Two-dimensional catalytic material and preparation and application thereof

A technology of catalytic materials and two-dimensional materials, which is applied in the field of two-dimensional catalytic materials and their preparation and application, can solve problems such as fragility and difficult material recovery, and achieve convenient separation and recovery, high separation and recovery efficiency, good mechanical properties and The effect of structural stability

Inactive Publication Date: 2021-06-15
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of waste of internal structure, low mass transfer efficiency of particle-type carrier ozone catalyst in the existing ozone catalytic oxidation technology, and the need for additional separation / recovery units for powder-type ozone catalyst, the present invention provides a new type of two-dimensional catalytic The material is a light-weight and flexible two-dimensional transition metal foil with a high specific surface area as the base material, which is loaded with an ozone catalytic active metal component and / or a non-metallic active component, with a high specific surface area and high roughness , light weight and flexibility, etc., can solve the existing problems of difficult material recovery and easy breakage, and have high mass transfer efficiency

Method used

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  • Two-dimensional catalytic material and preparation and application thereof
  • Two-dimensional catalytic material and preparation and application thereof
  • Two-dimensional catalytic material and preparation and application thereof

Examples

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preparation example Construction

[0129] Fabrication of hole arrays on the surface of transition metal foils

[0130] Any existing technology can be used to form a hole array (nano-scale and / or micron-scale pores) on the surface of the transition metal foil, for example, the publication (announcement) number: CN103402908B publication (announcement) date: 2016.08.31 patent The document discloses methods for producing highly ordered nanopillar or nanopore structures over large areas, such as anodization.

[0131] In some embodiments, after the "transition metal foil with concave-convex stripes on the surface" is treated by a conventional anodic oxidation method, nanoscale and / or micron array of apertures.

[0132] In some embodiments, the transition metal foil is used as the anode to connect to the positive electrode of the external power supply and placed in the electrolyte solution. The cathode can be selected from Pt sheet, titanium plate, stainless steel, stone grinding rod, etc., which are not easy to reac...

Embodiment 1

[0140] In this example, an aluminum foil with a thickness of 200 μm is selected as the basic material for the preparation of a two-dimensional base material. The surface before polishing is as follows figure 1 a; the specific steps are as follows:

[0141] 1) Pretreatment: The aluminum foil (upper and lower surfaces) is pretreated by degreasing, grinding, wire drawing, and washing. Acetone solution is used for degreasing, and ethanol and deionized water are used for cleaning. After completion, dry it in an oven at 50°C for later use. The comparison picture after treatment is shown in 1b;

[0142] 2) Anodizing: use titanium plate as cathode, pretreated aluminum foil as anode, 50g / L oxalic acid solution (take 300ml) as corrosion electrolyte, and the reaction of corrosion electrolyte in the process of anodization The container has been placed in an ice-water bath, and the temperature is kept at 10±1°C; during anodic oxidation treatment, the distance between the positive and neg...

Embodiment 2

[0156] In this embodiment, a two-dimensional transition metal tin foil with a thickness of 300 μm and concave-convex stripes (the stripe width is about 60nm, the stripe depth is 4nm, and the stripe spacing is 60nm) is selected as the base material for the preparation of the base material. The steps are as follows:

[0157]1) Pretreatment: The two sides of the tin foil are pretreated by degreasing, grinding, drawing, and washing. Acetone solution is used for degreasing, and ethanol and deionized water are used for cleaning. After completion, dry it in a 50°C oven for later use;

[0158] 2) Anodizing: use titanium plate as cathode, pretreated tin foil as anode, 150g / L sulfuric acid solution (take 300ml) as corrosion electrolyte, and a reaction vessel with corrosion electrolyte in the process of anodization Keep it in an ice-water bath and keep the temperature at 10±1°C; during anodic oxidation treatment, the distance between the positive and negative electrodes is 1cm, the volta...

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Abstract

The invention discloses a two-dimensional catalytic material and preparation and application thereof. The two-dimensional catalytic material is characterized in that a transition metal foil with the micron-order thickness serves as a base material, a two-dimensional matrix carrier with light weight, flexibility, high specific surface area and roughness is prepared through pretreatment, anodic oxidation, acid etching regulation and control, hole breaking and thermal stabilization treatment, and on the basis of the carrier, the two-dimensional ozone catalytic material is prepared by taking metal salt and/or organic matter as a precursor and adopting vacuum impregnation, in-situ deposition and thermal reduction technologies to load active metal and/or non-metal active components in situ. The two-dimensional material has the advantages of high specific surface area, high roughness, high mechanical strength, light weight, flexibility and the like; when applied to water treatment, the catalytic material has the advantages of rapid interface mass transfer, excellent catalytic performance and the like; and meanwhile, the preparation process of the two-dimensional catalytic material has the characteristics of simple method, easiness in adjustment of process parameters, easiness in large-scale production, low preparation cost and the like.

Description

technical field [0001] The invention belongs to the field of material preparation and application, and more specifically relates to a two-dimensional catalytic material and its preparation and application. Background technique [0002] As a kind of advanced oxidation technology, heterogeneous ozone catalytic oxidation technology has the advantages of fast reaction, clean product, strong oxidation ability, weak selectivity, no secondary pollution, and no need to continuously add catalyst. It is an effective wastewater treatment method. processing technology. However, the existing heterogeneous ozone catalytic oxidation technology still has problems such as insufficient catalytic performance of the catalyst, poor interface activity, and low wastewater treatment efficiency, especially for wastewater with low pollutant concentration and poor mass transfer. major bottleneck. The most widely used heterogeneous ozone catalysts so far are granular catalysts (such as alumina-based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J23/14B01J23/72B01J23/75B01J23/755B01J23/889B01J35/02B01J35/06B01J35/10B01J37/00B01J37/02B01J37/34C02F1/72C02F1/78B01D53/86
CPCB01J37/348B01J37/0207B01J35/1014B01J23/8892B01J35/1009B01J23/755B01J37/0018B01J23/75B01J21/04B01J23/72B01J23/14B01J35/02B01J35/06C02F1/78C02F1/725B01D53/86B01D2251/104
Inventor 魏卡佳王陆韩卫清刘思琪刘润戴君诚
Owner NANJING UNIV OF SCI & TECH
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