Composite semi-permeable membrane containing Cu2-xS for light evaporable water as well as preparation method and application thereof

A composite semi-permeable membrane, cu2-xs technology, applied in semi-permeable membrane separation, general water supply saving, membrane technology and other directions, can solve the problem of high price of precious metal membrane, and achieve the effect of good light-to-heat conversion efficiency

Inactive Publication Date: 2018-06-08
SHANGHAI MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a Cu-containing 2-x The composite semi-permeable membrane of S and its preparation and application. The composite semi-permeable membrane solves the problem of expensive expensive metal membranes used in the prior art, and has the advantages of low cost and good light-to-heat conversion effect.

Method used

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  • Composite semi-permeable membrane containing Cu2-xS for light evaporable water as well as preparation method and application thereof
  • Composite semi-permeable membrane containing Cu2-xS for light evaporable water as well as preparation method and application thereof
  • Composite semi-permeable membrane containing Cu2-xS for light evaporable water as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0055] Preparation of semipermeable membrane precursor solution:

[0056] Slowly add concentrated sulfuric acid to concentrated nitric acid dropwise, the volume ratio of concentrated sulfuric acid to concentrated nitric acid is 2:1, mix well to obtain a mixed acid solution;

[0057] Immerse the absorbent cotton in the mixed acid solution, take it out, rinse it with deionized water, and dry it to obtain cellulose nitrate;

[0058] Take cellulose nitrate, dissolve it in a mixed solution of ethanol and ether with a volume ratio of 1:1, and mix well to obtain a transparent semipermeable membrane precursor solution.

[0059] Preferably, the solvent for preparing the semipermeable membrane precursor solution includes: ether solvent and / or alcohol solvent.

[0060] More preferably, the solvent for preparing the semipermeable membrane precursor solution is a mixture of ethanol and ether at a volume ratio of 1:1.

[0061] A Cu-containing 2-x The purposes of the composite semipermeab...

Embodiment 1

[0063] 1. Preparation of 3D-CuS nanoflowers

[0064] 0.20g CuCl 2 2H 2 O and 0.02g of thiourea were dissolved in a beaker with 10mL of deionized water, and ultrasonicated for 5min to make them evenly dispersed in deionized water. Afterwards, the two solutions were mixed and ultrasonicated for 5 min, so that the two solutions were evenly mixed. Subsequently, the mixed solution was transferred to a polytetrafluoroethylene-lined stainless steel reactor, and the reactor was placed in an oven at 120° C. for 18 h. After taking out the autoclave, it was allowed to cool to room temperature in air. Then, the prepared black suspension was collected, washed 6 times with deionized water and ethanol, respectively, and then the black precipitate was collected by centrifugation. Finally, the collected black precipitate was dried in an oven at 60° C. for 5 h to obtain a black powder of 3D-CuS nanoflowers.

[0065] Such as figure 1 As shown, it is the XRD (X-ray diffraction, X-ray diffra...

Embodiment 2

[0076] 72 mg of CuS powder was added to a beaker containing 1 mL of ethanol solution, and ultrasonicated for 5 min to obtain a uniformly mixed CuS ethanol solution.

[0077] Take out 2mL of the semipermeable membrane precursor solution with a dropper and slowly add it to the CuS ethanol solution above. After the dropwise addition, stir magnetically for 15 minutes to obtain a uniform mixed solution.

[0078] Take out 1.5mL of the mixed solution and add it to the bottom of a 500mL glass beaker with an inner diameter of 74mm, and let it dry naturally in the air to form a film. Then, it was cut into a circular film with a diameter of 34 mm, thus successfully preparing a 3D-CuS nanoflower composite semipermeable membrane with a content of about 8 mg.

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Abstract

The invention discloses a composite semi-permeable membrane containing Cu2-xS for light evaporable water as well as a preparation method and application of the composite semi-permeable membrane. The composite semi-permeable membrane comprises a 3D-CuS nano semiconductor and a semi-permeable membrane precursor. The 3D-CuS nano semiconductor is nano Cu2-xS with a flower-shaped crystal structure, wherein x is more than or equal to 0 and less than or equal to 1; and the semiconductor is obtained by dissolving a divalent copper compound and a sulfur-containing compound in a solvent respectively, mixing the two solutions for reaction at a temperature of 100-125 DEG C to obtain a black precipitate, and carrying out drying. The content of 3D-CuS accounts for 5-80% of the total composite semi-permeable membrane. The semi-permeable membrane precursor comprises any one or more of cellulose nitrate, polyvinylidene fluoride and polyamide. The composite semi-permeable membrane provided by the invention has more advantages than simply using Cu2-xS in the application of light evaporable water, wherein the semi-permeable membrane is used as a supporting material to ensure that the photothermal conversion material Cu2-xS can float on the water surface, and a local high temperature is generated at an interface between water and air under the radiation of sunlight, so that the water is evaporatedand the purpose of desalinating seawater is achieved.

Description

technical field [0001] The invention relates to a composite semipermeable membrane, in particular to a Cu-containing 2-x Composite semipermeable membrane of S and its preparation and use. Background technique [0002] In today's society, the shortage of fresh water resources, environmental pollution, and energy depletion have gradually become three major problems restricting the sustainable development of the world. Among them, water resources are the source of life, and the shortage of fresh water resources is a major problem that human beings must solve at present. Although two-thirds of the earth's surface is covered by water, seawater accounts for 97.5% of the world's total water resources, while freshwater only accounts for 2.5%. However, the fresh water resources that humans can really use are only a part of rivers, lakes and groundwater resources on land, and this part of water resources only accounts for about 0.00768% of global water resources, which is extremely l...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/02B01D67/00C02F1/44C02F103/08
CPCB01D67/00B01D69/12B01D71/02C02F1/447C02F2103/08Y02A20/131
Inventor 陶富军张玉良曹胜佳尹宽王斌斌李丽
Owner SHANGHAI MARITIME UNIVERSITY
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