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Preparation method and application of trivalent chromium ion imprinted composite membrane

A technology of ion imprinting and trivalent chromium, applied in the field of membrane separation, can solve the problems of lack of target specific selectivity and limited application of analogues with similar molecular weight and volume, achieve the effect of improving adsorption capacity and overcoming preparation difficulties

Inactive Publication Date: 2019-10-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional membranes lack specific selectivity to target objects for analogues with similar molecular weight and volume, which greatly limits its application in various fields.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add 10mmol / L CrCl 3 Dissolve in the mixed porogenic solvent of organic solvent (acetonitrile) and water with a volume ratio of 1:1, then add the functional monomer 2-vinylpyridine, place it in a constant temperature shaker for 3 hours at room temperature, add ethylene glycol Alcohol dimethacrylate and azobisisobutyronitrile, fully dissolved and shaken, ultrasonically degassed and deoxygenated for 10 minutes to form a pre-polymerization solution; where CrCl 3 , 2-vinylpyridine and ethylene glycol dimethacrylate molar ratio is 1:2:20, azobisisobutyronitrile and CrCl 3 The molar ratio is 1:10.

[0020] (2) Put the polytetrafluoroethylene film in the pre-polymerization solution of the above step, soak it at room temperature for 3 minutes, take it out and place it between two glass plates, then react it at 80°C for 24 hours, and finally use 150mL volume ratio of 9 :1 mixed solution of methanol and acetic acid eluted to remove trivalent chromium ions loaded on the polyt...

Embodiment 2

[0023] (1) Add 20mmol / L CrCl 3 Dissolve in the mixed porogenic solvent of organic solvent (methanol) and water with a volume ratio of 1:1, then add the functional monomer 2-vinylpyridine, place it in a constant temperature shaker at room temperature for 2 hours, add ethylene glycol Alcohol dimethacrylate and azobisisobutyronitrile, fully dissolved and shaken, ultrasonically degassed and deoxygenated for 10 minutes to form a pre-polymerization solution; where CrCl 3 , 2-vinylpyridine and ethylene glycol dimethacrylate molar ratio is 1:4:20, azobisisobutyronitrile and CrCl 3 The molar ratio is 5:2.

[0024] (2) Place the Nylon-6 membrane in the pre-polymerization solution of the above step, soak it at room temperature for 1 min, take it out and place it between two glass plates, and then react it at 60°C for 36 h, and finally use 150 mL with a volume ratio of 9: 1 mixed solution of methanol and acetic acid to remove the trivalent chromium ions loaded on the Nylon-6 membrane to...

Embodiment 3

[0027] (1) Add 100mmol / L CrCl 3 Dissolve in the mixed porogenic solvent of organic solvent (N-N-dimethylformamide) and water with a volume ratio of 1:1, then add the functional monomer 2-vinylpyridine, and place it in a shaking table at room temperature for constant temperature reaction 2.5h, add ethylene glycol dimethacrylate and azobisisobutyronitrile, fully dissolve and shake well, ultrasonically degas and deoxygenate for 10min to form a pre-polymerization solution; where CrCl 3 , 2-vinylpyridine and ethylene glycol dimethacrylate molar ratio is 1:8:50, azobisisobutyronitrile and CrCl 3 The molar ratio is 2:5.

[0028] (2) Place the polytetrafluoroethylene film in the pre-polymerization solution of the above step, soak it at room temperature for 60 minutes, take it out and place it between two glass plates, then react it at 70°C for 12 hours, and finally use 150mL volume ratio of 9 :1 mixed solution of methanol and acetic acid eluted to remove trivalent chromium ions load...

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Abstract

Belonging to the technical field of membrane separation, the invention discloses a preparation method and application of a trivalent chromium ion imprinted composite membrane. The ion imprinted composite membrane provided by the invention is economical, practical, and simple in process, and can be used for selective adsorption and separation of trivalent chromium ions in water. The specific methodincludes: taking a commercially available membrane as the support membrane, adopting trivalent chromium ion as the template ion, using 2-vinyl pyridine as the functional monomer, combining ion imprinting technology with membrane separation technology, employing thermal initiation for thermal polymerization of the functional monomer and template ion on the surface of support membrane, and then performing elution to remove the template ion, thus obtaining the trivalent chromium ion imprinted composite membrane. The imprinted composite membrane has imprinted holes matching the shape, size and dimension of trivalent chromium ion on the surface, can specifically identify trivalent chromium ions in the target solution, and can effectively adsorb trivalent chromium ions in the solution.

Description

technical field [0001] The invention relates to a preparation method and application of a trivalent chromium ion imprinted composite membrane, belonging to the technical field of membrane separation. Background technique [0002] In recent years, due to the rapid development of industry, chromium and its compounds are widely used in metallurgy, steel, electroplating and other industrial fields, and a large amount of Cr compounds are discharged into the environment, resulting in the pollution of soil, surface and groundwater. Chromium exists mainly in two valence states of Cr(III) and Cr(VI) in the environment. Cr(III) is an essential micronutrient for metabolism, and a small amount of Cr(III) helps the metabolism of glucose and cholesterol. The toxicity of Cr(VI) is much greater than that of Cr(III), and it is a potential carcinogen, which can cause damage to the skin, respiratory tract, and kidney, and increase the risk of lung cancer. Since Cr(III) is easily converted to ...

Claims

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Application Information

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IPC IPC(8): B01D71/72B01D69/12B01D67/00B01D15/08B01J20/26B01J20/28B01J20/30C08F222/14C08F226/06
CPCB01D71/72B01D69/125B01D67/0006B01J20/268B01J20/28033B01D15/08C08F222/1006C08F222/102
Inventor 成会玲刘迎梅赵莉胡德琼陈树梁字富庭胡显智
Owner KUNMING UNIV OF SCI & TECH
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