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Devices and methods for water-filtration membranes

A horizontal and compositional technology, applied in the field of graphene oxide water filtration membrane, can solve problems such as uneven distribution of pore size and porosity, limitation of membrane hydrophilicity, uneven dispersion, etc., to improve hydrophilicity and water flux , Improve the effect of anti-fouling and anti-biofouling properties

Active Publication Date: 2021-04-09
上海特瑞思材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphene oxide obtained by conventional methods is usually oversized or unevenly dispersed, resulting in uneven pore size and / or porosity distribution of the membrane
In addition, insufficient hydrophilic functional groups are included in graphene oxide prepared by conventional processes, which limits the hydrophilicity of membranes.

Method used

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  • Devices and methods for water-filtration membranes
  • Devices and methods for water-filtration membranes
  • Devices and methods for water-filtration membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Example 1 - Synthesis of Graphene Oxide Using Graphite Powder

[0113] In this embodiment, the graphite powder is mechanically pulverized and / or ground to obtain an ultra-fine graphite powder with an average particle size not exceeding 2 microns. Add 1 kg of ultra-fine graphite powder and 5-10 kg of potassium permanganate powder into the reactor, whose lining is coated with polytetrafluoroethylene or glass, and stir continuously with a stirrer, cool and keep at a low temperature at a constant temperature of 10°C. Concentrated sulfuric acid (eg, concentration greater than 94%) is slowly added in a total volume of 40-100 liters, and the mixture is stirred well for 15 minutes to 1 hour.

[0114] The reactor is heated to 40-50°C and kept at this temperature for 2-24 hours, then the reactor is cooled and kept at a constant temperature below 10°C, and 40-200 kg is made of deionized water Add ice cubes to the reactor and continue stirring until all ice cubes have melted and ...

Embodiment 2

[0119] Example 2 - Synthesis of Graphene Oxide Using Sugars

[0120] Add 1-5 kg ​​of solid powder of monosaccharides, disaccharides and / or polysaccharides, eg, glucose, fructose or sucrose, to 1 liter of deionized (DI) water, heat (to 50-80° C.), and stir to dissolve. The obtained warm solution was placed in a steel container. The steel container is sealed, and the steel container is heated in a reaction furnace. When the steel container is heated to 160-220°C, the pressure in the steel container can reach 12-20 atm. After reacting for 2-5 hours, cool the steel container to room temperature, and vent the gas in the steel container to release the pressure. The reaction product in the steel container was taken out and subjected to drying treatment to obtain a solid reaction product powder.

[0121] 30-60 liters of concentrated sulfuric acid with a concentration greater than 94% is added to the reactor, which is lined with polytetrafluoroethylene or glass coating. Cool the re...

Embodiment 3

[0125] Example 3 - Synthesis of Graphene Oxide Using Sugars and Acids

[0126]Carboxylic acid, oxalic acid, citric acid, phosphoric acid, benzoic acid, dihydroxybenzene and dopamine are added to deionized water together with a certain amount of monosaccharide, disaccharide or polysaccharide (such as glucose, fructose or sucrose) solid powder, and heated (50-80°C) stirring to dissolve. The obtained warm solution was placed in a steel vessel, which was sealed and then heated in a reaction furnace. When the steel container is heated to 160-220°C, the pressure in the steel container can reach 12-20atm. After reacting for 2-5 hours, the steel container was cooled to room temperature, and the gas in the steel container was vented to release the air pressure. Take out the reaction product in the steel container, add it to ethanol or methanol solution, perform repeated washing and repeated filtration to remove impurities, and then perform drying treatment to finally obtain a diamete...

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Abstract

Water- filtration compositions, membranes, devices, and manufacturing processes including graphene oxide with hydrophilic functional groups. Disclosed are a composition comprising graphene oxide with an average particle diameter of no more than about 1 um and has an oxygen atomic percentage of at least about 30%, a membrane comprising the composition, a water-permeable device comprising the membrane, a method of making the membrane using the composition, and several methods of generating the composition.

Description

technical field [0001] The present disclosure generally relates to devices and methods for water treatment, and more particularly, to water filtration membranes, devices, and methods of manufacture including graphene oxide having hydrophilic functional groups. Background technique [0002] Membrane technology is favored over other technologies in water treatment applications such as disinfection, distillation, or media filtration because it typically does not require chemical additives, heat input, or regeneration of spent media. However, the operating cost of membrane technology is relatively high due to the short lifespan of the membrane and the rapid performance degradation caused by membrane fouling. When the pores in the membrane become blocked or clogged, or when a layer of polarized concentration or filter cake forms on the membrane surface, the water flux through the membrane will be significantly reduced. [0003] The antifouling properties of conventional water fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198C01B32/23C01B32/192
CPCC01B32/198B01D67/0079B01D69/02B01D69/08B01D69/10B01D69/12B01D69/148B01D71/024B01D71/34B01D71/68B01D2323/08B01D2323/12B01D2325/02B01D2325/20B01D2325/34B01D2325/36C02F1/44C02F2303/20
Inventor 李昆洲聂子淞
Owner 上海特瑞思材料科技有限公司