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Modified graphene membrane for separation of monovalent and multivalent metal ions and preparation method thereof

A technology of polyvalent metal ions and graphene membranes, applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of inability to prepare two-dimensional nanosheets, unfavorable ion and molecular precise separation, and mass transfer resistance Low-level problems, achieve good separation stability and repeatability, avoid thermal fluctuations and wrinkles, and avoid high-temperature conditions

Active Publication Date: 2020-06-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, thermal reduction will destroy the structure of graphene oxide nanosheets, forming a large number of defects and holes, which is not conducive to the precise separation of ions and molecules.
The chemical reduction under high-temperature hydrothermal conditions will cause the undulation and wrinkling of the sheet, resulting in the unevenness of the constructed nanostructure and affecting the uniformity of the height of the two-dimensional nanochannel.
None of these methods can produce two-dimensional nanosheets suitable for the separation of monovalent / multivalent metal ions
[0008] None of the above methods can achieve efficient and accurate separation of monovalent and multivalent metal ions.
At present, how to achieve this goal and construct nanomembrane pores or nanochannels with uniform size, low mass transfer resistance and good separation precision are still a big challenge.

Method used

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  • Modified graphene membrane for separation of monovalent and multivalent metal ions and preparation method thereof
  • Modified graphene membrane for separation of monovalent and multivalent metal ions and preparation method thereof
  • Modified graphene membrane for separation of monovalent and multivalent metal ions and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0053] In this embodiment, the preparation methods of the slightly reduced graphene oxide sheet and the modified graphene film are as follows:

[0054] (1) Using improved Hummer method to prepare graphene oxide

[0055] ①Add 3g of scaly graphite graphite, 12mL of concentrated sulfuric acid, 2.5g of potassium persulfate, and 2.5g of phosphorus pentoxide into a single-necked flask, react at 80°C for 4.5h under stirring, cool the resulting reaction solution to room temperature, and add 500mL Stir overnight with deionized water, then filter, rinse the filter cake with 1500 mL of deionized water, and let it dry for 24 hours at room temperature to remove the water in the filter cake, which completes the pretreatment of graphite;

[0056] ②Add 120mL of concentrated sulfuric acid at a temperature of 0℃ into the conical flask, then add the graphite pretreated in step ①, and then add 15g potassium permanganate, control the potassium permanganate addition speed as slow as possible to make the c...

Embodiment 2

[0070] In this embodiment, the preparation method of the modified graphene oxide film is basically the same as the operation of embodiment 1, except that the reaction time at room temperature in step (2) is 24 hours. The carbon-oxygen ratio of the 24-hour modified graphene oxide film prepared in this embodiment is 1.206-1.285, and the average wet effective interlayer spacing is 0.7736 nm.

Embodiment 3

[0072] In this embodiment, the preparation method of the modified graphene oxide film is basically the same as the operation of embodiment 1, except that the reaction time of the normal temperature table in step (2) is 48 hours. The carbon to oxygen ratio of the 48-hour modified graphene oxide film prepared in this embodiment is 1.346-1.403, and the average wet effective interlayer spacing is 0.7340 nm.

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Abstract

The invention discloses a modified graphene film applied to monovalent and polyvalent metal ion separation. The film is prepared from a material of slight-reduction graphene oxide with a mass ratio of carbon to oxygen as 1.2 to 1.4, and a two-dimensional nano mass transfer channel formed by a slight-reduction graphene oxide sheet layer in the film can let monovalent metal ions to pass through and intercept polyvalent metal ions. The preparation method of the modified graphene film comprises the following technological steps: evenly dispersing slight-reduction graphene oxide into water to form a slight-reduction graphene oxide film casting solution, filtering the film casting solution by a base material film to form a wet-state modified graphene film on the base material film, drying the wet-stage modified graphene film and the base material film together under normal temperature and peeling from the base material film after being dried to obtain the modified graphene film.

Description

Technical field [0001] The invention belongs to the field of graphene oxide membranes, and particularly relates to a modified graphene membrane for separating monovalent and multivalent metal ions and a preparation method thereof. Background technique [0002] The separation of monovalent / multivalent metal ions is widely used in the fields of resources, environment, agriculture, life and health. Monovalent metal ions such as potassium, sodium, and lithium ions are all ions that have positive significance for human production and life. Potassium ions are the main metal ions in the intracellular fluids of humans and animals, which directly affect the health of humans and animals; potassium ions are also one of the three major nutrients for plant growth, and the use of potassium fertilizer can promote the maturity of crops. Sodium ions are the main metal ions in the extracellular fluids of humans and animals. Adults need to consume about 10 grams of salt a day to supplement the sod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/02B01D67/00C02F1/44C02F101/20
CPCB01D67/0039B01D69/02B01D71/024B01D2325/02B01D2325/30C02F1/44C02F2101/20
Inventor 奚月恒刘壮褚良银汪伟谢锐巨晓洁
Owner SICHUAN UNIV
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