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Application and preparation method of In2Se3 quantum dots

A technology of in2se3 and quantum dots, applied in chemical instruments and methods, water/sludge/sewage treatment, binary selenium/tellurium compounds, etc., can solve the problems of high recombination rate, low carrier mobility and affecting photocatalytic efficiency and other problems, to achieve the effect of good stability, simple preparation, and improved photocatalytic efficiency

Active Publication Date: 2020-12-11
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]The traditional photocatalyst TiO2 can only absorb 5% of the solar radiation energy due to its large band gap, and the charge carriers Low mobility and high recombination rate seriously affect photocatalytic efficiency

Method used

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  • Application and preparation method of In2Se3 quantum dots
  • Application and preparation method of In2Se3 quantum dots
  • Application and preparation method of In2Se3 quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take In 2 Se 3 Put 200mg of crystal powder in a jar, add 100ml of IPA solvent, and ultrasonically accumulate 6h at a power of 450W, then centrifuge at 7000rmp / min for 20min to obtain the quantum dot supernatant, and centrifuge at a centrifugation rate of 10000rmp / min Centrifuge for 30 min to precipitate the quantum dots in the solution; wash the precipitate 3 times with absolute ethanol and dry at 40°C at low temperature to obtain In 2 Se 3 quantum dots.

[0029] Since In 2 Se 3 Has a variety of crystal phases and crystal forms, so the preparation of In 2 Se 3 Before quantum dots, it is necessary to determine the crystal phase and crystal form of the raw material crystal powder used. figure 1 , figure 2 For preparing In in the present invention 2 Se 3 XRD and Raman diagrams of crystal raw materials used in quantum dots; from figure 1 It can be seen that the raw material In 2 Se 3 The crystal powder matches the rhombohedral α phase of the layered structure,...

Embodiment 2

[0033] Take In 2 Se 3 200mg of crystal powder was placed in a jar, and 100ml of IPA solvent was added, and the power of 600W was ultrasonically accumulated for 6h, and then centrifuged at 7000rmp / min for 20min to obtain the supernatant of quantum dots, and the supernatant was obtained under the centrifugation rate of 10000rmp / min Centrifuge for 30 min to precipitate the quantum dots in the solution; wash the precipitate 3 times with absolute ethanol and dry at 40°C at low temperature to obtain In 2 Se 3 quantum dots.

[0034] Figure 7 , Figure 8 For the prepared In 2 Se 3 TEM morphology and particle size statistics of quantum dots. From Figure 7 It can be seen from the figure that after ultrasonication at 600W for 6 hours, the distribution of quantum dots after centrifugal screening at 7000rmp / min is relatively uniform, and the shape is clear. The shape of each quantum dot is approximately spherical. get Figure 8 , it can be seen that the particle size distribution...

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Abstract

The invention discloses an application method based on In2Se3 quantum dots. The invention also discloses a preparation method of the In2Se3 quantum dots, which comprises the following specific steps:by using In2Se3 crystal powder as a raw material, carrying out ultrasonic stripping in a polar solvent to obtain a dispersion liquid containing the In2Se3 quantum dots, centrifuging at lower rotatingspeed, taking the supernatant, and carrying out high-speed centrifugal treatment to precipitate the quantum dots in the dispersion liquid; and cleaning the precipitate with absolute ethyl alcohol, anddrying at low temperature to obtain In2Se3 quantum dot powder. The preparation conditions of the In2Se3 quantum dots provided by the invention are simple and easy to operate, the cost is low, and theobtained In2Se3 quantum dot is uniform in size and has good biocompatibility. The invention provides application of In2Se3 quantum dots as a photocatalyst in the field of dye degradation. The In2Se3quantum dots are remarkable in effect. According to the composite photocatalyst disclosed by the invention, more active sites are provided due to the small size of the composite photocatalyst, and therecombination of photon-generated carriers is reduced, so that the dye degradation rate can reach 48.9%.

Description

technical field [0001] The present invention relates to In 2 Se 3 The application of quantum dots and its preparation method, specifically the field of dye degradation. Background technique [0002] Today, environmental pollution is a common problem faced by the whole world. Using semiconductor photocatalysis to degrade pollutants is the best way to solve the problem, and the selection of efficient and stable photocatalysts is the most important thing in this process. Traditional photocatalyst TiO 2 Due to the large band gap, it can only absorb ultraviolet light accounting for 5% of the solar radiation energy, and the carrier mobility is low and the recombination rate is high. When using it, additional oxidants need to be added, which seriously affects the photocatalytic efficiency. Therefore, it is of great significance to find and develop new photocatalysts for efficient degradation. [0003] At present, the methods for treating dye wastewater mainly include physical a...

Claims

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Application Information

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IPC IPC(8): C01B19/04B82Y40/00C02F1/30C02F1/32C02F101/30
CPCC01B19/007B82Y40/00C02F1/30C02F1/32C02F2305/10C02F2101/308C01P2004/04C01P2004/64Y02W10/37
Inventor 严仲崔颖豪
Owner NANJING UNIV OF SCI & TECH