Supramolecular block thin film as well as preparation method and application thereof

A supramolecular and thin-film technology, applied in separation methods, chemical instruments and methods, filtration separation, etc., can solve the problems of harsh preparation conditions, high actual cost, obstacles to large-scale production and practical application, etc., and achieve good mechanical properties and reduce Sewage treatment cost, easy to achieve effect

Pending Publication Date: 2022-06-21
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, their high actual cost and harsh preparation conditions hinder their large-scale production and practical application

Method used

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  • Supramolecular block thin film as well as preparation method and application thereof
  • Supramolecular block thin film as well as preparation method and application thereof
  • Supramolecular block thin film as well as preparation method and application thereof

Examples

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preparation example Construction

[0053] The object of the second aspect of the present invention is to provide a method for preparing the supramolecular bulk thin film, which is prepared by using an ionic surfactant and a polyelectrolyte as raw materials. Specifically include the following steps:

[0054] Step 1. The ionic surfactant is added to the polyelectrolyte aqueous solution, and the reaction is stirred to obtain a suspension containing electrostatic assemblies.

[0055] The selection range of the ionic surfactant and the polyelectrolyte is the same as the selection range of the ionic surfactant and the polyelectrolyte in the first aspect of the present invention.

[0056] The molar concentration of the polyelectrolyte solution is not greater than the molar concentration of the charged polyelectrolyte in the saturated solution of the polyelectrolyte, preferably 0.001 mM-80 mM, more preferably 1-50 mM. The polyelectrolyte solution molarity is measured by the molarity of the charged polyelectrolyte in i...

Embodiment 1

[0090] Dissolve polystyrene sodium sulfonate (PSS) solid in water to obtain a PSS aqueous solution with a negative charge concentration of 20 mM, then add ditetradecyldimethylammonium bromide (DTTAB) solid powder into the above solution, control The amount added was such that the DTTAB cation concentration in the solution was also 20 mM.

[0091] The two components were fully mixed by stirring and shaking, and a large number of white flocculent precipitates appeared in the solution. The suspension was centrifuged at 5000rpm to obtain white precipitates of PSS / DTTAB electrostatic assemblies stacked together. The specific process is as follows: figure 1 shown.

Embodiment 2

[0093] The PSS / DTTAB electrostatic assembly obtained in Example 1 was placed on a glass substrate, covered with another piece of glass, and pressed with fingers for 10 seconds, then the pressure was stopped.

[0094] When the upper glass is removed, it can be found that the original loose white PSS / DTTAB electrostatic assembly has been transformed into a transparent film, and the film is peeled off from the glass substrate to obtain a PSS / DTTAB supramolecular block film with complete morphology, PSS / DTTAB supramolecular block Macrophotographs of bulk films such as figure 1 shown.

[0095] The PSS / CTAB supramolecular bulk film was easily peeled off from the glass substrate, indicating that the film has good self-supporting properties. The two ends of the PSS / CTAB film are aligned and bent with tweezers, and the film can be quickly restored to its original shape after the tweezers are released, indicating that the film has good bendability and recovery.

[0096] The PSS / DTTAB ...

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Abstract

The invention provides a supramolecular block thin film. The thin film is prepared by taking an ionic surfactant and polyelectrolyte as raw materials. The raw materials are various, the ionic surfactant and various polyelectrolytes can be selectively combined for preparation according to the characteristics of the sewage, and the applicability is high. The preparation of the film is carried out in a room temperature environment, the whole process is completed in water, no organic solvent needs to be added, high temperature and high pressure do not need to be applied, the preparation method is a completely green chemical process, preparation equipment is simple, and the preparation method is easy to implement in industry. The obtained supramolecular block thin film has self-supporting property and bendability, is good in mechanical property, easy to repair and regenerate, and can be recycled, and the sewage treatment cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of organic pollutant adsorption materials, and in particular relates to a supramolecular block film for adsorbing organic pollutants. Background technique [0002] At present, due to the rapid development of science and technology industry, water resources are seriously polluted and water resources are gradually depleted. As a global problem, water shortage has seriously affected the sustainable economic development and ecological security of all countries in the world. Among them, the leakage of organic chemicals such as petroleum and the discharge of wastewater are the main causes of water pollution. To remove these organic contaminants from water, efficient but economical absorbent materials are required. [0003] Traditional adsorption materials, such as activated carbon, natural fibers, and zeolites, suffer from low absorption capacity, non-recyclability, or high energy consumption during regeneration...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/34B01J20/30C02F1/28C02F1/40C02F101/30
CPCB01J20/06B01J20/22B01J20/265B01J20/28033B01J20/3491C02F1/288C02F1/40C02F2101/30
Inventor 阎云王文恺黄建滨
Owner PEKING UNIV
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