Superhydrophilic and underwater superoleophobic calcium carbonate hybrid membrane, preparation method and application

An underwater super-oleophobic and calcium carbonate technology, applied in chemical instruments and methods, separation methods, membranes, etc., can solve the problems of unsuccessful preparation of calcium carbonate membranes, poor stability, poor controllability, time-consuming and labor-intensive preparation, etc., to achieve Good separation effect, low adhesion, time-saving and labor-saving operation

Active Publication Date: 2017-04-05
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Adv.Mater.2011, 23, 2009–2014; JCRYST GROWTH2012.01.037; Langmuir2015, 31, 2014–2018 and other documents successively explored the preparation of independent calcium carbonate membranes, but none of them successfully prepared a complete independent calcium carbonate film with excellent mechanical properties. Calcium carbonate film; and the preparation method is mostly CO 2 Gas diffusion mineralization method or layer-by-layer self-assembly method is time-consuming and labor-intensive to prepare, with poor stability and controllability
It can be seen that the preparation of calcium carbonate membrane is still in the exploratory stage.
[0004] In addition, in the field of oil-water separation, the preparation process of existing separation membranes (such as fluorosilane grafted ceramic membranes, nano-carbon dioxide coated ceramic membranes and calcium carbonate-based PAA grafted polypropylene microporous membranes, etc.) is complicated and the cost is too high , which limits its application in the field

Method used

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  • Superhydrophilic and underwater superoleophobic calcium carbonate hybrid membrane, preparation method and application
  • Superhydrophilic and underwater superoleophobic calcium carbonate hybrid membrane, preparation method and application
  • Superhydrophilic and underwater superoleophobic calcium carbonate hybrid membrane, preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 50 g of 0.1 M CaCl 2 solution, adding 50g concentration of 0.05wt% sodium alginate solution to form calcium alginate gel; form flocculent precipitate at 1000rpm stirring speed; add 50g concentration of 0.05M Na at 1000rpm stirring speed 2 CO 3 Solution, react to obtain calcium carbonate-calcium alginate hybrid particles; vacuum filter the precipitate, and dry it at 30°C to obtain an independent calcium carbonate-calcium alginate gel hybrid film.

[0039] Calcite is the main crystal form of calcium carbonate in the film prepared under this condition. The particle size of calcium carbonate is 10-50 μm, and the pore size is 5-30 μm. The water flux is 20000±26L m -2 h -1 . The separation efficiency of oil-water emulsion is 90.00±0.09%. The tensile modulus of the film is 1.00±0.08 GPa; the flexural modulus is 1.1±0.1 GPa.

Embodiment 2

[0041] 50 g of 0.1 M CaCl 2 solution, adding 50g concentration of 0.05wt% sodium alginate solution to form calcium alginate gel; form flocculent precipitate at 10000rpm stirring speed; add 50g concentration of 0.05M Na at 15000rpm stirring speed 2 CO 3 Solution, react to obtain calcium carbonate-calcium alginate hybrid particles; vacuum filter the precipitate, and dry it at 30°C to obtain an independent calcium carbonate-calcium alginate gel hybrid film.

[0042] Calcite is the main crystal form of calcium carbonate in the film prepared under this condition. The particle size of calcium carbonate is 1-5 μm, and the pore size is 1-3 μm. The water flux is 10000±20L m -2 h -1 . The separation efficiency of oil-water emulsion is 99.00±0.05%. The tensile modulus of the film is 1.15±0.11 GPa; the flexural modulus is 1.2±0.12 GPa.

Embodiment 3

[0044] 50 g of 0.1 M CaCl 2 solution, adding 50g concentration of 0.05wt% sodium alginate solution to form calcium alginate gel; form flocculent precipitate at 15000rpm stirring speed; add 50g concentration of 0.05M Na at 30000rpm stirring speed 2 CO 3 Solution, react to obtain calcium carbonate-calcium alginate hybrid particles; vacuum filter the precipitate, and dry it at 30°C to obtain an independent calcium carbonate-calcium alginate gel hybrid film.

[0045] Calcite is the main crystal form of calcium carbonate in the film prepared under this condition. The particle size of calcium carbonate is 500nm-3μm, and the pore size is 500nm-2μm. The water flux is 7000±17L m -2 h -1 . The separation efficiency of oil-water emulsion remains above 99.99%. The tensile modulus of the film is 1.23±0.09GPa; the flexural modulus is 1.4±0.15GPa.

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Abstract

The invention provides a preparation method of a superhydrophilic and underwater superoleophobic calcium carbonate hybrid membrane. The method includes the steps of: (1) adding a calcium ion solution into an alginate solution to prepare calcium alginate gel, and performing stirring treatment on the gel to form flocculent precipitate; (2) under stirring, adding a carbonate solution into the material obtained by step (1) to obtain calcium carbonate-calcium alginate hybrid particles; and (3) conducting pumping filtration and drying on the material obtained by step (2), thus obtaining the superhydrophilic and underwater superoleophobic calcium carbonate hybrid membrane. The invention also provides the hybrid membrane prepared by the method and application thereof in the oil-water separation field. The hybrid membrane provided by the invention has good flexibility and mechanical strength, very low adhesive force to oil stain, and very strong pollution resistance, and can realize oil-water separation of high viscosity crude oil and oil-water emulsion. The hybrid membrane also has the advantages of simple preparation, low cost, green and no pollution, and recyclability, and is expected to realize large-scale production and application.

Description

technical field [0001] The invention belongs to the technical field of oil-water separation membrane preparation, and in particular relates to a superhydrophilic and underwater superoleophobic calcium carbonate hybrid membrane, a preparation method and application thereof. Background technique [0002] In recent years, with the rapid development of the economy, the pollution of the environment has become more and more serious, and the pollution of water by oil pollution has attracted more and more attention. In addition to water pollution caused by oil exploration and oil spills, domestic sewage and sewage discharged from various manufacturing industries such as textiles, leather, metal, food, machinery and chemical industries also contain a large amount of oil pollution, which has brought serious pollution to water bodies. pollution. Therefore, it is imminent to research and develop materials and technologies that can realize oil-water separation. At present, a large numb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/74B01D71/02B01D69/02B01D67/00B01D17/02B01D17/022
CPCB01D17/02B01D17/0202B01D67/0079B01D69/02B01D71/02B01D71/74B01D2325/36
Inventor 汪秀丽袁雪宋飞肖倩罗艳葵徐晨聂武成王玉忠
Owner SICHUAN UNIV
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