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Macroporous skeleton hydrophobic mercury removal material, preparation method and application thereof

A hydrophobic material, hydrophobic technology, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve problems such as hindering the reuse of fly ash production raw materials, waste of metal sulfide design capacity, low adsorption capacity and rate, etc. problems, to achieve the effect of reducing resistance, avoiding secondary pollution, and high adsorption rate

Active Publication Date: 2021-06-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the activated carbon injection technology has the following defects: (1) Hg 0 Low adsorption capacity and rate, high cost; (2) It hinders the reuse of fly ash as a raw material for concrete production; (3) When mercury-containing activated carbon is dumped and landfilled, it is very likely to emit Hg again 0
However, the cost of preparing metal sulfides may be twice as high as that of activated carbon, and the metal sulfides studied before are all in the form of powders. If used in spray mercury removal technology, the contact time between the adsorbent and the flue gas is generally less than 5 s , more than 99% of the metal sulfide design capacity may be wasted in subsequent processing steps, and the direct use of the powder in a fixed bed facility will result in a drop in flue gas pressure
Furthermore, considering the Hg absorbed by WFGD and WESP 2+ Easily reduced to Hg 0 , while some flue gas treatment systems do not install fixed bed facilities behind these devices

Method used

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  • Macroporous skeleton hydrophobic mercury removal material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Set the density to 27 kg / m 3 , 10 blocks with a volume of 1 cm 3 After soaking the polyurethane sponge (PUF) in 50 mL of deionized water, 0.625 mmol of ammonium sulfide solution (mass fraction 20%) was added, that is, the feeding ratio of ammonium sulfide to macroporous skeleton hydrophobic material was 1:16 (mmol / cm 3 ), then add cetyltrimethylammonium bromide whose mass is 1% of the mass of ammonium sulfide, and stir for 1 h to obtain a mixed solution.

[0028] (2) Add 25 mL of 0.025 mol / L copper sulfate solution dropwise into the mixed solution obtained in step (1), stir vigorously for 2 h, and then take out the treated polyurethane sponge.

[0029] (3) Wash the treated polyurethane sponge taken out in step (2) with deionized water and absolute ethanol for 30 min each, then vacuum-dry at 80 °C for 10 h, and the obtained sample is designated as 16CuS@PUF.

[0030] Take 3 cm 3 The 16CuS@PUF was placed in a cylindrical quartz glass fixed-bed reactor with a leng...

Embodiment 2

[0032] Without adding polyurethane sponge, prepare copper sulfide powder, namely:

[0033] (1) Add 0.625 mmol of ammonium sulfide solution (20% by mass fraction) to 50 mL of deionized water, then add cetyltrimethylammonium bromide whose mass is 1% of the mass of ammonium sulfide, and stir for 1 h. A mixed solution was obtained.

[0034] (2) Add 25 mL of 0.025 mol / L copper sulfate solution dropwise into the mixed solution obtained in step (1), and stir vigorously for 2 h.

[0035] (3) The precipitate obtained in step (2) was washed with deionized water and absolute ethanol, and dried in vacuum at 80 °C for 10 h, and the obtained sample was designated as CuS.

[0036] Test the water contact angle between CuS and 16CuS@PUF, the results are as follows figure 1 As shown, the water contact angle of CuS powder is only about 37°, and the water contact angle of 16CuS@PUF can reach about 113°.

[0037] Take 0.042 g CuS and 7 cm 3 The 16CuS@PUF (theoretically loaded up to 0.042 g CuS) ...

Embodiment 3

[0039] (1) Set the density to 23 kg / m 3 , 10 blocks with a volume of 1 cm 3 After soaking polyethylene foam (PE) in 50 mL deionized water, add 10 mmol ammonium sulfide solution (mass fraction 20%), that is, the feeding ratio of ammonium sulfide to macroporous skeleton hydrophobic material is 1:1 (mmol / cm 3 ), then add dodecyltrimethylammonium chloride whose mass is 5% of the mass of ammonium sulfide, and stir for 2 h to obtain a mixed solution.

[0040] (2) Add 25 mL of 0.4 mol / L zinc sulfate solution dropwise into the mixed solution obtained in step (1), stir vigorously for 1 h, and then take out the treated polyethylene foam.

[0041] (3) The treated polyethylene foam cotton taken out in step (2) was washed with deionized water and absolute ethanol for 20 min each, and then vacuum-dried at 60°C for 12 h, and the obtained sample was designated as ZnS@PE. The zinc sulfide powder sample prepared without adding polyethylene foam cotton is denoted as ZnS.

[0042] take 5 cm ...

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Abstract

The invention discloses a macroporous skeleton hydrophobicmercury removal material, a preparation method and application thereof. A simple one-step precipitation method is adopted, a surfactant is used for regulating and controlling the crystal size of metal sulfide, the metal sulfide is fixed on a macroporous skeleton hydrophobic material, and a novel mercury removal material is obtained. The preparation method of the macroporous skeleton hydrophobic mercury removal material is simple, the contact area of metal sulfide minerals and mercury is increased, and the resistance of an adsorbent to flue gas is reduced. The macroporous framework hydrophobic mercury removal material has extremely high mercury adsorption capacity and adsorption rate, the hydrophobic performance of pure metal sulfide is improved, and the obtained mercury removal material can be used as a mercury removal medium to be applied to a fixed bed or a liquid phase (such as a wet dust removal device) to be in contact with gaseous elemental mercury; and volatile gaseous elemental mercury is converted into stable solid mercuric sulfide, and the material has the advantages of being flexible in application, high in efficiency, environmentally friendly and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution prevention and purification, and specifically relates to a macroporous framework hydrophobic type mercury removal material, a preparation method and an application thereof. Background technique [0002] Mercury is a highly toxic persistent pollutant. According to the Global Mercury Assessment Report released by the United Nations Environment Program in 2018, coal combustion is the largest source of mercury emissions from human activities, with an annual mercury emission of 292 tons. Forms of mercury from coal combustion include: elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ) and particulate mercury (Hg p ), among them, Hg 2+ and Hg p It can be removed from flue gas by air pollutant control devices (APCDs), such as electrostatic precipitators (ESP), wet flue gas desulfurization plants (WFGD) and wet electric precipitators (WESP). On the contrary, Hg 0 Due to its high vo...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/02B01J20/30B01D53/02
CPCB01J20/26B01J20/0285B01D53/02B01D2257/602
Inventor 李海龙杨泽群杨琴
Owner CENT SOUTH UNIV
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