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Ion concentration polarization chip based on graphene porous membrane and preparation method of ion concentration polarization chip

A technology of concentration polarization and graphene, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve problems such as expensive, difficult to obtain, and device damage, and achieve low price, easy preparation, The effect of convenient control

Active Publication Date: 2017-07-07
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Nafion also has the following disadvantages in the process of use: (1) It is expensive and difficult to obtain; (2) Nafion has strong acidity, which may have a certain destructive effect on the device itself ([3] Xu Baiqing. The new form of perfluorosulfur Acid Resin—Silicon Oxide Assembly Nano-Nafion Solid Acid Preparation and Catalytic Application[J]

Method used

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  • Ion concentration polarization chip based on graphene porous membrane and preparation method of ion concentration polarization chip
  • Ion concentration polarization chip based on graphene porous membrane and preparation method of ion concentration polarization chip
  • Ion concentration polarization chip based on graphene porous membrane and preparation method of ion concentration polarization chip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: The influence of precursor solutions containing different graphene oxide and PVDF polymer solid contents on the desalination effect of brine.

[0034] 1. Take 10g of PVDF powder, add 90g of DMF, and after a long time of ultrasonication and stirring, obtain a precursor mother liquor with a uniformly dissolved solid content of 10%.

[0035]2. Take 1.76g, 2.21g, 2.65g, 3.09g, and 3.52g of PVDF mother liquor, respectively, add 0.94g, 1.18g, 1.41g, 1.65g, and 1.88g of graphene oxide, and supplement DMF to 10g. Stir until evenly mixed to obtain a precursor solution with a ratio of graphene oxide to PVDF of 1:7.5, and the solid phase content concentrations are 2%, 2.5%, 3%, 3.5%, and 4%, respectively. The solid phase content of the typical object after drying is 2.5%.

[0036] 3. Take 40g of PDMS prepolymer, add 4g of curing agent, and stir evenly. Take 5ml of it and drop it on the center of the silicon wafer with the template of the Y-shaped channel, rotate evenl...

Embodiment 2

[0042] Example 2: Effects of graphene composite films with different ratios of graphene oxide and PVDF polymer on the desalination effect of salt water.

[0043] 1. Take 10g of PVDF powder, add 90g of DMF, and after a long time of ultrasonication and stirring, obtain a precursor mother liquor with a uniformly dissolved solid content of 10%.

[0044] 2. Take 1.67g, 1.82g, 1.88g, 1.90g, 1.92g of PVDF mother liquor, 1.33g, 0.73g, 0.50g, 0.38g, 0.31g of graphene oxide added respectively, and add DMF to 10g. Stir until they are evenly mixed to obtain precursor solutions with a solid content of 2% and a ratio of graphene oxide to PVDF of 1:5, 1:10, 1:15, 1:20, and 1:25, respectively.

[0045] 3. Same as Step 3 of Example 1.

[0046] 4. Same as Step 4 of Example 1.

[0047] 5. Same as Step 5 of Example 1.

[0048] 6. Same as Step 6 of Example 1.

[0049] 7. Same as Step 7 of Example 1.

[0050] 8. With step 8 of embodiment 1, the desalination rate curve is obtained as Figure 5...

Embodiment 3

[0051] Example 3: Effect of composite films of graphene oxide and different polymers on the desalination effect of brine.

[0052] 1. Take 10g each of PVDF, PEI, polydopamine, and chitosan powder, add 90g DMF, and after a long time of ultrasonication and stirring, obtain a precursor mother liquor with a uniform dissolution and a solid content of 10%.

[0053] 2. Take 4 parts of 1.76g of the precursor mother liquor, add 0.94g of graphene oxide respectively, stir until the mixture is uniform, and obtain the precursor solution of graphene oxide and different polymer composite materials.

[0054] 3. Same as Step 3 of Example 1.

[0055] 4. Same as Step 4 of Example 1.

[0056] 5. Same as Step 5 of Example 1.

[0057] 6. Same as Step 6 of Example 1.

[0058] 7. Same as Step 7 of Example 1.

[0059] 8. With step 8 of embodiment 1, the desalination rate curve is obtained as Image 6 shown.

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Abstract

The invention provides an ion concentration polarization chip based on a graphene porous membrane and a preparation method of the ion concentration polarization chip and relates to ion concentration polarization chips. The ion concentration polarization chip comprises a glass base, PDMS substrates, a buffer solution water inlet / outlet and a graphene-based porous membrane in a first PDMS substrate, wherein the first PDMS substrate is provided with a Y-shaped groove, and a second PDMS substrate is provided with an I-shaped groove. The preparation method comprises the following steps: preparing graphene-based precursor slurry; producing a chip; and smearing a notch of a Y channel with the graphene-based precursor slurry, and curing, so as to obtain the ion concentration polarization chip. The preparation method has the beneficial effects that the process is simple, and the chip is low in cost and easy to prepare; graphene materials are weakly acidic and have low damage to devices; and the conductivity of the graphene materials is conveniently regulated and controlled, surface functional groups and electric charges are easily regulated and controlled, and the graphene materials can be composited with a large number of materials so as to prepare composite films and devices. Compared with a NaFion-base chip, a relatively stable and relatively large-range exhaustion region can be formed by the graphene-based chip.

Description

technical field [0001] The invention relates to an ion concentration polarization chip, in particular to an ion concentration polarization chip based on a graphene porous membrane and a preparation method thereof. Background technique [0002] Ion concentration polarization is a phenomenon that occurs when electricity is applied to an electrolyte solution in a microchannel. An ion-selective nanochannel is set in the microchannel. When the current flows through the microchannel, in order to ensure the current balance of the entire channel, an ion depletion region and an ion enrichment region are formed at both ends of the nanochannel. The polarized chip based on ion concentration is a chip that separates and concentrates ions by using the ion depletion region and enrichment region at both ends of the nanochannel in the microchannel. Ion concentration polarization chips can be used in seawater desalination, ion concentration and biological detection, and have broad applicatio...

Claims

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Application Information

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IPC IPC(8): C02F1/44B01D63/00B01D69/12B01D67/00C02F103/08
CPCB01D63/005B01D67/0079B01D69/12C02F1/442C02F2103/08Y02A20/131
Inventor 李鑫何翔肖代琴黄海宁陈宏
Owner XIAMEN UNIV
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