Method for removing zero-valent mercury and arsenic hydride through cooperation of magnetic field and photocatalytic oxidation

A technology of photocatalytic oxidation and zero-valent mercury, which is applied in the field of flue gas purification, can solve the problems of low utilization rate of catalyst sunlight, low efficiency of photocatalytic zero-valent mercury, and low catalytic removal efficiency, so as to reduce competitive adsorption and reduce adsorption The effect of competition, simplicity of structure

Active Publication Date: 2020-12-11
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of low solar energy utilization limits its wide application in the field of gas purification.
[0004] At present, the photocatalyst prepared by the traditional sol-gel method is used to catalyze the oxidation of zero-valent mercury. Due to the wide band gap of the photocatalyst, the catalyst itself has a low utilization rate of sunlight, which makes the photocatalytic zero-valent mercury inefficient; The removal of hydrogen is mainly the method of thermal catalytic oxidation, and the catalytic removal efficiency is not high; so far, there is no report on the removal of zero-valent mercury and arsine in gases by magnetic field synergistic photocatalytic oxidation

Method used

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  • Method for removing zero-valent mercury and arsenic hydride through cooperation of magnetic field and photocatalytic oxidation
  • Method for removing zero-valent mercury and arsenic hydride through cooperation of magnetic field and photocatalytic oxidation
  • Method for removing zero-valent mercury and arsenic hydride through cooperation of magnetic field and photocatalytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Catalytic oxidation of arsine and zero-valent mercury by modified titanium dioxide assisted by an external magnetic field, the steps are as follows:

[0027] 1. Catalyst preparation

[0028] Weigh 21mL of absolute ethanol and place it in a beaker, place the beaker in a magnetic stirrer and continue stirring, add 7mL of butyl phthalate, continue stirring for 30min, then add 1.5mL acetylacetone and continue stirring for 30min to obtain a uniformly stirred mixed solution A , Dissolve 0.2525g of ferric nitrate and 0.3234g of nickel nitrate in 5mL of distilled water, add 10mL of absolute ethanol and 1mL of nitric acid to prepare solution B, put solution B in a separatory funnel drop by drop into solution A, use nitric acid or Adjust the pH to 6 with ammonia water, raise the temperature to 70°C and continue to stir until it reaches a gel state. After drying the gel in an oven at 80°C for 12 hours, put the material in a muffle furnace and bake it at 400°C to obtain ...

Embodiment 2

[0032] Embodiment 2: The method for removing zero-valent mercury and arsine by this magnetic field cooperative photocatalytic oxidation is as follows:

[0033] 1. Commercially purchased bismuth oxide (Bi2O3), lanthanum nitrate, iron nitrate nonahydrate, prepared Fe by impregnation method 2 o 3 -NiO / Bi 2 o 3 Composite catalyst; the specific preparation method is: prepare 3g of catalyst, active components NiO and Fe 2 o 3 The theoretical loading amount of each is 3wt% (mass fraction), and the precursor nickel nitrate hexahydrate Ni(NO 3 ) 2 ·6H 2 O and ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O), put it in a beaker, add 5mL of deionized water to the beaker, stir it with a glass rod to dissolve it completely, weigh 2.82g of commercially available bismuth oxide and add it to the above solution, continue to stir for 20min, put the solution on the ultrasonic Ultrasonic for 60min, then placed in a water bath and heated at 60°C for 2h to obtain a solid mixture; put the m...

Embodiment 3

[0036] Embodiment 3: The method for removing zero-valent mercury and arsine by this magnetic field cooperative photocatalytic oxidation is as follows:

[0037] 1. Prepare titanium dioxide gel by sol-gel method: use tetrabutyl titanate as raw material, add water, glacial acetic acid, and absolute ethanol to tetrabutyl titanate and mix well to obtain a gel, in which water and titanic acid The molar ratio of butyl ester is 3:1; the molar ratio of glacial acetic acid to butyl titanate is 0.5:1; the molar ratio of absolute ethanol to butyl titanate is 20:1, and the prepared gel is dried, Grinding into powder, using the impregnation method to load 0.2525g ferric nitrate and 0.2522g cerium nitrate on the surface of dried 1.8g titanium dioxide to obtain a titanium dioxide catalyst loaded with Fe and Ce, and press it through a 40-60 mesh sieve;

[0038] 2. If figure 2 As shown, the gas-solid photocatalytic device is the same as in Example 1, except that the magnetic field generator i...

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Abstract

The invention provides a method for removing zero-valent mercury and arsenic hydride through cooperation of magnetic field and photocatalytic oxidation. According to the method, a magnetic field generator is arranged on a gas-solid photocatalysis device, gas containing the zero-valent mercury and the arsenic hydride is treated in the presence of a magnetic field, illumination and a catalyst, and by utilizing the magnetic difference of the gas and the influence of the magnetic field on the catalyst, arsenic hydride and zero-valent mercury are catalytically oxidized by the catalyst, so that thepurpose of improving the photocatalytic efficiency is achieved, and the removal of the zero-valent mercury and the arsenic hydride and the collection and utilization of CO raw material gas are achieved; an external magnetic field and light are combined to generate a coupling effect, combination of photo-induced electrons and holes is inhibited, the existence time and the yield of hydroxyl radicalson the surface of the catalyst and the oxidation efficiency of oxygen are improved, so that the catalytic oxidation arsenic and mercury removal efficiency of the catalyst is improved, and the methodis simple, easy to implement, low in cost, low in energy consumption and capable of achieving resource utilization of waste gas.

Description

technical field [0001] The invention relates to a method for removing arsine and zero-valent mercury by enhancing gas-solid phase photocatalytic oxidation by applying an external magnetic field, and belongs to the field of flue gas purification. Background technique [0002] my country is a major producer of phosphorus chemical industry, and the output of yellow phosphorus accounts for 80% of the world's output. Due to the relatively immature technology for producing yellow phosphorus, there are still problems of high pollution and high energy consumption in the production process. About 2500-3000m3 produced per ton of yellow phosphorus 2 Exhaust gas, while the composition of yellow phosphorus tail gas is complex, with a CO content of 80-95%, O 2 Accounting for 1%, H 2 O accounts for 5%, mercury 40-400μg / m 3 , arsenic 50-180mg / m 3 , where mercury is represented as gaseous zerovalent mercury (Hg 0 ) form, arsenic mainly in the form of arsine hydrogen (AsH 3 ) exists in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/00B01D53/46B01D53/64B01J23/755B01J23/83B01J23/843
CPCB01D53/8665B01D53/8671B01D53/007B01D53/00B01J23/002B01J23/755B01J35/004B01J23/8437B01J23/83B01D2257/553B01D2257/602B01D2258/0283B01D2259/814B01D2259/804B01D2255/802
Inventor 王学谦张航宁平王郎郎谢怡冰刘敬业
Owner KUNMING UNIV OF SCI & TECH
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