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Magnetic polybenzimidazole molecular imprinted adsorbing agent, preparation and use thereof

A technology of polybenzimidazole and molecular imprinting, applied in the direction of adsorption of water/sewage treatment, other chemical processes, chemical instruments and methods, etc., can solve the problems of molecular imprinted adsorbents not having magnetism, high reaction requirements, low reaction requirements, etc. , to achieve the effect of sustainable development, simple operation process and good reference value

Inactive Publication Date: 2014-10-01
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) These methods have disadvantages such as expensive, high reaction requirements or difficult regeneration
[0009] (2) Does not have the ability to selectively remove PFOS
The actual sewage contains a large number of interfering ions, which will greatly reduce the selection effect of traditional technologies for PFOS, so their selectivity plays a vital role in the removal of PFOS in complex water bodies
[0010] (3) Molecularly imprinted adsorbents are not magnetic, making separation difficult
[0011] The above defects have caused so far that it is difficult to obtain adsorbents that are cheap, low in reaction requirements, easy to separate, good in regeneration, and selectively adsorb PFOS by using existing processes.

Method used

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  • Magnetic polybenzimidazole molecular imprinted adsorbing agent, preparation and use thereof
  • Magnetic polybenzimidazole molecular imprinted adsorbing agent, preparation and use thereof
  • Magnetic polybenzimidazole molecular imprinted adsorbing agent, preparation and use thereof

Examples

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preparation example Construction

[0042] Preparation of magnetic PBI molecular imprinting adsorbent:

[0043] In this embodiment, the adsorption amount refers to the mass (mg / g) of PFOS adsorbed per gram of adsorbent.

Embodiment 1

[0047] Dissolve 0.03g of PBI in 2mL of DMAc, add 0.2mL of PFOS solution after it is completely dissolved, carry out stirring at 25°C for 6h, add 0.3g of Fe 3 o 4 Grind, dry in a vacuum oven at 80°C, take it out and grind it into powder. Then put it in a solution of 0.5M NaOH / methanol (V / V=1 / 1) for elution for 6 hours to remove template molecules, then rinse repeatedly with ultrapure water, and finally put it in an oven and dry it to constant weight to obtain a magnetic Molecularly imprinted adsorbent (MMIP). Put 15mg of MMIP adsorbent into a 250mL Erlenmeyer flask, then add 15mL of PFOS solution (pH=4) with a concentration of 200mg / L, and carry out adsorption in a constant temperature shaking box at 25°C for 180min at a speed of 180r / min (up to balance), such as Figure 4 As shown, the equilibrium adsorption capacity of MMIP is 117.65 mg / g, which is higher than that of MNIP.

Embodiment 2

[0049] In Example 1, other conditions remain unchanged, when the addition amount of template molecule PBI is 0.01g, the equilibrium adsorption amount of MMIP is 92.71mg / g; When the addition amount of template molecule PBI is 0.02g, the equilibrium adsorption amount of MMIP The amount is 115.18mg / g; when the addition amount of the template molecule PBI is 0.04g, the equilibrium adsorption amount of MMIP is 122.17mg / g. The equilibrium adsorption capacity of MNIP remained unchanged at 74.63mg / g.

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Abstract

The invention discloses a magnetic polybenzimidazole (PBI) molecular imprinted adsorbing agent, preparation and use of the magnetic polybenzimidazole (PBI) molecular imprinted adsorbing agent. The preparation method comprises the step: with PFOS (perfluorooctane sulfonates) as a template molecule and soluble PBI as a functional monomer, preparing a magnetic molecular imprinted polymer (MMIP) with a function of specifically identifying PFOS by using Fe3O4 magnetic nanometer particles. The saturation magnetization of the prepared magnetic PBI molecular imprinted polymer is 75.998 emu / g. The MMIP is used for removing the PFOS in a water body, has a good selective removing effect, and is capable of rapidly achieving adsorption equilibrium. Meanwhile, the magnetic PBI molecular imprinted polymer can be recovered through an applied magnetic field, thereby facilitating recycling. The magnetic polybenzimidazole molecular imprinted adsorbing agent has great importance in adsorption removal of the PFOS in water, and has a good application prospect in wastewater treatment.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a magnetic polybenzimidazole molecularly imprinted adsorbent, its preparation and application. The adsorbent prepared by the method can selectively adsorb perfluorooctane sulfonic acid (PFOS) in complex water bodies. ), the saturated adsorbent is separated by an external magnetic field for recycling. Background technique [0002] PFOS is an eight-carbon perfluoroalkane with a terminal sulfonate group (CF 3 (CF 2 ) 7 SO 3 H), its derivatives can be expressed as: C 8 f 17 SO 2 X, where X can be a halide, a metal salt, a polymer, an amino compound, or the like. PFOS is refractory, bioaccumulative, developmental toxicity, and endocrine toxicity in the environment. In 2009, PFOS was included in the latest list of persistent organic pollutants (POPs). At present, there are traces of PFOS pollution in the investigated water bodies, sediments and organisms all ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/36
Inventor 王正萍郭盼盼周艳孙悦欣
Owner NANJING UNIV OF SCI & TECH
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