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Indium zinc sulfide nanosheet/tubular tin oxide heterojunction and preparation method thereof, and application of indium zinc sulfide nanosheet/tubular tin oxide heterojunction in degradation and removal of water pollutants

A technology of indium zinc sulfide and nanosheets, applied in water pollutants, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low photon yield, easy agglomeration, human and environmental damage, etc., to improve separation efficiency , large specific surface area, simple operation effect

Active Publication Date: 2020-01-17
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium has high toxicity and bioaccumulation, which will cause inestimable harm to human body and environment
With the development of nanomaterials and nanotechnology, zinc indium sulfide (Znln 2 S 4 ) Nanophotocatalytic materials have been favored by researchers. However, there are still some problems in practical applications of nanoscale indium zinc sulfide, such as the photogenerated electron-hole recombination rate is too fast, the photon quantum yield is low; easy to agglomerate, greatly reducing its photocatalytic activity

Method used

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  • Indium zinc sulfide nanosheet/tubular tin oxide heterojunction and preparation method thereof, and application of indium zinc sulfide nanosheet/tubular tin oxide heterojunction in degradation and removal of water pollutants
  • Indium zinc sulfide nanosheet/tubular tin oxide heterojunction and preparation method thereof, and application of indium zinc sulfide nanosheet/tubular tin oxide heterojunction in degradation and removal of water pollutants
  • Indium zinc sulfide nanosheet/tubular tin oxide heterojunction and preparation method thereof, and application of indium zinc sulfide nanosheet/tubular tin oxide heterojunction in degradation and removal of water pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Pipette 5mL of absolute ethanol and 5mL of N,N'-dimethylformamide sequentially, stir for 5min with magnetic force, and then add 1g of SnCl 2 And stirred for 5 minutes, 1.2g of PVP was added while stirring, and then stirred continuously for 12h to form a uniform transparent solution; subsequently, the transparent solution was used for electrospinning. Among them, the precursor solution was injected with a syringe at 0.2 mm min -1 Feed at a constant rate, connect a DC power supply to provide a high voltage of 15 KV, and place an aluminum foil at a distance of 15 cm from the needle tip to collect SnCI 2 / PVP composite fiber.

[0036] The above SnCI 2 / PVP composite fiber is calcined at a high temperature at 600°C and the heating rate is 2°C / min (room temperature to 600°C). After calcination for 3 hours, it is naturally cooled to room temperature. The calcined product is ground into powder with a mortar to obtain tubular SnO 2 , this is SnO 2 nanotube.

[0037] Add 1 m...

Embodiment 2

[0040] The indium zinc sulfide nanosheet / tubular tin oxide heterojunction of Example 1 was placed in simulated wastewater containing hexavalent chromium (potassium dichromate was used as the chromium source to obtain a hexavalent chromium solution), with a xenon lamp as the light source, and light For a certain period of time, the change curve of the concentration of hexavalent chromium in the water with the light time was measured, so as to evaluate the photocatalytic degradation effect of the composite material on the pollutants in the water under visible light.

[0041] Add 30 mg of indium zinc sulfide nanosheets / tubular tin oxide heterojunction prepared above into 50 mL of hexavalent chromium sewage with a concentration of 50 ppm. Stir for 1 h under dark conditions to make it reach adsorption equilibrium. Subsequently, the xenon lamp light source is turned on, and the catalyst degrades the hexavalent chromium in water under visible light.

[0042] The specific degradation...

Embodiment 3

[0046] Testing of the degradation curves of the InZnS nanosheet / tubular SnO heterojunction when the concentration of the initial hexavalent chromium solution was different. Using the test method of Example 2, the degradation efficiency of hexavalent chromium with different initial concentrations was tested, and it decreased with the increase of the concentration. When the concentration is 10ppm, the degradation rate can reach 100% within 10 minutes, and the effect is very good. When the initial concentration is 20ppm and 30ppm, it can reach 100% within 30 and 60 minutes, respectively, indicating that the composite material is more conducive to the photocatalytic degradation of low concentration of hexavalent chromium. attached Figure 4 It is the degradation curve of the IZnS nanosheet / tubular tin oxide heterojunction when the concentration of the initial hexavalent chromium solution is different.

[0047] When the pH of the initial hexavalent chromium solution (concentratio...

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Abstract

The invention discloses an indium zinc sulfide nanosheet / tubular tin oxide heterojunction and a preparation method thereof, and application of the indium zinc sulfide nanosheet / tubular tin oxide heterojunction in degradation and removal of water pollutants. According to the method, tin oxide nanotubes are prepared through an electrostatic spinning technology and a high-temperature calcination technology; and tin oxide serves as a substrate, and indium zinc sulfide nanosheets evenly grow on the surface of the substrate through an oil bath so as to construct the indium zinc sulfide nanosheet / tubular tin oxide heterojunction. Indium zinc sulfide is an important metal sulfide, has a band gap width of 2.6 to 2.7 eV and is a good semiconductor material, so the prepared indium zinc sulfide nanosheet / tubular tin oxide heterojunction has a large specific surface area, can provide more adsorption sites and catalytic active sites, effectively improves the separation efficiency of photo-induced electrons and holes, further improves the activity of a photocatalytic reaction, and can be better used for photocatalytic separation and degradation of water pollutants.

Description

technical field [0001] The invention relates to the technical field of inorganic nanocomposite materials, in particular to the preparation of indium zinc sulfide nanosheet / tubular tin oxide heterojunction and its photocatalytic degradation and removal of water body pollutants. Background technique [0002] Environmental and energy issues are prominent issues in the 21st century, and human beings have been trying various methods to solve these two major problems. Among them, solar energy is currently a hot topic in the research of environmental pollution control. Hexavalent chromium is a common heavy metal pollutant, mainly from factory wastewater. Hexavalent chromium has high toxicity and bioaccumulation, which will cause inestimable harm to human body and environment. Unlike other common heavy metals such as cadmium, chromium exists in two forms in solution: trivalent chromium and hexavalent chromium. Among them, the former is one of the trace elements needed by living o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J35/02C02F1/30C02F101/22
CPCB01J27/04C02F1/30C02F2101/22C02F2305/10B01J35/39B01J35/00B01J35/30
Inventor 路建美陈冬赟
Owner SUZHOU UNIV
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