was measured at the maximum absorption wavelength λ=553 nm. The mixed solution was irradiated under visible light, and the supernatant was taken every 20 minutes for UV-Vis absorption spectrum measurement to determine the solution concentration of RhB.
[0050] For the degradation kinetics of RhB of the nanosheet core-shell composite material with ZnSe nanobelts ...
Embodiment 3
[0052] This embodiment is basically the same as the previous embodiment, and the special features are:
[0053] In this example, the nanosheet core-shell composite material with ZnSe nanobelts and ZnSe / CdSe core-shell nanobelt arrays prepared by the method in Example 1 was used as the sample to be tested.
[0054] The photodegradation of MB is carried out under the irradiation of visible light. In this embodiment, the sample to be tested is added to the MB solution. After mixing, leave the solution in the dark for a while. Stable in the dark, remove a portion of the supernatant for testing UV-vis absorption spectra. Absorbance was measured at the maximum absorption wavelength λ=664 nm. The mixed solution was irradiated under visible light, and the supernatant was taken every 20 minutes for UV-Vis absorption spectroscopy to determine the solution concentration of MB.
[0055] The degradation kinetics diagram of the nanosheet core-shell composite material with ZnSe nanobelts ...
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Abstract
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