Modified graphene oxide film based on anion and cation regulation, and preparation method and application thereof

A graphene membrane, anion and cation technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficult to prepare separation membranes, achieve high water permeation selectivity and permeation flux, and economical The effect of technical means and environmental protection technical means

Active Publication Date: 2021-06-15
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of modified graphene oxide membrane, preparation method and application based on anion and cation regulation, It is used to solve the problems in the prior art that it is difficult to prepare effective separation membranes based on membrane separation technology, especially separation membranes for seawater desalination

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  • Modified graphene oxide film based on anion and cation regulation, and preparation method and application thereof
  • Modified graphene oxide film based on anion and cation regulation, and preparation method and application thereof
  • Modified graphene oxide film based on anion and cation regulation, and preparation method and application thereof

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preparation example Construction

[0044] like figure 1 As shown, the present invention provides a kind of preparation method based on the modified graphene oxide membrane of anion and cation regulation, and described preparation method comprises the steps:

[0045] S1, providing graphene oxide, and dissolving the graphene oxide in water to obtain a graphene oxide sol;

[0046] S2, providing a porous carrier, forming a graphene oxide film on the surface of the porous carrier based on the graphene oxide sol;

[0047] S3, providing anion / cation solution;

[0048] S4, immersing the graphene oxide film in the anion / cation solution for modification treatment to obtain a modified graphene oxide film.

[0049] The preparation method of the modified graphene oxide membrane based on anion and cation regulation of the present invention will be described in detail below in conjunction with the accompanying drawings. The preparation sequence of the preparation method of the graphene oxide film can be changed by those skil...

Embodiment 1

[0081] Example 1 Preparation of Graphene Oxide Membrane on a Tubular Ceramic Carrier for Separation of a Mixture of Water and Sodium Chloride

[0082] Step 1: Dissolve 10 mg of graphene oxide in 100 mL of deionized water, and sonicate for 30 minutes to form a 0.1 mg / mL graphene oxide hydrosol.

[0083] Step 2: Select a porous alumina ceramic tube as the carrier. The inner and outer diameters of the porous ceramic tube are 7mm and 10mm respectively, the average pore diameter of the inner surface is 100nm, the two ends of the carrier are glazed, and the effective membrane length is 20mm. Wash and dry for later use.

[0084] Step 3: Take 5mL of the above-mentioned graphene oxide hydrosol, dilute it to 200mL, and deposit it on the inner surface of the carrier by pressure-assisted deposition at a pressure of 2-10bar.

[0085] Step 4: Place the graphene oxide membrane supported by the porous alumina tube in an anion and cation solution of corresponding concentration, soak for 1 hou...

Embodiment 2

[0095] Example 2 Preparation of Graphene Oxide Membrane on a Tubular Ceramic Carrier for Separating Water and a Mixture of Inorganic Salts in Different Ionic Valence States

[0096] The difference from Example 1 is: step 5, the mixture of pure water and sodium chloride, sodium sulfate, magnesium chloride, and magnesium sulfate is separated by pervaporation separation process, the operating temperature is 70°C, the system pressure is 0.1MPa, and the feed The molar concentration is 0.1M. All the other steps are the same as in Example 1.

[0097] The pervaporation test results are shown in Table 2:

[0098] The seawater desalination pervaporation test result of table 2 embodiment 2

[0099]

[0100]

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Abstract

The invention provides a modified graphene oxide film based on anion and cation regulation, and a preparation method and application thereof. The preparation method comprises the following steps: preparing graphene oxide sol; preparing a graphene oxide film on the surface of a porous carrier; preparing an anion / cation solution; and dipping the graphene oxide film in the anion / cation solution for modification treatment to obtain the modified graphene oxide film. According to the invention, the graphene oxide film is obtained, and a membrane material with the graphene oxide film as a selective layer is prepared in a simple and convenient manner by regulating and controlling the interlayer spacing of graphene oxide based on anions and cations and is applied to a pervaporation desalination technology. The interlayer spacing of the graphene oxide is regulated and controlled by utilizing a simple method, and the prepared graphene oxide film has relatively high water permeation selectivity and permeation flux, and can effectively desalinate seawater, so an efficient, environment-friendly and economic technical means is provided for seawater desalination, and the method has important practical significance.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to a modified graphene oxide membrane based on anion and cation regulation, a preparation method and an application. Background technique [0002] Water is one of the basic necessities of life on earth, but with the increase of world population and climate change, the shortage of fresh water resources has become a serious problem, and desalination of seawater has become an important method to increase the supply of fresh water. Currently, many purification technologies have been applied to water desalination, including distillation, ion exchange, and membrane separation. [0003] Traditional water purification methods such as distillation are effective means for removing bacteria, minerals, water hardening substances such as calcium, magnesium and harmful metals. However, distillation can remove drinking water contaminants, but not chlorine and some VOC comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00B01D61/36C02F1/44C02F103/08
CPCB01D71/021B01D67/0039B01D61/362C02F1/448C02F2103/08Y02A20/131
Inventor 曾高峰王玥吴平孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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