CN115672288B - Modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in atmosphere and preparation method thereof - Google Patents
Modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in atmosphere and preparation method thereof Download PDFInfo
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- CN115672288B CN115672288B CN202211247416.4A CN202211247416A CN115672288B CN 115672288 B CN115672288 B CN 115672288B CN 202211247416 A CN202211247416 A CN 202211247416A CN 115672288 B CN115672288 B CN 115672288B
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- 229920001778 nylon Polymers 0.000 title claims abstract description 72
- 239000004677 Nylon Substances 0.000 title claims abstract description 71
- 239000012528 membrane Substances 0.000 title claims abstract description 68
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 65
- 239000012298 atmosphere Substances 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000000243 solution Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims abstract description 4
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 4
- 239000012047 saturated solution Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims abstract description 3
- 238000002791 soaking Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 abstract description 7
- 239000002253 acid Substances 0.000 abstract description 3
- 239000003513 alkali Substances 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 abstract description 3
- 125000005843 halogen group Chemical group 0.000 abstract description 2
- 238000007654 immersion Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 235000012431 wafers Nutrition 0.000 description 5
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- NGYIMTKLQULBOO-UHFFFAOYSA-L mercury dibromide Chemical compound Br[Hg]Br NGYIMTKLQULBOO-UHFFFAOYSA-L 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OELQSSWXRGADDE-UHFFFAOYSA-N 2-methylprop-2-eneperoxoic acid Chemical class CC(=C)C(=O)OO OELQSSWXRGADDE-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 229920001281 polyalkylene Polymers 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention provides a modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in the atmosphere, which is obtained by modifying a nylon membrane by KCl saturated solution, and a preparation method of the modified nylon membrane, which comprises the following steps: s1, preparing a saturated KCl solution: adding KCl powder into deionized water, putting into a constant-temperature water bath magnetic stirrer, and stirring to obtain saturated KCl solution; s2, selecting a nylon membrane, immersing the nylon membrane in the saturated KCl solution obtained in the step S1, taking out the nylon membrane after the immersion is finished, and drying the nylon membrane to obtain the modified nylon membrane, wherein the prepared modified nylon membrane has acid and alkali resistance, high temperature resistance and strong adsorption selectivity to divalent mercury, the halogen atoms of KCL attached to the nylon membrane are attractive to the divalent mercury, air passes through the nylon membrane, divalent mercury is adsorbed on the nylon membrane, zero-valent mercury directly passes through the nylon membrane, and the modified nylon membrane is mainly used for separating and adsorbing the divalent mercury and the zero-valent mercury in the atmospheric sampling and has excellent performance in the range of normal temperature and normal pressure variation of natural environment.
Description
Technical Field
The invention relates to the technical field of adsorption materials, in particular to a modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in the atmosphere and a preparation method thereof.
Background
In recent years, along with the acceleration of industrialization process, a large amount of industrial wastewater and urban domestic sewage containing heavy metals are discharged into the environment, and serious harm is brought to the atmosphere, soil and water environment, especially human health, and the main harm to human bodies is lead, cadmium, chromium, mercury and arsenic. The divalent mercury can be removed by the desulfurization device, but the zero-valent mercury is difficult to remove by the existing pollutant control device, so that a device capable of separating the divalent mercury from the zero-valent mercury is required to be designed, and the divalent mercury and the zero-valent mercury can be recovered after being separated. At present, a plurality of methods for treating heavy metal ions, such as a chemical precipitation method, an ion exchange method and the like, but the application is limited due to the fact that a large amount of sludge is generated and secondary pollution is caused, and the membrane adsorption method has the advantages of being simple and convenient to operate, low in cost and the like. Therefore, the membrane is an important means for absorbing and purifying heavy metal ions in industrial wastewater with great potential.
Materials that can be used as membrane substrates are cellulose, polysaccharide media, polyamides and derivatives thereof, chemically modified polysulfones, ethylene copolymers, polyalkylene hydroxy methacrylates, trimethylol amides, and porous nylon membranes, glass, ceramics, etc., which have a molecular structure that more or less has reactive groups, such as hydroxyl groups, amino groups, mercapto groups, carboxyl groups, etc., that are capable of reacting chemically with spacer arms and ligands. The nylon (PA) has good film forming performance, and also has good mechanical property and chemical stability; the nylon membrane is made of nylon fibers (polyamides), is resistant to acid and alkali and various organic solvents, is resistant to heat and abrasion, has good chemical stability and mechanical property, and is uniform in pore diameter and good in air permeability. Meanwhile, nylon is easy to carry static electricity, the water absorption rate of the nylon is 1.35%, the nylon has certain hydrophobicity, and the nylon and heavy metal pollutants can be adsorbed through electrostatic interaction and hydrophobic interaction.
Disclosure of Invention
The invention mainly solves the technical problem of providing a modified nylon membrane capable of selectively separating and adsorbing divalent mercury and zero-valent mercury, which can be used for separating and adsorbing divalent mercury and zero-valent mercury in atmospheric sampling, wherein the divalent mercury is adsorbed on the nylon membrane through the nylon membrane, and the zero-valent mercury directly passes through the nylon membrane.
In order to solve the technical problems, the invention adopts the following technical scheme: a modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in the atmosphere is obtained by modifying a nylon membrane by KCl saturated solution.
The invention also aims to provide a preparation method of the modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in the atmosphere, which specifically comprises the following steps:
s1, preparing a saturated KCl solution: adding KCl powder into deionized water, putting into a constant-temperature water bath magnetic stirrer, and stirring to obtain saturated KCl solution;
s2, selecting a nylon membrane, soaking the nylon membrane in the saturated KCl solution obtained in the step S1, taking out the nylon membrane after soaking, and drying the nylon membrane to obtain the modified nylon membrane for separating bivalent mercury and zero-valent mercury in the atmosphere.
Preferably, in the step S1, KCl powder is analytically pure.
Preferably, in the step S1, the set temperature of the constant-temperature water bath magnetic stirrer is 30 ℃, the saturated concentration of the KCL solution at 30 ℃ is the optimal concentration for dipping, and the rotating speed is 800r/min.
Preferably, in the step S2, the dipping time is 12 hours.
Preferably, in the step S2, the mesh number of the nylon membrane is 8000 mesh, and 8000 mesh nylon membrane is the optimal mesh number for supporting KCL.
Preferably, in the step S2, the specific steps of drying are as follows: and placing the nylon membrane taken out after the soaking is finished on a clean iron sheet, and naturally airing.
The beneficial effects of the invention are as follows: the modified nylon membrane prepared by the invention has the advantages of acid and alkali resistance, high temperature resistance and strong adsorption selectivity to divalent mercury, the halogen atoms of KCL attached to the nylon membrane are attractive to the divalent mercury, air passes through the nylon membrane, the divalent mercury is adsorbed on the nylon membrane, and zero-valent mercury directly passes through the nylon membrane, so that the modified nylon membrane is mainly used for separating and adsorbing the divalent mercury and the zero-valent mercury in the atmospheric sampling, and has excellent performance in the range of natural environment normal temperature and normal pressure variation.
Drawings
FIG. 1 is a graph showing the adsorption result of divalent mercury on a modified nylon membrane prepared by the invention;
FIG. 2 is a graph showing the adsorption result of zero-valent mercury on the modified nylon membrane prepared by the invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Example 1
Selecting a 8000-mesh nylon membrane, shearing into a 5-mm-diameter wafer, weighing 50ml of deionized water by a glass container, placing the wafer in a constant-temperature water bath magnetic stirrer with the set temperature of 30 ℃ and the rotating speed of 800r/min, gradually adding analytically pure KCL powder to prepare a 30 ℃ saturated KCL solution, placing 2 5-mm-diameter 8000-mesh nylon wafers into the KCL solution, immersing for 12 hours, then taking out the wafer, placing the wafer on a clean iron sheet, and naturally airing to obtain the modified nylon membrane capable of selectively separating and adsorbing divalent mercury and zero-valent mercury.
The storage method of the modified nylon membrane obtained by the invention is as follows: and (5) placing the modified nylon membrane into a culture dish, and sealing and preserving the nylon membrane for later use.
The applicant carried out experiments on the modified nylon membrane obtained in example 1, the specific experimental procedures being: and nitrogen is used as carrier gas, gaseous mercury and gaseous mercury bromide are respectively introduced into an adsorption tube filled with the nylon membrane, then tail gas enters a LUMAX mercury detector for detection, and the mercury bromide is reduced into zero-valent mercury by a high-temperature reformer at 580 ℃ before detection.
The experimental results are shown in fig. 1 and 2:
as can be seen from FIGS. 1 and 2, the modified nylon membrane has a concentration of 160ng/m 3 About divalent mercury is almost completely adsorbed, and the zero-valent mercury concentration is still maintained at 260-295ng/m 3 The adsorbent can prove to be selective to bivalent mercury and can separate zero-valent mercury from bivalent mercury.
Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the invention.
Claims (6)
1. The modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in the atmosphere is characterized by being obtained by modifying a nylon membrane by KCl saturated solution, and the preparation method of the modified nylon membrane specifically comprises the following steps:
s1, preparing a saturated KCl solution: adding KCl powder into deionized water, putting into a constant-temperature water bath magnetic stirrer, and stirring to obtain saturated KCl solution;
s2, selecting a nylon membrane, soaking the nylon membrane in the saturated KCl solution obtained in the step S1, taking out the nylon membrane after soaking, and drying the nylon membrane to obtain the modified nylon membrane for separating bivalent mercury and zero-valent mercury in the atmosphere.
2. The modified nylon membrane for selectively separating divalent mercury from zero valent mercury in the atmosphere as recited in claim 1, wherein KCl powder is analytically pure in step S1.
3. The modified nylon membrane for selectively separating divalent mercury from zero-valent mercury in atmosphere according to claim 1, wherein in the step S1, the set temperature of the thermostatic water bath magnetic stirrer is 30 ℃, and the set rotational speed is 800r/min.
4. The modified nylon membrane for selectively separating divalent mercury from zero valent mercury in the atmosphere according to claim 1, wherein the soaking time in step S2 is 12 hours.
5. The modified nylon membrane for selectively separating divalent mercury from zero valent mercury in the atmosphere according to claim 1, wherein in the step S2, the mesh number of the nylon membrane is 8000 mesh.
6. The modified nylon membrane for selectively separating divalent mercury from zero valent mercury in atmosphere according to claim 1, wherein in the step S2, the specific steps of drying are as follows: and placing the nylon membrane taken out after the soaking is finished on a clean iron sheet, and naturally airing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211247416.4A CN115672288B (en) | 2022-10-12 | 2022-10-12 | Modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in atmosphere and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211247416.4A CN115672288B (en) | 2022-10-12 | 2022-10-12 | Modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in atmosphere and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115672288A CN115672288A (en) | 2023-02-03 |
| CN115672288B true CN115672288B (en) | 2024-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211247416.4A Active CN115672288B (en) | 2022-10-12 | 2022-10-12 | Modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in atmosphere and preparation method thereof |
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|---|---|
| CN (1) | CN115672288B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06296841A (en) * | 1993-04-20 | 1994-10-25 | Ube Ind Ltd | Porous membrane whose surface is treated with modified nylon |
| EP0767701A1 (en) * | 1994-06-29 | 1997-04-16 | Minnesota Mining And Manufacturing Company | Composite articles for separating mercury from fluids |
| CN1559668A (en) * | 2004-03-11 | 2005-01-05 | 上海交通大学 | Electrochemical regeneration method of flue gas demercury adsorbing material |
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| CN112844301A (en) * | 2020-12-29 | 2021-05-28 | 南京大学 | Dimer carboxyl adsorbent and preparation method and application thereof |
-
2022
- 2022-10-12 CN CN202211247416.4A patent/CN115672288B/en active Active
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| JPH06296841A (en) * | 1993-04-20 | 1994-10-25 | Ube Ind Ltd | Porous membrane whose surface is treated with modified nylon |
| EP0767701A1 (en) * | 1994-06-29 | 1997-04-16 | Minnesota Mining And Manufacturing Company | Composite articles for separating mercury from fluids |
| CN1559668A (en) * | 2004-03-11 | 2005-01-05 | 上海交通大学 | Electrochemical regeneration method of flue gas demercury adsorbing material |
| CN101293196A (en) * | 2008-06-19 | 2008-10-29 | 同济大学 | Watersoluble polyurethane adsorption agent containing sulfhydryl group for removing hydrargyrum and preparation method thereof |
| CN102221489A (en) * | 2010-04-15 | 2011-10-19 | 中国科学院城市环境研究所 | Method and device for combined collection of trace level mercury species in atmosphere |
| CN103657332A (en) * | 2013-11-26 | 2014-03-26 | 江苏雄越石油机械设备制造有限公司 | Filter screen for absorbing gas phase mercury ions |
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