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Photocatalyst for halogenation reaction of organic matters and preparation method of photocatalyst

A photocatalyst, halogenation reaction technology, applied in organic chemical methods, organic halogenation, physical/chemical process catalysts, etc., can solve the problems of strong corrosion, pollution, blank and other problems, and achieve the effect of high selectivity and low energy consumption

Active Publication Date: 2013-09-11
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cl 2 、Br 2 , I 2 Etc. is the most commonly used halogenating agent. Simple halogen not only has a long production process, serious pollution, high energy consumption, but also is very dangerous; from the perspective of application, its reaction selectivity is poor, strong corrosion, and serious pollution
Therefore, it is self-evident to develop a method that directly uses alkali metal halides (hydrohalogenates) as halogenating agents to replace simple halogens to achieve related halogenation. The economic benefits, safety significance, and environmental protection significance it can bring Yes, but the relevant research and examples are still blank, and its difficulty can be seen
[0005] In addition, although there have been some studies on the application of Ag / AgCl in other fields, due to its small loading capacity, it cannot be applied to the photocatalytic reaction process of organic matter, and it cannot be used as a photocatalyst to directly utilize alkali Metal halides (hydrohalides M + x - ) for the halogenating agent to replace the elemental halogen to initiate the halogenation reaction of related organic compounds

Method used

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  • Photocatalyst for halogenation reaction of organic matters and preparation method of photocatalyst
  • Photocatalyst for halogenation reaction of organic matters and preparation method of photocatalyst
  • Photocatalyst for halogenation reaction of organic matters and preparation method of photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the preparation of nano-silver / silver chloride composite material:

[0021] Dissolve 0.167g of silver nitrate and 5.2g of potassium chloride in 10ml and 70ml of deionized water respectively, mix and stir for 30min, and finally transfer to a closed 100ml autoclave. Placed at 165° C. for 4 hours, and after cooling to room temperature, the product was collected, washed, and vacuum-dried to obtain silver chloride micro-cubes with high crystallinity and hierarchical structure.

[0022] Add the silver chloride micron cube powder to the aqueous solution in which 0.167g of silver nitrate and 0.02-0.2mol of formalin are dissolved, irradiate with a 300W xenon lamp for 30 minutes, and part of the silver chloride and silver nitrate are reduced to form silver simple substance, and finally a high-loaded Nano silver / silver chloride heterogeneous visible light photocatalytic material. The silver loading amounted to 12.8 mol%.

Embodiment 2

[0023] Embodiment 2: the preparation of nano-silver / silver chloride composite material:

[0024] Dissolve 0.255g of silver nitrate and 5.2g of potassium chloride in 10ml and 70ml of deionized water respectively, mix and stir for 30min, and finally transfer to a closed 100ml autoclave. Placed at 175° C. for 5.5 hours, after cooling to room temperature, the product was collected, washed, and vacuum-dried to obtain silver chloride micro-cubes with high crystallinity and hierarchical structure.

[0025] Add the silver chloride micron cube powder into the aqueous solution dissolved with 0.255g of silver nitrate and 0.02-0.2mol of sodium formate, illuminate with 300W xenon lamp for 35 minutes, and partially reduce the silver chloride and silver nitrate to form simple silver, and finally obtain highly loaded nano silver / silver chloride visible light photocatalytic material, the Ag load is 4.6-8.7mol%.

[0026] SEM figure and XRD figure (see Figure 1-2 Shown), the content of Ag i...

Embodiment 3

[0027] Embodiment 3: the preparation of nano-silver / silver chloride composite material:

[0028] Dissolve 0.167g of silver nitrate and 5.2g of potassium chloride in 10ml and 70ml of deionized water respectively, mix and stir for 30min, place at 165°C for 4 hours, and after cooling to room temperature, collect the product, wash and dry in vacuo , to obtain silver chloride micro-cubes with high crystallinity and hierarchical structure.

[0029] Add the silver chloride micro-cube powder to the aqueous solution in which 0.167g of silver nitrate and methyl orange are dissolved, and illuminate with a 300W xenon lamp for 30 minutes, and the silver nitrate is reduced to form simple silver, and finally a high-loaded nano-silver / silver chloride heterogeneous visible light is obtained. As a catalytic material, the loading of silver reaches 3.0-3.8mol%.

[0030] The following are examples of nano-silver / silver chloride surface plasmon composite materials used as photocatalysts, with inor...

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Abstract

The invention relates to a photocatalyst for a halogenation reaction of organic matters and a preparation method of the photocatalyst. The photocatalyst comprises a highly-loaded nano silver / silver chloride composite material, wherein the molar weight of the nano silver accounts for 3.0% to 12.8% of the total weight of the nano silver / silver chloride composite material. The photocatalyst can be applied to the halogenation reaction process of the organic matters, so that a halide ion X<-> provided by an inorganic halogen acid salt M+X<-> dissolved in a water phase can serve as a halogenating agent for the halogenation of the organic matters. Thus, the halide ion X<-> is directly converted into a halogen atom free radical under the irradiation of visible light; and a halogen substituted reaction or a halogen addition reaction of the organic matters is initiated. The photocatalyst for halogenation of the organic matters is novel, environmental-friendly, high in selectivity and low in energy consumption.

Description

technical field [0001] The invention relates to a photocatalyst for halogenation of organic matter and a preparation method thereof. Background technique [0002] The utilization of solar energy has been widely valued, such as photovoltaic energy and natural photosynthesis. Semiconductors use solar energy to split water to produce hydrogen, convert solar energy to biomass energy through photosynthesis, and trigger redox reactions, all of which are advocated by the sustainable "green life". Photocatalysis is hailed as a new way of organic chemistry in the 21st century, TiO 2 , ZnO, AgCl and their composite supported inorganic semiconductors are typical representatives of photocatalysts. Semiconductor photocatalysts based on composite nano-noble metals Ag, Au, Pt, etc., such as Ag / AgX (X=Cl, Br, I), Ag / ZnO, Ag / AgCl / TiO 2 , Ag / Ag 3 PO 4 , Au / TiO 2 , Au / ZnO, Pt / TiO2, Cu 2 O / TiO 2 etc., because the nano-metal compounded on the surface of the semiconductor material has a s...

Claims

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Application Information

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IPC IPC(8): B01J27/10C07B39/00C07C17/10C07C19/01C07C17/02C07C22/04C07C17/14C07D333/12
Inventor 刘守信张琦甄小丽刘欣伟李慧颖李军章张晓芳
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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