Forward-osmosis organic-inorganic composite membrane and preparation method thereof

An inorganic composite membrane and forward osmosis technology, which is applied in the field of membrane separation, can solve the problem that the flux of forward osmosis is not greatly improved, and achieve the effect of improving water flux, solving susceptibility to microbial contamination, and having wide application potential.

Inactive Publication Date: 2014-03-26
NINGBO LIANHUA ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many research institutions in the world are researching and exploring the preparation of forward osmosis membranes, but in general, the flux of forward osmosis membranes is not greatly improved.

Method used

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  • Forward-osmosis organic-inorganic composite membrane and preparation method thereof
  • Forward-osmosis organic-inorganic composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Forward osmosis organic-inorganic composite membrane and preparation method thereof:

[0034] Adopt cellulose acetate as polymer, add 12g cellulose acetate and 0.4gAg nanoparticle (particle size is 1.5μm) in 87.6g1,4-dioxane solvent, stir and dissolve to form the Ag nanoparticle that content is 0.4wt% The casting solution is used to form a gel in a gel bath, and the prepared membrane is washed with deionized water to remove residual organic solvents to obtain a forward osmosis organic-inorganic composite membrane, which is stored in deionized water for later use.

[0035] After testing, the flux of the forward osmosis organic-inorganic composite membrane prepared in this example is 20L m -2 h -1 , The rejection rate is above 99%.

[0036] The prepared forward osmosis organic-inorganic composite membrane and the membrane without nanoparticles were subjected to microbial contamination experiments under the same conditions. Escherichia coli microorganisms were added to ...

Embodiment 2

[0038] Forward osmosis organic-inorganic composite membrane and preparation method thereof:

[0039] Take by weighing 16g polysulfone polymer, be dissolved in 84g by the mixed solvent that N,N-dimethylacetamide and Polyethylene Glycol 400 form (the ratio of the two is 76:8), be made into polymer concentration and be 18% polysulfone solution. Add 2g of silver-loaded NaA zeolite molecular sieve nanoparticles (particle size: 1.5 μm) with a hexahedral shape to the prepared polysulfone solution, and disperse in ultrasonic for 30 min to prepare NaA type zeolite molecular sieve nanoparticles containing 2wt% silver. Particle casting solution, coating the casting solution on the low-density non-woven support layer, using a scraper with a certain thickness to scrape the film, putting it into a gel bath to form a gel film, using m-phenylenediamine and homophenylene Triformyl chloride was subjected to an interfacial polymerization reaction on the formed membrane (reacted at 110° C. for 3...

Embodiment 3

[0043] Forward osmosis organic-inorganic composite membrane and preparation method thereof:

[0044] Take by weighing 18g polysulfone polymer, 0.6g spherical TiO2 nanoparticle (particle diameter is 2 μ m), be dissolved in the mixed solvent that 82g is made up of N, N-dimethylacetamide and Polyethylene Glycol 400 (both ratios is 72:10), and the casting solution with polysulfone concentration of 18wt% and TiO2 nanoparticle concentration of 0.6wt% was prepared. Coat the casting solution on the low-density non-woven support layer, use a scraper with a certain thickness to scrape the film, put it in a gel bath to form a gel film, and obtain a forward osmosis organic-inorganic composite film, which is stored in deionized water spare.

[0045]After testing, the water flux of the forward osmosis organic-inorganic composite membrane prepared in this example is 22L m -2 h -1 , The rejection rate is above 99%.

[0046] Microbial contamination experiments were carried out on the prepa...

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Abstract

The invention discloses a forward-osmosis organic-inorganic composite membrane. The forward-osmosis organic-inorganic composite membrane comprises at least one bottom membrane layer, wherein the at least one bottom membrane layer contains polymers and nano particles dispersed in the at least one bottom membrane layer; and the water flux of the forward-osmosis organic-inorganic composite membrane is larger than 12L*m<-2>*h<-1>. The invention further discloses a preparation method of the forward-osmosis organic-inorganic composite membrane. The forward-osmosis organic-inorganic composite membrane has the larger contact area with water and has the better hydrophilicity, so that the water flux of the forward-osmosis organic-inorganic composite membrane is increased to a greater degree. Besides, the antibacterial property of the forward-osmosis membrane can be improved remarkably, so that the defect that traditional forward-osmosis organic-inorganic composite membranes are prone to microbial pollution in water treatment environments is overcome, the service life of the forward-osmosis membrane is prolonged, and the membrane is a new forward-osmosis organic-inorganic composite membrane with the wide application potential.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a forward osmosis organic-inorganic composite membrane and a preparation method thereof. Background technique [0002] The membrane separation process is a highly efficient and energy-saving water treatment process. The water treatment membrane is the core of the membrane water treatment process, and its performance determines whether the membrane water treatment process can be applied on a large scale. The forward osmosis membrane separation process is a new type of membrane separation technology developed in recent years. Compared with the traditional pressure-driven membrane process, the forward osmosis process does not require external pressure, consumes less energy, and has less pollution to the membrane. Low, the recovery rate of the process is high, and the environmental effect is friendly. The forward osmosis membrane is the core of the forward osmosis proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00C02F1/44
Inventor 刘义平
Owner NINGBO LIANHUA ENVIRONMENTAL SCI & TECH
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