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Preparation method of bismuth oxychloride composite magnetic photocatalyst

A composite magnetic and photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of narrow band gap, difficult recycling and low photocatalytic efficiency of bismuth oxychloride composite magnetic photocatalyst and other problems, to achieve the effect of low cost, simple operation and less equipment

Inactive Publication Date: 2016-02-03
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to address the problems of low photocatalytic efficiency and difficult recovery of existing BiOCl, and propose a method for preparing a bismuth oxychloride composite magnetic photocatalyst. The prepared bismuth oxychloride composite magnetic photocatalyst has a narrow band gap and can respond to visible light , has high photocatalytic efficiency under simulated sunlight irradiation, and the preparation process is simple, the production cost is low, and the cycle is short. In addition, it is also easy to separate and recover from the liquid suspension system by applying an external magnetic field, which is simple and efficient. It not only improves the reuse of resources, but also avoids the possible secondary pollution caused by the catalyst.

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Embodiment 1

[0025] A kind of preparation method of bismuth oxychloride composite magnetic photocatalyst, concrete steps are as follows:

[0026] (1) Preparation of manganese zinc ferrite

[0027] Take by weighing 1.91g zinc sulfate, 2.77g manganese sulfate, 14.57g ferric chloride hexahydrate, add water and dissolve to obtain solution, then add zinc sulfate solution and ferric chloride solution in manganese sulfate solution, fully stir to obtain mixed solution; weigh 16.40g g ammonium oxalate was dissolved in water to obtain ammonium oxalate solution. The mixed solution and the ammonium oxalate solution were heated to 80° C. under water bath conditions, and then the mixed solution was slowly added dropwise to the ammonium oxalate solution, and the pH value was adjusted to 7 with ammonia water. Aging the obtained oxalate precipitate at room temperature for 12 hours, filtering, washing and drying, and finally placing it in a muffle furnace and roasting at 1200°C for 3 hours to obtain mangan...

Embodiment 2

[0033] A kind of preparation method of bismuth oxychloride composite magnetic photocatalyst, concrete steps are as follows:

[0034] (1) with embodiment 1;

[0035] (2) Weigh 4.85g of bismuth nitrate pentahydrate and add it to 20mL of dilute nitric acid (concentration: 4mol / L), and magnetically stir for 30min to obtain a transparent solution A. The mass ratio of manganese zinc ferrite and bismuth oxychloride is 15:100 Weigh an appropriate amount of manganese zinc ferrite, 0.58g of sodium chloride and 0.05g of sodium dodecylbenzene sulfonate, add them to 120ml of water, stir mechanically for 30min to obtain solution B, slowly add solution A dropwise into solution B and stir 30min, adjust the pH to 2.5 with sodium hydroxide solution (concentration: 2mol / L), heat in a water bath at 80°C and mechanically stir for 2h to obtain the precursor of the gray composite magnetic photocatalyst;

[0036] (3) The composite magnetic photocatalyst precursor was washed with distilled water and ...

Embodiment 3

[0038] A kind of preparation method of bismuth oxychloride composite magnetic photocatalyst, concrete steps are as follows:

[0039] (1) with embodiment 1;

[0040] (2) Weigh 4.85g of bismuth nitrate pentahydrate and add it to 20mL of dilute nitric acid (concentration: 4mol / L), and stir magnetically for 30min to obtain a transparent solution A. The mass ratio of manganese zinc ferrite and bismuth oxychloride is 17:100 Weigh an appropriate amount of manganese zinc ferrite, 0.58g of sodium chloride and 0.05g of sodium dodecylbenzene sulfonate, add them to 120ml of water, stir mechanically for 30min to obtain solution B, slowly add solution A dropwise into solution B and stir For 30 minutes, adjust the pH to 2 with sodium hydroxide solution (concentration: 2mol / L), heat in a water bath at 80°C and mechanically stir for 4 hours to obtain the precursor of the gray composite magnetic photocatalyst;

[0041] (3) The composite magnetic photocatalyst precursor was washed with distille...

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Abstract

The invention relates to a preparation method of a bismuth oxychloride composite magnetic photocatalyst and belongs to the field of an inorganic catalytic material. According to the preparation method, firstly, a precursor of the bismuth oxychloride / manganese zinc ferrite composite magnetic photocatalyst is prepared by adopting an impregnation method; then the product is obtained by filtration, washing, drying and calcinations. The method disclosed by the invention adopts a simple preparation process, is short in preparation period, is low in production cost, is low in calcinations temperature and is energy-saving. The bismuth oxychloride composite magnetic photocatalyst prepared by the preparation method has a narrow band gap, is high in photocatalysis activity, reaches a degradation rate of 99.6 percent for 10mg / L of rhodamine B solution in 30min in the simulated sunlight, and is easy to recycle; after the composite magnetic photocatalyst is used repeatedly for three times, the degradation rate for rhodamine B is still higher than 95 percent in 30min. The product prepared by the preparation method can be widely used in the field of photocatalysis degradation of organic pollutants.

Description

technical field [0001] The invention relates to a preparation method of bismuth oxychloride composite magnetic photocatalyst, which belongs to the technical field of inorganic environment-friendly photocatalytic materials. Background technique [0002] Titanium dioxide (TiO 2 ) and other traditional photocatalytic materials have a wide band gap, and there are limitations in the use of visible light, which limits their application and development. The focus of the research. Due to its unique layered structure, BiOCl has enough space to polarize the corresponding atoms and their orbitals, thereby generating induced dipole moments, which can effectively separate electron-hole pairs; The electrons must pass through a certain k layer to migrate to the valence band, which reduces the recombination rate of photogenerated electron-hole pairs. Therefore, BiOCl has high photocatalytic activity and stability, and has become a hotspot in the research of photocatalytic materials. [...

Claims

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Application Information

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IPC IPC(8): B01J27/08C02F1/30
CPCY02W10/37
Inventor 徐龙君冯姗刘成伦杜海刚朱倩倩
Owner CHONGQING UNIV
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