CN209997464U

CN209997464U - organic silicon hybrid membranes

Info

Publication number: CN209997464U
Application number: CN201920287905.XU
Authority: CN
Inventors: 廖明佳; 贺小兰; 蒋清梅
Original assignee: Chongqing Chemical Industry Vocational College
Current assignee: Chongqing Chemical Industry Vocational College
Priority date: 2019-03-07
Filing date: 2019-03-07
Publication date: 2020-01-31
Anticipated expiration: 2029-03-07

Abstract

The utility model discloses an organosilicon hybrid membrane, including ceramic support body 1, ceramic support body 1 left side has set gradually transition layer 2, cellulose layer 3, organosilicon layer 4, second cellulose layer 5, ceramic support body 1 right side has set gradually second transition layer 6, third cellulose layer 7, second organosilicon layer 8, second transition layer 6 is in through the coating mode adhesion ceramic support body 1 is last, third cellulose layer 7 is in through the coating mode adhesion on second transition layer 6, second organosilicon layer 8 is in through the coating mode adhesion on third cellulose layer 7 the permeability of this organosilicon hybrid membrane's water reaches 1.9 x 10^‑13m³·m^‑2·s^‑1·Pa^‑1Interception of salt ionsThe retention rate reaches 99.0 percent.

Description

organic silicon hybrid membranes

Technical Field

The utility model belongs to the membrane material field relates to kinds of organosilicon hybrid membranes.

Background

The aromatic polyamide composite membrane prepared by an interfacial polymerization method has the advantages of high desalination rate, large flux, organic solvent resistance and the like, and dominates the current reverse osmosis membrane market, but the aromatic polyamide membrane has poor pollution resistance, and particles, colloidal particles, organic matters and the like in water are adsorbed on the surface of the membrane to cause membrane pollution, wherein the organic matters and the microbial pollution are difficult to solve, the water flux of the membrane can be rapidly reduced, and the service life of the membrane is greatly shortened.

At the end of the twentieth century, excellent performance bridged organosilicon functional materials received much attention from , such organosilicon materials are typically bridged silsesquioxane (R' O)₃Si–R–Si(OR’)₃Is a silicon source precursor and is obtained by hydrolysis and polycondensation reaction. Compared with the traditional inorganic SiO based on tetraethyl orthosilicate (TEOS)₂Compared with the material, the bridged organosilicon has the advantages of regular structure, adjustable pore channel type, size, surface property and the like. To increase the water permeability of the bridged organosilicon films, different methods have been used for modification. The affinity of the organic silicon membrane to water is obviously improved by regulating the structure of a bridging group, and the-CH 2-CH 2-group bridged by a BTESO network is replaced by introducing more polar-CH-and-C-bridge groups, so that the water permeability of the membrane is improved, but the salt rejection rate is reduced in the reverse osmosis process. Therefore, modifying the membrane material, improving the water permeability and the salt ion rejection rate of the membrane and breaking the mutual restriction relationship is the key point of the research in the field of reverse osmosis membranes at present.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing kinds of organosilicon hybrid membranes, improve the water permeability and the salt ion retention rate of membrane simultaneously, for reaching above-mentioned purpose, the utility model provides a following technical scheme:

A silicone hybrid membrane, comprising a ceramic support (1), wherein the left side of the ceramic support (1) is sequentially provided with a transition layer (2), a cellulose layer (3), a silicone layer (4) and a second cellulose layer (5), the transition layer (2) is adhered to the ceramic support (1) through coating, the cellulose layer (3) is adhered to the transition layer (2) through coating, the silicone layer (4) is adhered to the cellulose layer (3) through coating, the second cellulose layer (5) is adhered to the silicone layer (4) through coating, the right side of the ceramic support (1) is sequentially provided with a second transition layer (6), a third cellulose layer (7) and a second silicone layer (8), the second transition layer (6) is adhered to the ceramic support (1) through coating, the third cellulose layer (7) is adhered to the second transition layer (6) through coating, and the second cellulose layer (7) is adhered to the second transition layer (8) through coating.

, the ceramic support body (1) is α -Al₂O₃The thickness of the ceramic film is 500-1000 nm.

, the transition layer (2) is silica sol, the second transition layer (6) is zirconium sol, and the thickness of the second transition layer is 50-100 nm.

, the organic silicon layer (4) and the second organic silicon layer (8) are bis (triethoxy silicon) methane films, and the thickness is 400-500 nm.

, the cellulose layer (3), the second cellulose layer (5) and the third cellulose layer (7) are hydroxypropyl cellulose films, and the thickness is 200-300 nm.

, the transition layer (2) and the second transition layer (6) are equal in thickness and are arranged equidistantly.

The utility model has the advantages that α -Al is used₂O₃The cellulose layer rich in hydroxyl is alternately and stably distributed in the organic silicon film layer in order, so that the hydrophilicity of the film can be effectively improved, the organic silicon layer can enable the film structure to be more compact, and the hybrid structure can simultaneously improve the pair of hybrid filmsThe permeability of water and the retention rate (apparent retention rate) of salt ions enable the permeability of water to reach 1.9 multiplied by 10^-13m³·m^-2·s^-1·Pa^-1The retention rate of salt ions reaches 99.0%.

Drawings

Fig. 1 is a schematic structural view of the present invention;

in the figure, 1 ceramic support, 2 th th transition layer, 3 rd th cellulose layer, 4 th th organosilicon layer, 5 th cellulose layer,

6 second transition layer, 7 third cellulose layer, 8 second silicone layer.

Fig. 2 is a long-term stability test chart of the silicone hybrid membrane.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1

As shown in FIG. 1, the present invention provides embodiments, organosilicon hybrid membranes, including a ceramic support 1, wherein the left side of the ceramic support 1 is sequentially provided with a 0 th transition layer 2, a th cellulose layer 3, a th organosilicon layer 4, and a second cellulose layer 5, the th transition layer 2 is adhered to the ceramic support 1 by coating, the th cellulose layer 3 is adhered to the th transition layer 2 by coating, the th organosilicon layer 4 is adhered to the th cellulose layer 3 by coating, the second cellulose layer 5 is adhered to the th organosilicon layer 4 by coating, the right side of the ceramic support (1) is sequentially provided with a second transition layer 6, a third cellulose layer 7, and a second organosilicon layer 8, the second transition layer 6 is adhered to the ceramic support 1 by coating, the third cellulose layer 7 is adhered to the second transition layer 6 by coating, the second organosilicon layer 8 is adhered to the third cellulose layer 637 by coating, the ceramic support 1 is Al 1- 1₂O₃A ceramic film, the thickness of which is 800nm, the thickness of the th transition layer 2 is silica sol, the thickness of the second transition layer 6 is zirconium sol, the thickness of which is 80nm, the thickness of the th organic silicon layer 4 and the thickness of the second organic silicon layer 8 are bis (triethoxysilyl) methane films, the thickness of which is 450nm, the thickness of the th cellulose layer 3,The second cellulose layer 5 and the third cellulose layer 7 are hydroxypropyl cellulose films and have a thickness of 250nm, and the th transition layer 2 and the second transition layer 6 are equal in thickness and equal in distance.

Example 2 film Performance testing

And (3) adopting a reverse osmosis device to carry out performance test on the membrane, conveying the raw material liquid to the membrane component by using a high-pressure constant flow pump at the flow rate of 10mL/min, and stirring the NaCl solution in the membrane component by using an external magnetic stirrer (the rotating speed is 300r/min) so as to reduce the concentration polarization effect. The experimental operating pressure is controlled by the membrane interception side through a precision back pressure valve, and the feed liquid on the interception side is circulated to the feed tank. Before testing, the reverse osmosis system is firstly operated for at least 5h to ensure that the membrane mass transfer process reaches a stable state, then sampling is carried out at intervals of preset time intervals, the quality of the penetrating fluid is measured, and the salt ion concentration in the penetrating fluid is analyzed.

The effect of the silicone hybrid membrane on the reverse osmosis desalination performance results: water permeability Lp of 1.9X 10^-13,m³·m^-2·s^-1·Pa^-1Apparent retention rate R_obsThe content was 99.0%.

Example 3 Effect of operating time on reverse osmosis Performance

FIG. 2 is the long term stability of the organosilicon hybrid membrane during temperature change, from which it can be seen that the apparent rejection R of the membrane is obtained during 50h of continuous reverse osmosis desalination_obsThe change is not big, remains more than 97% throughout, shows that the network structure of membrane does not take place great change, proves the utility model discloses an organosilicon hybridization membrane has good hydrothermal stability.

Finally, although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

A silicone hybrid membrane, which is characterized in that the membrane comprises a ceramic support (1), wherein the left side of the ceramic support (1) is sequentially provided with a transition layer (2), a cellulose layer (3), a silicone layer (4) and a second cellulose layer (5), the transition layer (2) is adhered to the ceramic support (1) in a coating mode, the cellulose layer (3) is adhered to the transition layer (2) in a coating mode, the silicone layer (4) is adhered to the cellulose layer (3) in a coating mode, the second cellulose layer (5) is adhered to the silicone layer (4) in a coating mode, the right side of the ceramic support (1) is sequentially provided with a second transition layer (6), a third cellulose layer (7) and a second silicone layer (8), the second transition layer (6) is adhered to the ceramic support (1) in a coating mode, the third cellulose layer (7) is adhered to the second silicone layer (7) in a coating mode, and the second transition layer (6) is adhered to the second silicone layer (8) in a coating mode.
2. The hybrid silicone membranes according to claim 1, wherein the ceramic support (1) is α -Al₂O₃The thickness of the ceramic film is 500-1000 nm.
3. The silicone hybrid film according to claim 1, wherein the transition layer (2) and the second transition layer (6) are SiO₂–ZrO₂The thickness of the sol is 50-100 nm.
4. The kinds of silicone hybrid membranes according to claim 1, wherein the st and second silicone layers (4, 8) are bis (triethoxysilyl) methane membranes with a thickness of 400-500 nm.
5. The kinds of silicone hybrid membranes according to claim 1, wherein the th cellulose layer (3), the second cellulose layer (5), and the third cellulose layer (7) are hydroxypropyl cellulose films with a thickness of 200-300 nm.
6. The silicone hybrid film according to claim 1, wherein the transition layer (2) and the second transition layer (6) are equal in thickness and are disposed equidistantly.