Composite magnetic visible light photocatalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite and preparation method thereof

A composite magnetic and bismuth oxyhalide technology, applied in the field of environmental pollution prevention and control, can solve the problems of low mercury removal efficiency from flue gas, weak catalytic activity, long reaction time, etc. The effect of mercury removal cost

Active Publication Date: 2017-05-31
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Most of the existing widely used visible light catalysts are single-component structures, such as simple Ag, single-component AgX (X=Cl, Br, I) or single-component BiOX (X=Cl, Br, I), The photogenerated electron-hole pairs generated by single-component visible light catalysts under visible light irradiation are easy to recombine, resulting in weak catalytic activity, long photocatalytic reaction time, and low efficiency of mercury removal from flue gas. At the same time, the cost of existing visible light catalysts High and difficult to recycle

Method used

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  • Composite magnetic visible light photocatalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite and preparation method thereof
  • Composite magnetic visible light photocatalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite and preparation method thereof
  • Composite magnetic visible light photocatalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A composite magnetic visible light catalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite, composed of Ag, AgCl, BiOCl and CoFe 2 o 4 Composition, CoFe 2 o 4 , the weight ratio of AgCl and BiOCl is:

[0044] CoFe 2 o 4 : AgCl: BiOCl=1:1:1, the weight ratio of Ag to AgCl is 0.1%~2%.

[0045] The preparation method of the above composite magnetic visible light catalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite, which includes the following process steps:

[0046] 1. Preparation of magnetic microparticles CoFe 2 o 4

[0047] (1), 0.042 mol of Co (NO 3 ) 2 ·6H 2 O and 0.084mol Fe (NO 3 ) 3 9H 2 O was dissolved in 100mL of deionized water and stirred uniformly to obtain a mixed solution A of cobalt nitrate and ferric nitrate;

[0048] (2) Dissolve 0.34 mol of sodium hydroxide in 100 mL of deionized water to obtain solution B;

[0049] (3) Slowly add solution B to solution A to adjust the pH value of solution A, so that the pH value of the ...

Embodiment 2

[0063] A composite magnetic visible light catalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite, composed of Ag, AgCl, BiOCl and CoFe 2 o 4 Composition, CoFe 2 o 4, the weight ratio of AgCl and BiOCl is:

[0064] CoFe 2 o 4 : AgCl: BiOCl=1:5:10, the weight ratio of Ag to AgCl is 2%~5%.

[0065] The preparation method of the above composite magnetic visible light catalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite, which includes the following process steps:

[0066] 1. Preparation of magnetic microparticles CoFe 2 o 4

[0067] (1), 0.042 mol of Co(NO 3 ) 2 ·6H 2 O and 0.084 mol of Fe(NO 3 ) 3 9H 2 O was dissolved in 100mL of deionized water and stirred uniformly to obtain a mixed solution A of cobalt nitrate and ferric nitrate;

[0068] (2) Dissolve 0.34 mol of sodium hydroxide in 100 mL of deionized water to obtain solution B;

[0069] (3) Slowly add solution B to solution A to adjust the pH value of solution A, so that the pH value of the ...

Embodiment 3

[0083] A composite magnetic visible light catalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite, composed of Ag, AgCl, BiOCl and CoFe 2 o 4 Composition, CoFe 2 o 4 , the weight ratio of AgCl and BiOCl is:

[0084] CoFe 2 o 4 :AgCl:BiOCl=1:1:7, the weight ratio of Ag to AgCl is 2%~3%.

[0085] The preparation method of the above composite magnetic visible light catalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite, which includes the following process steps:

[0086] 1. Preparation of magnetic microparticles CoFe 2 o 4

[0087] (1), 0.042 mol of Co (NO 3 ) 2 ·6H 2 O and 0.084mol Fe (NO 3 ) 3 9H 2 O was dissolved in 100mL of deionized water and stirred uniformly to obtain a mixed solution A of cobalt nitrate and ferric nitrate;

[0088] (2) Dissolve 0.34 mol of sodium hydroxide in 100 mL of deionized water to obtain solution B;

[0089] (3) Slowly add solution B to solution A to adjust the pH value of solution A, so that the pH value of the solu...

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Abstract

The invention provides a composite magnetic visible light photocatalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite and a preparation method thereof. The invention provides a recoverable magnetic visible light photocatalyst Ag-AgX-BiOX-CoFe2O4 (X is Cl or Br or I); the catalyst is formed by compounding simple substances Ag, AgX (X is Cl or Br or I), BiOX (X is Cl or Br or I) and CoFe2O4. Multiple ingredients are coupled, so that the effective separation of photo-induced electron hole pairs is facilitated; many strong oxidizing substances can be generated, so that the oxidization activity of the visible light photocatalyst can be enhanced; through the doping of a magnetic carrier of CoFe2O4, the visible light photocatalyst has the sufficient strong magnetic recovery capability; the multi-time circulation use can be realized, so that the smoke gas demercuration cost can be reduced; the environment-friendly performance of the visible light photocatalyst is improved.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of environmental pollution prevention and control, and specifically relates to a composite magnetic visible light catalyst silver-silver halide-bismuth oxyhalide-cobalt ferrite and a preparation method thereof. [0003] Background technique: [0004] Mercury has caused great harm to the ecological environment and human health due to its high toxicity, persistence, bioaccumulation and atmospheric long-distance transport. Coal combustion is considered a major source of atmospheric mercury. Since my country's energy production structure is dominated by coal, my country's total coal consumption in 2014 was about 3.5 billion tons of standard coal, and the proportion of coal in the primary energy consumption structure remained at about 60%, although the average mercury content in coal in my country was only There is 0.22mg / kg, but due to the huge coal consumption, the impact of mercury emitted in coal combu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/128B01D53/86B01D53/64
CPCB01D53/8665B01D2258/0283B01J27/128B01J35/0033B01J35/004
Inventor 张安超张立享路好王华万剑峰朱崎峰王发辉刘志超
Owner HENAN POLYTECHNIC UNIV
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