Crystallizing method for unsaturated salt solution on basis of carbon-based material

A carbon-based material and salt solution technology, which is applied in the field of unsaturated salt solution crystallization and can solve problems such as inability to precipitate crystals.

Inactive Publication Date: 2019-03-19
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that salt solutions with a concentration far below the saturation concentration cannot precipitate crystals under normal temperature and pressure conditions, and provide a method for crystallization of unsaturated salt solutions based on carbon-based materials

Method used

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  • Crystallizing method for unsaturated salt solution on basis of carbon-based material
  • Crystallizing method for unsaturated salt solution on basis of carbon-based material
  • Crystallizing method for unsaturated salt solution on basis of carbon-based material

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Graphene oxide membranes with filter membrane supports and partially reduced graphene oxide membranes were prepared by suction filtration.

[0037] Take 1mL graphene oxide aqueous solution with a concentration of 5mg / mL, dilute it to 10mL with deionized water, carry out filter membrane suction filtration, and then put it in an oven to dry at 70°C for 8 hours to obtain a graphene oxide membrane supported by a filter membrane. 25 microns thick;

[0038] Preparation of partially reduced graphene oxide: Put the above obtained graphene oxide membrane with filter membrane support into a reaction kettle containing 30mL deionized water for hydrothermal reaction at 180°C to obtain a partially reduced graphene oxide membrane, which The thickness is 25 microns.

[0039]The graphene oxide membrane with filter membrane support was soaked in the molar concentration of 0.25mol / L, 0.5mol / L, 1.0mol / L, 1.5mol / L, 2.0mol / L, 2.5mol / L, 3.0mol / L L, 4.0mol / L and 5.0mol / L NaCl aqueous solutio...

Embodiment 2

[0042] Freestanding graphene oxide membranes prepared by drop-coating method.

[0043] Take 1 mL of graphene oxide aqueous solution with a concentration of 5 mg / mL and drop-coat it on the surface of smooth hydrophobic paper, and dry it in an oven at 70°C for 8 hours to obtain an independently supported graphene oxide film with a thickness of 100 microns.

[0044] Soak the independently supported graphene oxide membranes in molar concentrations of 0.1mol / L, 0.25mol / L, 0.5mol / L, 1.0mol / L, 2.0mol / L, 2.5mol / L, 4.0mol / L, 4.5 mol / L and 5.0mol / L NaCl aqueous solution for 0.5 hours, then remove the soaking solution and centrifuge to separate the adsorbed water from the surface of the membrane, take out the wet film and weigh it, then put it in an oven for 6 hours to dry at 60°C, take out the dry film and weigh it.

[0045] Calculate the salt solution, the adsorption amount of salt in the membrane and the salt concentration in the membrane after the independently supported graphene oxi...

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Abstract

The invention discloses a crystallizing method for an unsaturated salt solution on the basis of a carbon-based material. The method comprises the following step: soaking the carbon-based material in the salt solution for 10-120 min until crystals are separated out. The salt solution is an unsaturated solution, and the molar concentration of the salt solution is greater than 1 mol / L. The preparation process of the method is simple, and is easy to operate, the crystals are prepared in a normal-temperature and normal-pressure unsaturated solution, a method for preparing crystals under the condition that the concentration is far lower than saturation concentration is opened up, and the application prospect is good.

Description

technical field [0001] The present invention relates to a method for crystallization of an unsaturated salt solution based on carbon-based materials. Background technique [0002] With the rapid growth of global population and industrialization, fresh water resources are increasingly scarce, and this urgent situation is expected to be effectively resolved by water desalination and purification (Nature 452, 2008, 301-310). [0003] Carbon-based materials such as graphene oxide membranes have gradually shown the potential of a new generation of filter membranes due to their fast and precise desalination characteristics (Science 343, 2014, 752-754; Science 333, 2011, 712-717; Science 332, 2011, 674-676; Adv. Funct. Mater. 23, 2013, 3693-3700; Chem. Soc. Rev. 44, 2015, 5016-5030). The crucial factors for carbon-based materials as filter membranes are the formation of water channels and the rapid permeation of water and retention of salt ions in the channels. When water molecul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/00B01D71/02B01D67/00
CPCB01D9/00B01D67/0039B01D71/021B01D2009/0086
Inventor 方海平吴明红石国升陈亮梁珊珊杨一舟
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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