Preparation method of composite forward osmosis membrane added with acid-activated black talc nano material

A nanomaterial and forward osmosis membrane technology is applied in the field of preparation of acid-activated black talc nanomaterial composite forward osmosis membranes, which can solve the problems of low flux and concentration polarization of polyamide composite forward osmosis membranes, and achieve a reduction in Small concentration polarization problem, high rejection rate, the effect of improving permeation flux

Active Publication Date: 2021-06-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defects of the existing polyamide composite forward osmosis membrane with low membrane flux and serious concentration polari

Method used

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  • Preparation method of composite forward osmosis membrane added with acid-activated black talc nano material
  • Preparation method of composite forward osmosis membrane added with acid-activated black talc nano material
  • Preparation method of composite forward osmosis membrane added with acid-activated black talc nano material

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Effect test

Embodiment 1

[0036] (1) Preparation of acid-activated black talc nanomaterials

[0037] 10 g of black talc (the black talc originates from Guangfeng District, Shangrao City, Jiangxi Province) was ball milled, wet-milled with a ball mill at 600 r / min for 5 h, washed with water, centrifuged and dried to obtain 8.8 g of black talc nanoparticles. Vigorously stirring the black talc nanoparticles in deionized water at room temperature for one week, fully exfoliated, to obtain the black talc nanomaterials (average particle diameter is 220nm). Add 0.5 g of the above-prepared black talc nanomaterials to 20 mL of 65% nitric acid solution, reflux at 90 °C for 5 h, wash the acidified powder after reflux, centrifuge at 5000 r / min for 10 min, and dry in a vacuum oven at 120 °C.

[0038] (2) Preparation of polymer porous support layer

[0039] Dissolve 4.96g polysulfone in 30mL N,N-dimethylacetamide solution, let stand to defoam, form a stable and uniform casting solution, scrape the casting solution on...

Embodiment 2

[0044] (1) Preparation of acid-activated black talc nanomaterials

[0045] 10 g of black talc (the black talc originates from Guangfeng District, Shangrao City, Jiangxi Province) was ball milled, wet-milled with a ball mill at 600 r / min for 5 h, washed with water, centrifuged and dried to obtain 8.8 g of black talc nanoparticles. Vigorously stirring the black talc nanoparticles in deionized water at room temperature for one week, fully exfoliated, to obtain the black talc nanomaterials (average particle diameter is 220nm). Add 0.4g of the above-prepared black talc nanomaterials to 20mL of 65% nitric acid solution, reflux at 90°C for 6h, wash the acidified powder after reflux, centrifuge at 5000r / min for 10min, and dry in a vacuum oven at 120°C.

[0046] (2) Preparation of polymer porous support layer

[0047] Dissolve 3.675g of polyethersulfone in 20mL of N-methylpyrrolidone solution, let it stand for degassing, and form a stable and uniform casting solution, scrape the casti...

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Abstract

The invention provides a preparation method of a composite forward osmosis membrane added with an acid-activated black talc nano-material, which comprises the following steps: firstly preparing the acid-activated black talc nano-material, then doping the acid-activated black talc nano-material into a polyamine aqueous phase solution, and carrying out interfacial polymerization on the polyamine aqueous phase solution and an organic phase solution of a polyacyl chloride monomer on a polymer porous support layer to prepare the composite forward osmosis membrane, and introducing the polyamide layer into the black talc layered nano-material, so that the surface structure of the PA layer can be effectively adjusted, the permeation flux is improved, acid activation can cause decomposition of clay particles and increase of the surface area and the pore diameter, meanwhile, introduction of a hydroxyl structure is achieved in the acid activation process, and therefore the hydrophilicity of the black talc nano-material is improved. According to the composite forward osmosis membrane modified by adding the acid activated black talc nano material, the problem of concentration polarization in the forward osmosis process is effectively solved, the water flux of the forward osmosis membrane is improved, and it is guaranteed that the forward osmosis membrane has the high rejection rate.

Description

technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to a preparation method of a composite forward osmosis membrane activated by adding acid to activate black talc nanomaterials. Background technique [0002] Water pollution and shortage of water resources have become global challenges, and the scarcity of water resources has become a key factor restricting social progress and economic development. Membrane technology plays an important role in solving resource-based water shortage, energy structure adjustment and new energy development, and water environment protection. Forward osmosis (FO) is a new concentration-driven membrane separation technology developed in recent years. It is a membrane separation process that relies on the osmotic pressure difference on both sides of the selective permeation membrane as the driving force to realize water transfer spontaneously. At present, it is one of the hotspots in the fiel...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D69/10B01D69/02B01D61/00
CPCB01D67/0079B01D69/125B01D69/10B01D69/02B01D61/002B01D2325/36
Inventor 张国亮范子璇孟琴
Owner ZHEJIANG UNIV OF TECH
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