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Efficient, antifouling carboxylated graphene oxide nanofiltration membrane, preparation method and application thereof

A carboxylation and graphene technology is applied in the field of nanofiltration membranes to achieve the effects of increasing water flux, increasing the ability to treat organic wastewater, and improving filtration speed

Active Publication Date: 2021-09-24
成都石大力盾科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still two major challenges in the treatment of organic wastewater by graphene oxide nanofiltration membranes under the condition of external pressure, namely: high water treatment efficiency and long-term stability

Method used

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  • Efficient, antifouling carboxylated graphene oxide nanofiltration membrane, preparation method and application thereof
  • Efficient, antifouling carboxylated graphene oxide nanofiltration membrane, preparation method and application thereof
  • Efficient, antifouling carboxylated graphene oxide nanofiltration membrane, preparation method and application thereof

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Experimental program
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Effect test

Embodiment

[0052] A highly efficient and antifouling carboxylated graphene oxide nanofiltration membrane

[0053] The production method is as follows:

[0054] S1: Take graphene oxide with a single layer size ≤ 15 μm and prepare a 2.5 mg / mL graphene oxide dispersion with pure water;

[0055] S2: Take 30ml of graphene oxide dispersion in a beaker, add 5ml of HBr, stir vigorously at 1000 rpm, and react for 12 hours;

[0056] S3: After the reaction in step S2, add 1.5 g of oxalic acid to the reaction system and continue stirring for 4 hours to obtain the reaction product;

[0057] S4: Centrifugal dispersion and purification of the reaction product, the specific operation is:

[0058] S41 centrifuge the reaction product obtained in step S3 at a speed of 10,000 rpm, take the precipitate, and wash the precipitate with pure water;

[0059] S42 Centrifuge the precipitate washed in step S41 at a speed of 10,000 rpm, take the precipitate, and wash the precipitate with pure water;

[0060] S43:...

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Abstract

The embodiment of the present application provides a method for preparing a high-efficiency, antifouling carboxylated graphene oxide nanofiltration membrane, comprising the following steps: S1: configuring graphene oxide into a graphene oxide dispersion with pure water; S2: adding graphene oxide to graphene oxide Add HBr to the dispersion, stir and react for 10-15 hours; S3: After the reaction in step S2, add oxalic acid to the reaction system and continue stirring for 2-6 hours to obtain the reaction product; S4: Centrifuge the reaction product obtained in step S3, Obtain carboxylated graphene oxide; S5: configure the carboxylated graphene oxide obtained in step S4 into a carboxylated graphene oxide dispersion, and suction-filter the carboxylated graphene dispersion on a polyvinylidene fluoride support membrane to obtain carboxyl Graphene oxide nanofiltration membrane. The method for preparing the carboxylated graphene oxide nanofiltration membrane provided by the present invention is simple, easy to operate, does not add many chemical reagents, is more environmentally friendly, saves costs, and has strong organic wastewater treatment capacity and anti-fouling capacity.

Description

technical field [0001] The present application relates to the technical field of nanofiltration membranes, in particular, to a high-efficiency, antifouling carboxylated graphene oxide nanofiltration membrane, a preparation method and its application. Background technique [0002] Among water treatment separation membranes, nanofiltration membrane is an emerging membrane technology, its separation efficiency is higher than that of ultrafiltration membrane, and it can effectively intercept small organic molecules and multivalent salts. The purified water can meet most purposes, such as: food, Medical, scientific research, pharmaceutical, etc. In addition, under the premise that the filtration effect is close to that of reverse osmosis technology, the required external pressure is much smaller than that of reverse osmosis membrane technology. attention of most researchers. [0003] In the practical application of nanofiltration membranes, traditional polymer nanofiltration me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/10B01D71/02C02F1/44
CPCB01D67/0079B01D69/10B01D71/021C02F1/44
Inventor 何毅余昊李虹杰周良范毅马静钟菲殷祥英王宇琪
Owner 成都石大力盾科技有限公司
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