Sodium alginate-graphite phase carbon nitride nano-sheet hybridized composite membrane as well as preparation and application of composite membrane

A technology of graphite phase carbon nitride and sodium alginate, applied in the field of membrane separation, can solve problems such as difficult and efficient separation, and achieve the effects of high separation performance, easy availability of raw materials and mild conditions

Inactive Publication Date: 2015-07-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The ethanol / water mixture is an azeotropic system, and the traditional distillation method is difficult to achieve efficient separation between components, so fuel ethanol dehydration has become a key technology for fuel ethanol production

Method used

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  • Sodium alginate-graphite phase carbon nitride nano-sheet hybridized composite membrane as well as preparation and application of composite membrane
  • Sodium alginate-graphite phase carbon nitride nano-sheet hybridized composite membrane as well as preparation and application of composite membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1, a kind of sodium alginate-graphite carbon nitride nanosheet hybrid composite film, its preparation process is as follows:

[0019] Step 1. Add sodium alginate to deionized water and stir at 30°C for 2 hours to prepare a sodium alginate solution with a mass concentration of 1.5% for use;

[0020] Step 2, using melamine as raw material, using the method of combining thermal exfoliation and liquid phase exfoliation, to prepare graphitic carbon nitride nanosheets: put 5 g of melamine in a crucible, put it into a muffle furnace and bake it at 550 ° C for 4 hours, then heat up Both the heating rate and the cooling rate were controlled at 3°C / min to obtain a yellow powder; after grinding the yellow powder with a mortar, it was put into a muffle furnace and roasted at 500°C for 2h, and the heating rate and cooling rate were both controlled at 5°C / min. min to obtain graphite phase carbon nitride powder; at room temperature, disperse the graphite phase carbon nitrid...

Embodiment 2

[0025] Embodiment 2, a kind of sodium alginate-graphite phase carbon nitride nanosheet hybrid composite film, its preparation process is basically the same as embodiment 1, the only difference is that in step 3, the amount of graphite phase carbon nitride nanosheet by Accounting for 1wt.% of sodium alginate is changed to account for 2wt.% of sodium alginate.

[0026] The sodium alginate-graphite phase carbon nitride nanosheet hybrid composite membrane prepared in Example 2 was used to test the ethanol / water separation performance. Using membrane separation equipment, the ethanol / water separation performance test was carried out at 76°C and the mass ratio of ethanol / water in the raw material solution was 9:1, and the permeation flux was 2232g / m 2 h, the separation factor is 1254.

Embodiment 3

[0027] Embodiment 3, a kind of sodium alginate-graphite phase carbon nitride nanosheet hybrid composite film, its preparation process is basically the same as embodiment 1, the only difference is that in step 3, the amount of graphite phase carbon nitride nanosheet by Accounting for 1wt.% of sodium alginate is changed to account for 3wt.% of sodium alginate. The high-magnification SEM cross-sectional photos of the sodium alginate-graphite phase carbon nitride nanosheet hybrid composite film finally obtained are as follows: figure 1 shown.

[0028] The sodium alginate-graphite phase carbon nitride nanosheet hybrid composite membrane prepared in Example 3 was used to test the ethanol / water separation performance. Using membrane separation equipment, the ethanol / water separation performance test was carried out at 76°C and the mass ratio of ethanol / water in the raw material solution was 9:1, and the permeation flux was 2469g / m 2 h, the separation factor is 1653.

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Abstract

The invention relates to a sodium alginate-graphite phase carbon nitride nano-sheet hybridized composite membrane. The composite membrane is prepared by the steps of firstly, with melamine as the raw material, preparing ultrathin and porous graphite phase carbon nitride nano-sheet by using a hot separation and liquid-phase separation combined method; blending the nano-sheet and sodium alginate to obtain a casting membrane liquid; defoaming, then preparing the membrane by using a spin-coating method; performing cross-linking with a calcium chloride solution; and finally drying to obtain the sodium alginate-graphite phase carbon nitride nano-sheet hybridized composite membrane. According to the hybridized composite membrane, by virtue of the structure characteristic that the graphite phase carbon nitride nano-sheet is planar, ultrathin and porous, the thicknesses of separation layers are reduced; an orderly transmission channel is built; the transmission resistance of water molecule is lowered; the ethyl alcohol molecule is prevented from transmitting; therefore the osmosis and the selectivity of the membrane are improved simultaneously. According to the hybridized composite membrane, the preparation process is simple, raw materials are easily available and the structure is controllable, and the composite membrane is used for ethyl alcohol/water mixture separation, and has relative high osmosis flux and separation coefficient.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a sodium alginate-graphite phase carbon nitride nanosheet hybrid composite membrane and its preparation and application. Background technique [0002] Energy and the environment are major challenges facing the world in the 21st century, and fuel ethanol, as a renewable clean energy, has attracted widespread attention. The ethanol / water mixture is an azeotropic system, and it is difficult to achieve efficient separation of components by traditional distillation methods. Therefore, dehydration of fuel ethanol has become a key technology for fuel ethanol production. As a new separation technology, pervaporation technology uses different physical and chemical interactions between the components of the feed liquid and the membrane material to achieve separation, and is not limited by the vapor-liquid balance. High advantages, showing outstanding advantages for the separation of aze...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D67/00B01D71/08B01D71/42B01D71/68B01D71/56B01D61/36
Inventor 姜忠义曹克腾潘福生张晓珊杨森
Owner TIANJIN UNIV
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