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Method for separating dye-containing wastewater based on porous polymer-modified metal carbon nanotube composite membrane

A carbon nanotube composite and porous polymer technology, which is applied in semipermeable membrane separation, chemical instruments and methods, and textile industrial wastewater treatment, can solve the problems of poor separation effect and insufficient separation efficiency

Active Publication Date: 2021-04-30
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbon nanotube nanoporous membrane has poor separation effect on various dyes, and the separation efficiency of 100ppm dye aqueous solution is less than 60%.

Method used

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  • Method for separating dye-containing wastewater based on porous polymer-modified metal carbon nanotube composite membrane
  • Method for separating dye-containing wastewater based on porous polymer-modified metal carbon nanotube composite membrane
  • Method for separating dye-containing wastewater based on porous polymer-modified metal carbon nanotube composite membrane

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Experimental program
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Effect test

preparation example

[0028] Preparation example The preparation of porous polymer-modified metal carbon nanotube composite film, the specific steps are as follows:

[0029] (1) Synthesis of modified multi-walled carbon nanotube (MWCNT) films. First, 30 ml of concentrated hydrochloric acid and 10 ml of concentrated nitric acid were prepared into aqua regia at a volume ratio of 3:1, and the existing MWCNT film was placed in it and soaked at 50 °C for 6 hours for acidification. Then, the acidified MWCNT film Wash with ultrapure water and dry;

[0030] Accurately weigh 0.112 g of zirconium tetrachloride and 0.087 g of terephthalic acid, dissolve them in 60 ml of N,N-dimethylformamide (DMF), then sonicate for 20 minutes, and subsequently, add 8.3 Milliliter of acetic acid to obtain the mixture, then transfer the mixture and acidified dried MWCNT film (10*10 cm2) into a 100 ml stainless steel autoclave, heat at 120 °C for 24 hours; after natural cooling, wash with DMF and methanol, Finally, dry at 60 ...

Embodiment 1

[0038]The Congo red aqueous solution with a concentration of 100ppm is introduced into the high-pressure stirring tank of the filter equipment, and argon gas is introduced to pressurize to 3.0 bar (bar). Under the action of pressure, the separation of dye-containing wastewater is completed; the filter membrane is loaded with Metal modified MWCNT membranes or composite membranes modified with porous polymers.

[0039] See attached figure 2 , the separation efficiency of the composite membrane modified with porous polymer was 97.7% (Congo red); see attached image 3 , the separation efficiency of the metal-loaded modified MWCNT membrane was 95.6% (Congo red).

[0040] At the same time, the circular separation effect on the dye solution was tested. After the first separation, it was washed with water, dried and then separated again; see attached Figure 4 , after 5 cycles, the separation efficiency of Congo red by the composite membrane modified with porous polymer can be kept...

Embodiment 2

[0042] The rhodamine B aqueous solution with a concentration of 100ppm is introduced into the high-pressure stirring tank of the filter equipment, and argon is introduced to pressurize to 3.0 bar (bar). Under the action of pressure, the separation of dye-containing wastewater is completed; the filter membrane is the load Metal-modified MWCNT membranes or composite membranes modified with porous polymers.

[0043] See attached Figure 5 , the separation efficiency of the composite membrane modified with porous polymer was 91.9% (rhodamine B), see attached Figure 6 , the separation efficiency of the modified MWCNT membrane loaded with metal is 61.0% (rhodamine B), and the separation efficiency of the composite membrane can be significantly improved;

[0044] At the same time, the circular separation effect on the dye solution was tested. After the first separation, it was washed with water, dried and then separated again; see attached Figure 7 , after 5 cycles, the separatio...

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Abstract

The invention discloses a method for separating dye-containing wastewater based on a porous polymer-modified metal carbon nanotube composite membrane. The method comprises the following steps: mixing an acidified carbon nanotube membrane with a modification solution, and carrying out heating reaction to obtain a modified carbon nanotube membrane; then coating the surface of the modified carbon nanotube film with polyethylene glycol, then coating the surface with a porous polymer solution, and carrying out heating treatment to obtain a porous polymer modified metal carbon nanotube composite film; and enabling the dye-containing wastewater to pass through a porous polymer modified metal carbon nanotube composite membrane to finish separation of the dye-containing wastewater. According to the method, the metal carbon nanotube composite membrane coated with the porous polymer is successfully prepared, the composite membrane can provide proper pore diameter and porosity required by dye separation, the polymer coating mainly plays a role in enhancing the stability and durability of the membrane, the crystal defects possibly occurring in the metal growth process are overcome, the separation efficiency of multiple tested dyes reaches 90% or above, and the method has great application potential.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for separating dye-containing wastewater by using a metal carbon nanotube composite membrane modified by a porous polymer. Background technique [0002] In the textile printing and dyeing industry, the use of dyes is very large, so the discharged industrial wastewater often contains a variety of dyes, which has become one of the important reasons for water pollution. The dyes in wastewater can absorb light, reduce the transparency of water, affect the growth of aquatic organisms and microorganisms, not conducive to the self-purification of water, and even seriously affect human health. At present, in order to solve the dyes contained in sewage, various water purification processes have been developed, such as chemical oxidation, adsorption, photodegradation, biodegradation, and membrane separation, etc. Each of these methods has advantages and disad...

Claims

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Application Information

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IPC IPC(8): C02F1/44B01D71/02B01D69/12B01D67/00C02F103/30
CPCC02F1/442B01D71/021B01D69/12B01D67/0088C02F2103/30C02F2101/40C02F2101/38C02F2101/34Y02W10/10
Inventor 路建美陈冬赟
Owner SUZHOU UNIV
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