Preparation and water treatment application of super-hydrophobic stainless steel-carbon nanotube composite membrane

A carbon nanotube composite, stainless steel technology, applied in water/sewage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc. To achieve the effect of achieving anti-pollution and anti-corrosion properties, and enhancing anti-pollution and anti-corrosion properties

Active Publication Date: 2020-08-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, membrane fouling and membrane corrosion are the key technical bottlenecks that limit its wide application
In addition, the porous stainless steel metal membrane carrier generally exhibits slight hydrophobicity, coupled with its large micron-scale pore size, no matter whether it is a pressure-driven liquid membrane process or a steam-driven membrane distillation process, it does not have the ability to intercept salt, organic matter and water purification. , the preparation of stainless steel membranes with higher hydrophobicity (such as superhydrophobicity) and higher liquid entry pressure requires further development and design

Method used

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  • Preparation and water treatment application of super-hydrophobic stainless steel-carbon nanotube composite membrane
  • Preparation and water treatment application of super-hydrophobic stainless steel-carbon nanotube composite membrane
  • Preparation and water treatment application of super-hydrophobic stainless steel-carbon nanotube composite membrane

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Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: preparation of stainless steel carrier

[0033]The preparation of the stainless steel carrier is very important for the subsequent research on the formation of the stainless steel-carbon nanotube composite membrane and the water treatment performance. In this example, the stainless steel hollow fiber carrier is selected for illustration. Dissolve an appropriate amount of PES (5g) and additive PVP (3g) in NMP (PES:NMP=1:4), put it into a polytetrafluoroethylene ball mill tank, and perform wet ball milling on a planetary ball mill for 6 hours to form a homogeneous mixture. Phase organic solution was prepared as polymer slurry. The stainless steel powder is placed in an oven to dry in advance, and then a certain amount of powder is weighed and added to the above polymer solution for continuous ball milling for 24 hours to prepare a casting film slurry with a solid content of 75%. Then place it in a closed drying oven and vacuumize for 30min to remove the air...

Embodiment 2

[0035] Embodiment 2: Preparation of stainless steel-carbon nanotube composite film

[0036] (1) Surface activation of stainless steel carrier

[0037] The stainless steel membrane has an asymmetric structure of porous surface and exhibits hydrophobicity with a water contact angle of ∼122°. The stainless steel film contains Ni and Fe elements, and carbon nanotubes can be constructed in situ on the stainless steel film without an external catalyst. Through simple surface activation, that is, the oxidation-reduction process, the surface activation of the catalytic sites of the stainless steel carrier is carried out, and the pores of the stainless steel carrier are filled with water by immersion in tap water containing oxygen at atmospheric pressure for 3 hours, and the stainless steel carrier filled with water is placed on the Heat and oxidize in an air atmosphere at 60°C for 48 hours to fully oxidize the passivation layer on the surface of the stainless steel film. Place the o...

Embodiment 3

[0040] Example 3: Application of stainless steel-carbon nanotube composite membrane in the treatment of high-salt wastewater

[0041] Vacuum membrane distillation experiments were carried out at different temperatures (55°C, 65°C, 75°C, 85°C, 95°C) with a salinity of 3.5wt.%. The salt rejection rate of the stainless steel-carbon nanotube composite membrane is greater than 99.9%, indicating that the stainless steel-carbon nanotube composite membrane has excellent desalination performance. When the operating temperature increased from 55°C to 95°C, the water flux increased significantly, while the salt rejection rate of the stainless steel-carbon nanotube composite membrane hardly changed; similarly, at different salinities (0.5wt%, 2wt%, 3.5 wt%, 5wt%, 6.5wt%) membrane distillation experiments were carried out at a temperature of 75°C. The results showed that when the salt concentration increased from 0.5wt% to 6.5wt%, the water flux decreased to varying degrees, but the salt ...

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Abstract

The invention provides preparation and water treatment application of a super-hydrophobic stainless steel-carbon nanotube composite membrane, and aims to provide a preparation method of a stainless steel-carbon nanotube composite membrane with high strength, flexibility, super-hydrophobicity and conductivity and a water treatment application technology. With application of a surface activation strategy and an autocatalytic chemical vapor deposition technology, a carbon nanotube functional layer grows on a stainless steel carrier in situ, the stainless steel-carbon nanotube composite membrane is constructed, the treatment performance of high-salinity wastewater and high-organic wastewater is remarkably improved through a micro-electric field assisted membrane distillation process, and in-situ membrane pollution resistance and corrosion resistance are achieved. The membrane preparation method and the membrane application strategy are expected to be expanded to preparation of other conductive metal matrix-carbon nanotube composite membranes and other water treatment separation applications such as separation and purification of high-salt wastewater, antibiotic wastewater and organic dye wastewater.

Description

technical field [0001] The invention relates to the preparation of a stainless steel-carbon nanotube composite membrane and its water treatment application technology, and in particular provides a method for preparing a high-strength, flexible, super-hydrophobic and conductive stainless steel-carbon nanotube composite membrane. Activation and high-temperature chemical vapor deposition process realize in-situ construction of super-hydrophobic, super-porous and conductive carbon nanotube functional layers on the surface of porous stainless steel supports, and strengthen the membrane distillation process through micro-electric field coupling. The ability to treat wastewater has significant anti-corrosion and anti-pollution properties. The membrane preparation method can be extended to the preparation of other conductive metal-carbon nanotube composite membranes, and the membrane application strategy can also be extended to other water treatment or more advanced separation applicat...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00C02F1/44C02F101/30
CPCB01D71/021B01D71/022B01D67/0072C02F1/447C02F2101/308B01D2325/30
Inventor 董应超司一然孙春意黄智锋杨凤林
Owner DALIAN UNIV OF TECH
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