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Preparation method of cerium dioxide-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible-light-induced photocatalyst

A technology of ceria and bismuth oxyhalide, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of low activity, high cost, limited adsorption capacity, etc., and achieve high photocatalytic oxidation activity , Strong magnetic recovery ability, simple preparation method

Active Publication Date: 2020-09-18
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0003] There are four main methods for removing mercury: the first is adsorption, which uses activated carbon to adsorb mercury; but due to its limited adsorption capacity, it cannot be used for a long time , and the price is more expensive; moreover, activated carbon injection technology will also affect the reuse value of fly ash
The second is the catalytic oxidation method, that is, metal oxides and HCl or O 2 elemental mercury Hg 0 Catalytic oxidation to divalent mercury Hg 2+ After being removed by the absorption liquid, since this method requires an additional mercury removal device, it will increase the operating cost of the coal-fired power station, and the placement of the catalyst after use is also a problem that needs to be solved
The third method is the method using conventional pollutant removal equipment, which can remove divalent mercury Hg2+ and particulate mercury Hgp, but this method has little effect on the removal of Hg0
The fourth method is the method of using photocatalyst, which can excite and generate photogenerated electron-hole pairs e--h+ under the irradiation of visible light or ultraviolet light. Electron-hole pairs can react with oxygen or water adsorbed on the surface of the photocatalyst to generate superoxide ions·O2- or hydroxyl >·OH, so as to remove elemental mercury Hg0; but the photogenerated electron-hole pair activity is low, and the photocatalyst preparation cost is high and recovery is difficult
[0004] It can be seen that in the prior art, there are problems such as poor mercury removal effect, high cost, and complicated operation and maintenance in flue gas mercury removal methods

Method used

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  • Preparation method of cerium dioxide-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible-light-induced photocatalyst
  • Preparation method of cerium dioxide-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible-light-induced photocatalyst
  • Preparation method of cerium dioxide-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible-light-induced photocatalyst

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preparation example Construction

[0020] figure 1 It is an overall schematic flow chart of the preparation method of the ceria-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible light catalyst of the present invention. like figure 1 As shown, the preparation method of ceria-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible light catalyst of the present invention comprises the following steps:

[0021] Step 1, preparation of cobalt ferrite CoFe 2 O 4 microparticles.

[0022] Step 2, preparation of ceria-zinc oxide CeO 2 - ZnO microparticles.

[0023] Step 3, cobalt ferrite CoFe produced according to step 1 2 O 4 and the cerium dioxide-zinc oxide CeO produced in step 2 2 -ZnO, preparation of magnetic visible light catalyst ceria-zinc oxide-bismuth oxyhalide-cobalt ferrite CeO 2 -ZnO-BiOX-CoFe 2 O 4 ; Wherein, X is chlorine element, bromine element or iodine element.

[0024] In a word, the preparation method of ceria-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible li...

Embodiment

[0048] Figure 5 It is a schematic diagram of the overall structure of the experimental bench used in the embodiment of the preparation method of the ceria-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible light catalyst according to the present invention. like Figure 5 As shown, the experimental bench used in the embodiment of the present invention includes: a steel cylinder 1 used as the original flue gas source, a constant temperature water bath equipped with an elemental mercury permeation pipe to add mercury to the original flue gas source part from the steel cylinder 1 3. The mixer 4 for mixing the original flue gas with the mercury-containing flue gas, the flow meter 2 for controlling the gas flow rate of the original flue gas from the cylinder 1 to the constant temperature water bath 3 and the mixer 4, and the mixer 4 outputs Under the control of the flow meter 2, the flue gas to be treated enters the magnetic stirring water bath photocatalytic reactor 5 c...

Embodiment 1

[0052] In the first embodiment, cobalt ferrite CoFe is prepared 2 O 4 Microparticles, including the following steps:

[0053] In step A11, 0.0426 mol of Co(NO 3 ) 2 ·6H 2 O and 0.0852 mol Fe (NO 3 ) 3 ·9H 2 O was dissolved in 100 mL of deionized water and stirred uniformly to obtain a first solution containing cobalt nitrate and ferric nitrate.

[0054] Step A12: Dissolving 0.35 mol of sodium hydroxide in 100 mL of deionized water to obtain a sodium hydroxide solution.

[0055] Step A13, under the action of mechanical electric stirring, slowly adding the sodium hydroxide solution to the first solution, so that the pH value of the first solution added with sodium hydroxide is maintained between 12 and 14, and stirring continuously for 2 hours to obtain a solution, A second solution containing suspended particles of ferric hydroxide and cobalt hydroxide is obtained.

[0056] In step A14, the above-mentioned second solution is placed in a hydrothermal reaction kettle, an...

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Abstract

The invention provides a preparation method of a cerium dioxide-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible-light-induced photocatalyst. The preparation method comprises the steps: preparing cobalt ferrite magnetic micro-particles; preparing cerium dioxide-zinc oxide micro particles; according to cobalt ferrite and cerium dioxide-zinc oxide, preparing a magnetic visible light catalyst cerium dioxide-zinc oxide-bismuth oxyhalide-cobalt ferrite, wherein X is a chlorine element, a bromine element or an iodine element. The preparation method of the cerium dioxide-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible-light-induced photocatalyst is relatively simple and low in cost; moreover, the cerium dioxide-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible-light-induced photocatalyst prepared by the preparation method has the characteristics of environmental friendliness, low cost, high photocatalytic oxidation activity and the like, and can be widely applied to the field of air pollution prevention and treatment.

Description

technical field [0001] The invention relates to pollution prevention technology, in particular to a method for preparing a cerium oxide-zinc oxide-bismuth oxyhalide-cobalt ferrite magnetic visible light catalyst. Background technique [0002] At present, mercury pollution has attracted widespread attention worldwide because of its high degree of harm. In actual production and life, coal-fired power stations are the main source of anthropogenic mercury emissions. In my country, about 38% of mercury pollution is related to coal burning. Mercury in coal-fired flue gas is mainly in the form of elemental mercury Hg 0 , Divalent mercury Hg 2+ and particulate mercury Hg p Three forms exist; among them, elemental mercury Hg 0 Low melting point, volatile and insoluble in water, and divalent mercury Hg 2+ and particulate mercury Hg p Compared to elemental mercury Hg 0 Difficult to remove from fumes. [0003] There are four main ways to remove mercury: the first is adsorption,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138B01D53/86B01D53/64
CPCB01J27/138B01D53/007B01D53/8665B01D2257/602B01D2258/0283B01D2259/802B01J35/33B01J35/39Y02W10/37
Inventor 张安超周普阳张立享朱贞卫张新民张丹李海霞陈国艳
Owner HENAN POLYTECHNIC UNIV
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