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A preparation method of porous carbon-carbon nanotube hollow fiber membrane that generates hydroxyl radicals under electrochemical strengthening

A technology of carbon nanotubes and porous carbon, which is applied in the field of preparation of porous carbon-carbon nanotube hollow fiber membranes, can solve the problems of inability to form a skeleton, unfavorable practical application, and low mechanical strength

Active Publication Date: 2020-12-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, porous carbon is mostly granular, cannot form a skeleton after calcination, and has low mechanical strength, which is not conducive to practical application.

Method used

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  • A preparation method of porous carbon-carbon nanotube hollow fiber membrane that generates hydroxyl radicals under electrochemical strengthening
  • A preparation method of porous carbon-carbon nanotube hollow fiber membrane that generates hydroxyl radicals under electrochemical strengthening
  • A preparation method of porous carbon-carbon nanotube hollow fiber membrane that generates hydroxyl radicals under electrochemical strengthening

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of porous carbon-carbon nanotube hollow fiber membrane is as follows:

[0043]Step 1: Weigh 7.4350g of zinc nitrate hexahydrate and pour it into 500ml of methanol; weigh another 2.0520g of 2-methylimidazole and 3.2675g of triethylamine and dissolve them in new 500ml of methanol. Mix well. After the mixed solution was continued to be sonicated for 30 min, the mixed solution was left to stand for 4 hours to obtain 2-dimensional nanosheets. The desired Zif-8 was obtained by suction filtration and drying.

[0044] Step 2: Weigh a certain mass (2-4g) of Zif-8 in a tube furnace, program the temperature to 1000°C, and calcinate for 2 hours, the protective gas is H 2 and N 2 Mixed gas (volume ratio 1:1), after calcination and cooling to room temperature, the desired porous carbon can be obtained.

[0045] Step 3: Put 1 g of carbon nanotubes in a mixed acid solution of concentrated nitric acid and concentrated sulfuric acid (volume ratio 1:3), heat to ...

Embodiment 2

[0052] Using the patent application with publication number CN109384307A: A construction principle of a membrane bioreactor with electrochemically strengthened carbon nanotube hollow fiber membrane as the separation unit to build an experimental filtration device, replace the carbon nanotube hollow fiber membrane in the membrane bioreactor The porous carbon-carbon nanotube hollow fiber membrane prepared by the method of Example 1 is used as the anode, and the titanium mesh is used as the cathode, and the experimental filter device does not need to use activated sludge. Other parts and connections in the device refer to CN109384307A . Among them, the porous carbon-carbon nanotube hollow fiber membrane module in the experimental filtration device is a membrane module formed by connecting six porous carbon-carbon nanotube hollow fiber membranes in parallel, and the porous carbon-carbon nanotube hollow fiber membrane is used as the cathode. Negative electrode, and the effective ar...

Embodiment 3

[0056] Utilize the filtration device of embodiment 2, test the generation of hydroxyl free radical under the effect of porous carbon-carbon nanotube hollow fiber membrane prepared in electrochemical strengthening embodiment 1:

[0057] Under the condition of sufficient dissolved oxygen exposure in the system, the effects of iron ions (0.2mM, from ferrous sulfate) and electrification on the production of hydroxyl radicals were investigated respectively. The result is as Figure 4 As shown, four peak signals with an intensity ratio of 1:2:2:1 appeared in the electrically assisted (-0.8V) porous carbon-carbon nanotube hollow fiber membrane, which is similar to a typical free radical spin adduct . Meanwhile, no typical peak signal appeared on the porous carbon-carbon nanotube hollow fiber membrane without electrical assistance, which indicated that OH was generated under electrical assistance. Furthermore, in the absence of Fe 2+ In the case of electrically assisted porous carb...

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Abstract

The invention belongs to the technical field of nano-material assembly, and relates to a preparation method of a porous carbon-carbon nano-tube hollow fiber membrane capable of generating hydroxyl radicals under an electrochemical strengthening effect. The preparation method comprises the following steps: 1, preparing a porous carbon precursor Zif-8; 2, preparing porous carbon; 3, acidifying the carbon nanotube in a concentrated acid solution to introduce a hydrophilic group; 4, forming a uniformly mixed spinning solution; 5, performing wet spinning operation to form a hollow fiber membrane; 6and 7, respectively removing the organic solvent and PVB to form the target material. The preparation process is simple, expensive equipment is not needed, and the method is flexible and controllable. Under the electric auxiliary effect, H2O2 is generated through reduction of O2; then, hydroxyl radicals are generated through coupling of H2O2 and Fe <2+> and are used for degrading pollutants; in addition, Fe <3+> is reduced into Fe <2+> through electric assistance. Therefore, the method achieves effective circulation of Fe <2+> / Fe <3+>.

Description

technical field [0001] The invention relates to a method for preparing a porous carbon-carbon nanotube hollow fiber membrane capable of generating hydroxyl radicals under the action of electrochemical strengthening, and belongs to the technical field of nanomaterial assembly. Background technique [0002] Membrane fouling is the main technical obstacle of membrane separation technology, which greatly limits the application of membrane separation technology. Many research scholars have put forward many solutions to alleviate membrane fouling. Among them, electrochemical technology has attracted much attention because of its stable and efficient removal of pollutants on the surface of membrane materials. Electrochemical repulsion repels like-charged pollutants away from the surface of the membrane material. Electrochemical oxidation can non-selectively oxidize and remove pollutants on the surface and inside of the membrane material. And the OH, O generated by electrification...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/08B01D67/00
CPCB01D67/0067B01D69/08B01D71/021
Inventor 乔森杨月全燮
Owner DALIAN UNIV OF TECH
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