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Light treatment modified MoS2, preparation method thereof and chromium wastewater treatment method

A treatment method and light treatment technology, applied in the direction of light water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of secondary pollution, complicated operation, high cost, etc., and achieve enhanced removal, Simple operation and the effect of increasing the specific surface area

Pending Publication Date: 2022-03-22
POWERCHINA HUADONG ENG COPORATION LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a large number of current studies are focused on the preparation of two-dimensional molybdenum disulfide, such as chemical vapor deposition, wet chemical synthesis, micromechanical exfoliation, intercalation exfoliation, electrochemical exfoliation, liquid phase exfoliation, etc. (for example: Yin Xianglu. Phase exfoliation method to prepare two-dimensional molybdenum disulfide functional materials and its mechanism [D]. Beijing: Beijing University of Chemical Technology, 2020.), but these methods are complicated to operate, high in cost, and easy to cause secondary pollution

Method used

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  • Light treatment modified MoS2, preparation method thereof and chromium wastewater treatment method
  • Light treatment modified MoS2, preparation method thereof and chromium wastewater treatment method
  • Light treatment modified MoS2, preparation method thereof and chromium wastewater treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: This example is a method for treating chromium wastewater, by modifying MoS with light treatment 2 Added to chromium wastewater to achieve efficient treatment of chromium wastewater.

[0029] In this example, light treatment modified MoS 2 The XRD spectrum of figure 1 As shown, it shows that there are characteristic peaks near the positions where 2θ is 9.18o, 14.38o, 32.67o, 35.87o, 42.58o, and 58.33o. Synthesized MoS 2 with bulk MoS 2 (interlayer spacing of 0.62nm) compared with the standard spectrum, the peak at 9.18o is added, which represents the bulk MoS with interlayer spacing of 0.95nm 2 peak. This shows that the MoS synthesized in this patent 2 is bulk MoS with two interlayer spacings 2. Such as figure 2 As shown, the light-treated modified MoS 2 Flower-like in TEM images.

[0030] In this example, light treatment modified MoS 2 The preparation method is as follows:

[0031] S0, sodium molybdate (Na 2 MoO 4 2H 2 O) and thioacetamide ar...

Embodiment 2

[0035] Example 2: This example is basically the same as Example 1, the only difference is that the light treatment modified MoS in this example 2 Step S2 of the preparation method is: MoS 2 The solution was irradiated for 2 h under visible light.

[0036] 0.05g (dry weight) of the light-treated modified MoS of this example 2 Disperse in 100mL of deionized water, mix and stir evenly, then add 0.0011g of potassium dichromate (Cr(VI) concentration is 4mg / L), pH=7, regularly sample under magnetic stirring, filter to obtain the supernatant, use The remaining content of chromate was measured by ultraviolet spectrophotometer. Through conversion, it was calculated that the removal rate of chromium had reached 75% at 0.5 h, and 100% at 1 h (in terms of antimony).

Embodiment 3

[0037] Example 3: This example is basically the same as Example 1, the only difference is that the light treatment modified MoS in this example 2 Step S2 of the preparation method is: MoS 2 The solution was irradiated for 5 h under visible light.

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Abstract

The invention relates to a preparation method of light treatment modified MoS2 and a chromium wastewater treatment method. The method is suitable for water treatment. The technical scheme adopted by the invention is as follows: the light treatment modified MoS2 is characterized in that the MoS2 is flower-shaped in a TEM (Transmission Electron Microscope) image, and the XRD (X-Ray Diffraction) spectrogram of the MoS2 has characteristic peaks near the positions where 2 theta is 9.18 degrees, 14.38 degrees, 32.67 degrees, 35.87 degrees, 42.58 degrees and 58.33 degrees. Compared with a standard spectrogram of blocky MoS2 (the interlayer spacing is 0.62 nm), the synthesized MoS2 has the advantages that a peak at 9.18 degrees is increased, and the diffraction peak represents the peak of the blocky MoS2 with the interlayer spacing being 0.95 nm. The result shows that the synthesized MoS2 is blocky MoS2 with two kinds of interlayer spacing. The invention relates to a preparation method of light treatment modified MoS2, which is characterized by comprising the following steps: S1, placing blocky MoS2 in deionized water according to a material-to-liquid ratio of 1: (50-5000) to form a MoS2 solution; s2, irradiating the MoS2 solution under visible light for 0.2 to 8 hours; and S3, carrying out centrifugal drying on the irradiated MoS2 solution to prepare the light treatment modified MoS2.

Description

technical field [0001] The invention relates to a light treatment modified MoS 2 Preparation method, chromium wastewater treatment method. It is suitable for the technical field of water treatment. Background technique [0002] Chromium is a typical heavy metal widely used in electroplating, tanning, textile and other industries, so it widely exists in the wastewater of these industries. Chromium usually has two oxidation states: hexavalent (Cr(VI)) and trivalent (Cr(III)), and the toxicity of hexavalent chromium is 500 times that of trivalent chromium (Z.Kwalski.,1994.Treatment of chromic tannery wastes, J. Hazard. Mater. 37, 137–144.). [0003] Molybdenum disulfide (MoS 2 ) is a well-known transition metal dichalcogenide, which is an indirect bandgap semiconductor with an energy gap of ~1.2eV, and is often used as a photovoltaic and photocatalytic material. At present, there have been studies using MoS 2 As a photocatalyst to treat Cr(VI), but this method is limited ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/06
CPCC01G39/06C02F1/30C02F2101/22C01P2004/04C01P2002/72
Inventor 陆泓波任金明王永明
Owner POWERCHINA HUADONG ENG COPORATION LTD