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Composite fine particles of forward osmosis driving solution system and application thereof

A driving solution and forward osmosis technology, applied in the direction of osmosis/dialysis water/sewage treatment, etc., can solve the problems of low osmotic pressure, low water permeation efficiency, poor long-term stability, etc.

Inactive Publication Date: 2010-11-24
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this drive solution system are obvious: low osmotic pressure, low water penetration efficiency; protein shell is not resistant to acid and alkali and temperature changes, and the aging speed is fast, so the long-term stability of this type of particles is poor; protein is easy to become Bacteria and other microorganisms are attacked and become a source of secondary biological pollution; the cost of ferritin-coated magnetic particles is too high

Method used

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  • Composite fine particles of forward osmosis driving solution system and application thereof
  • Composite fine particles of forward osmosis driving solution system and application thereof
  • Composite fine particles of forward osmosis driving solution system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Sulfonated polystyrene beads (SPS) drive solution: Add 200 g of deionized water into a three-necked flask, then mechanically stir and raise the temperature of the water bath to 85°C. Add 20g of sodium p-styrene sulfonate into a three-necked flask, stir and mix evenly. Weigh 0.1 g of ammonium persulfate and dissolve it in 10 g of deionized water, and then add it into the above-mentioned three-necked flask. Condensed and refluxed for 24h. Sulfonated polystyrene (SPS) is obtained. Water-soluble sulfonated polystyrene microspheres (SPSS, diameter range 10-20 microns) were obtained after centrifugation. Get 15 grams of SPSS, dissolve it in 85 grams of water and prepare a drive solution containing fine particles, use a CA membrane (cellulose acetate membrane material) as a permeable membrane, and after 18 hours, the permeability of the membrane measured is 15kg / m 2 h. Solvent systems include water, methanol, ethanol, propanol, butanol, pentanol, ethylene glycol, glycerol,...

Embodiment 2

[0062] Carboxylated polystyrene microsphere drive solution

[0063] Add 90 g of deionized water into the three-necked flask, then mechanically stir and raise the temperature of the water bath to 85°C. Add 3g of acrylic acid and 10g of styrene into a three-necked flask, stir and mix evenly. Weigh 0.1 g of ammonium persulfate and dissolve it in 10 g of deionized water, and then add it into the above-mentioned three-necked flask. Condensed and refluxed for 24h. A carboxylated polystyrene emulsion is obtained. Titration with sodium hydroxide and centrifugation gave the sodium salt of water-soluble carboxylated polystyrene microspheres (PSA). Particle size analysis determined a sphere size of 150 nm. Weigh 10 grams of dry PSA sodium salt and dissolve it in 90 grams of water to be used as the drive solution for forward osmosis. Using the CA membrane as the permeable membrane, the permeability of the membrane was measured to be 10kg / m in 18 hours 2 h. The fine particles are rec...

Embodiment 3

[0065] Fe3O4 or Fe2O3 fine pellets

[0066] FeCl 2 and FeCl 3 The molar ratio is 1:2 as the raw material, dissolved in deionized water, adding PEG-400, when heated to 60 degrees, adding NaOH solution while electric stirring, and reacting for 30 minutes to obtain fine ferric iron tetroxide with a particle size of 9 nanometers fine particles. The reaction solution was taken out and washed once with deionized water, magnetically sucked to remove impurities, and modified with aminopropyltriethoxysilane (APTES) to obtain amino-modified SPION. The nanoparticles are further reacted with methyl bromide to obtain quaternized ammonium salts. The material is repeatedly deposited with anionic sulfonated macromolecule and cationic polymer polyallylamine hydrochloride to obtain stable polyelectrolyte-wrapped superparamagnetic fine particles (with a diameter range of 30-100 nanometers). 10 grams of superparamagnetic fine particles are dissolved in 90 grams of water. Using CA membrane as...

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Abstract

The invention relates to composite fine particles of a forward osmosis driving solution system. Fine particle cores are fully or partially coated by a separable outer layer; an outer layer shell provides an osmotic pressure; and the cores provide a separable characteristic. The solution system has the characteristics that: (1) the system has the composite fine particles having core-shell structures; (2) the diameters of the composite fine particles are less than 500 microns; and (3) the cores of the fine particles comprise particle cores of polymer particles, chitosan, nonmetal particles, metal or alloy; the shells of the fine particles comprise sodium polystyrene sulfonate, polyvinylamine hydrochloride, polyacrylic acid sodium salt, sylvite, calcium salt, polymethylacrylic acid sodium salt or sylvite, polyvinyl alcohol or polyaniline hydrochloride; the surfaces of the fine particle shells are provided with grafted groups, namely, chemical substances having ionization performance are grated on the surfaces of the particle shells by a chemical method; chemical structures having ionization performance are selected from the following chemical substances: Cl<->, COO<-> or SO<3->; and corresponding counter ions are H<+>, Na<+>, K<+>, Ca<2+> or quaternary ammonium salt according to the properties of the groups.

Description

technical field [0001] The invention discloses a forward osmotic high osmotic pressure drive solution system based on novel fine particles and its application. technical background [0002] Water, energy and environmental crises have become global issues. The development of the economy has increased the demand for clean water sources, and the discharge of waste water has caused damage to the environment; with the increasing dependence of human beings on conventional oil energy, the continuous reduction of oil reserves and the large fluctuations in oil prices in the market have caused the instability of economic development. Sustainability has gradually become the mainstream of social and economic development. From a technical point of view, the development direction of technologies for solving water resources and environmental crises must also be sustainable green technologies. Only in this way, when solving the water crisis, will not cause new environmental pollution. ...

Claims

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Application Information

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IPC IPC(8): C02F1/44
Inventor 何涛李雪梅柳越许高杰马宇春李广录刘安康陆秋萍
Owner NANJING UNIV OF TECH
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