Preparation method and application of activated carbon fiber-based adsorbent for removing hydrogen sulfide, hydrogen phosphide, arsenic hydride and ammonia gas

A technology of activated carbon fiber and hydrogen sulfide, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as difficult recycling, complicated operation, and inconvenient maintenance

Active Publication Date: 2021-02-19
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

However, the operation of wet removal is complicated, the investment cost is high, and it is not easy to recycle and regenerate. Although dry removal can overcome the shortcomings of wet method, the removal efficiency is low and it is easy to cause secondary pollution.
The removal methods of arsine are mainly oxidation method and thermal decomposition method, but there is also the problem of low removal efficiency
The treatment methods of ammonia gas mainly include chemical pickling method, cooling water method and pyrolysis method. Although these three methods are simple to operate, they also have certain shortcomings. Both chemical pickling method and cooling water method have the possibility of secondary pollution , the pyrolysis method has a large one-time investment, high operating costs and complicated structure, which is inconvenient for maintenance

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  • Preparation method and application of activated carbon fiber-based adsorbent for removing hydrogen sulfide, hydrogen phosphide, arsenic hydride and ammonia gas
  • Preparation method and application of activated carbon fiber-based adsorbent for removing hydrogen sulfide, hydrogen phosphide, arsenic hydride and ammonia gas
  • Preparation method and application of activated carbon fiber-based adsorbent for removing hydrogen sulfide, hydrogen phosphide, arsenic hydride and ammonia gas

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preparation example Construction

[0037] The invention provides a method for preparing an activated carbon fiber-based adsorbent for removing hydrogen sulfide, phosphine, arsine and ammonia, comprising the following steps:

[0038] (1) Carry out remote argon plasma treatment to activated carbon fibers to obtain pretreated activated carbon fibers;

[0039] (2) Ultrasonic impregnation of the pretreated activated carbon fibers in a hydrogen peroxide solution, followed by washing to neutrality to obtain modified activated carbon fibers;

[0040] (3) The modified activated carbon fiber is mixed with the copper nitrate solution, and rotated to obtain the activated carbon fiber loaded with copper salt;

[0041] (4) The activated carbon fiber loaded with copper salt is sequentially subjected to microwave muffle furnace roasting and remote oxygen plasma treatment to obtain an activated carbon fiber-based adsorbent for removing hydrogen sulfide, phosphine, arsine, and ammonia .

[0042] The invention performs remote a...

Embodiment 1

[0065] (1) Using remote argon plasma with a radio frequency power of 20W and a gas flow rate of 10cm 3 min -1 , under the condition that the distance from the discharge center is 20cm, the activated carbon fiber raw material is pretreated for 30s, and then the activated carbon fiber treated by remote argon plasma is ground and sieved to obtain 40-60 mesh pretreated activated carbon fiber;

[0066] (2) Mix the pretreated activated carbon fibers with a hydrogen peroxide solution with a concentration of 1.5 mol / L, impregnate them ultrasonically for 2 hours, where the ultrasonic frequency is 30KHz, and then dry them at 90°C for 15 hours;

[0067] (3) The impregnated activated carbon fiber is cleaned to neutrality with ultrapure water, dried at 90°C for 15h, then immersed in a copper nitrate solution in which the quality of copper is 5% of the activated carbon fiber quality, and vacuumed using a rotary evaporator Dry for 2 hours to obtain activated carbon fibers loaded with copper...

Embodiment 2

[0072] (1) Using remote argon plasma at a radio frequency power of 30W and a gas flow rate of 20cm 3 min -1 , under the condition that the distance from the discharge center is 10cm, the activated carbon fiber raw material is pretreated for 40s, and then the activated carbon fiber treated by remote argon plasma is ground and sieved to obtain 40-60 mesh pretreated activated carbon fiber;

[0073] (2) Mix the pretreated activated carbon fibers with a hydrogen peroxide solution with a concentration of 2mol / L, impregnate them ultrasonically for 2.5 hours, where the ultrasonic frequency is 25KHz, and then dry them at 100°C for 15 hours;

[0074] (3) The impregnated activated carbon fiber is cleaned to neutrality with ultrapure water, dried at 100°C for 15h, then impregnated into a copper nitrate solution in which the quality of copper is 10% of the activated carbon fiber quality, and vacuumed using a rotary evaporator Dry for 2.5h to obtain activated carbon fibers loaded with copp...

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Abstract

The invention provides a preparation method and application of an activated carbon fiber-based adsorbent for removing hydrogen sulfide, hydrogen phosphide, arsenic hydride and ammonia gas, and belongsto the technical field of air pollution prevention and control. The method comprises the following steps: firstly, carrying out remote argon plasma treatment on the activated carbon fiber, and then carrying out ultrasonic impregnation by using a hydrogen peroxide solution, so that the number of oxygen-containing functional groups such as phenolic hydroxyl, lactone and carboxyl on the surface of the activated carbon fiber is remarkably increased; modified activated carbon fibers and a copper nitrate solution are mixed and subjected to rotary evaporation, copper salt is loaded on the surfaces of the activated carbon fibers, the copper salt is converted into copper oxide after being roasted in a microwave muffle furnace, the copper oxide can serve as an active component for removing hydrogensulfide, hydrogen phosphide, arsenic hydride and ammonia gas, and therefore the removal efficiency of harmful gas is improved; the roasted activated carbon fiber is subjected to remote oxygen plasmatreatment, so that oxygen-containing functional groups on the surface of the activated carbon fiber can be enhanced, the anti-pollution performance of the activated carbon fiber-based adsorbent is improved, and the service life of the activated carbon fiber-based adsorbent is prolonged.

Description

technical field [0001] The invention relates to the technical field of air pollution prevention and control, in particular to a preparation method and application of an activated carbon fiber-based adsorbent for removing hydrogen sulfide, phosphine, arsine and ammonia. Background technique [0002] With the rapid development of synthetic ammonia, phosphorus chemical and coal chemical industries, hydrogen sulfide, phosphine, and ammonia have become air pollutants in the chemical industry with a sharp increase in content; arsine is a highly toxic substance with strong hemolytic properties , unstable at high temperature, and extremely harmful to the human body and the environment. [0003] At present, the removal methods of hydrogen sulfide and phosphine mainly include wet method and dry method. The wet method includes liquid catalytic hydrolysis methods such as sodium hypochlorite method, chlorine water method and concentrated sulfuric acid method. The dry method includes comb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01D2257/304B01D2257/406B01D2257/55B01D2257/60B01J20/205
Inventor 宁平杨薪玉李凯王驰王飞孙鑫宋辛马懿星李坤林
Owner KUNMING UNIV OF SCI & TECH
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