# US 8,540,883 B2 · Polymer composite, water-treatment method using the same and manufacturing method of the same

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- Number: US 8,540,883 B2
- Document ID: US8540883B2
- Status: Granted
- Kind: B2
- Application number: 13/524,160
- Filed: 2012-06-15
- Published: 2012-10-04
- Granted: 2013-09-24
- Earliest claimed: 2008-05-08
- Assignees: Kabushiki Kaisha Toshiba
- Applicants: Taro Fukaya; Shinetsu Fujieda; Shinji Murai; Akiko Suzuki; Hideyuki Tsuji; Tatsuoki Kohno; Nobuyuki Ashikaga
- Inventors: Taro Fukaya; Shinetsu Fujieda; Shinji Murai; Akiko Suzuki; Hideyuki Tsuji; Tatsuoki Kohno; Nobuyuki Ashikaga
- Web page: https://patentgrep.com/patent/US8540883B2

## CPC

- H01F 1/33: mixtures of metallic and non-metallic particles; metallic particles having oxide skin
- B82Y 25/00: Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance
- C02F 1/288: {using composite sorbents, e.g. coated, impregnated, multi-layered}
- C02F 1/48: with magnetic or electric fields (C02F1/46 takes precedence)
- C02F 1/285: {using synthetic organic sorbents}
- C02F 2303/16: Regeneration of sorbents, filters
- Y10T 428/249921: Web or sheet containing structurally defined element or component
- Y10T 428/2907: with coating or impregnation
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A polymer composite is provided for a water treatment. The polymer composite with excellent workability is capable of adsorbing impurities in water, being rapidly separated from the water using magnetic forces. The polymer composite includes secondary aggregates. The secondary aggregates are formed of clumped particles, the particles being magnetic particles covered with a polymer. The polymer composite has porous structures suitable for adsorbing underwater impurities.

## Claims

### Claim 1

A water-treatment method using a polymer composite, the polymer composite comprising:
secondary aggregates, the secondary aggregates being formed of clumped particles, the particles being magnetic particles covered with a polymer,
wherein a mean diameter of the magnetic particles is not less than 0.05 μm and not more than 100 μm,
the method comprising:
dispersing the polymer composite in water containing impurities;
making the polymer composite adsorb the impurities to surfaces of the polymer composite; and
separating the polymer composite adsorbed the impurities by using magnetic forces,
wherein C, D, X, E and F satisfy a relationship of 0.001≦F/(C×D×E)≦X, where
C (m2/g) represents a specific surface area of the magnetic particles;
D (%) represents a content rate of the magnetic particles to a whole weight of the polymer composite;
X (μm) represents a mean diameter of the magnetic particles;
E (g/cm3) presents density of the polymer; and
F (%) represents a content rate of the polymer to a whole weight of the polymer composite.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the water is industrial wastewater.

### Claim 3 (depends on 1)

The method according to claim 1, wherein a ratio Z/X of a mean diameter Z of the secondary aggregates to the mean diameter X of the magnetic particles is in a range from 10 to 10000.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the secondary aggregates are porous in structure.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the polymer is water-insoluble and soluble to one selected from methanol, ethanol, n-propanol, isopropanol, acetone, tetrahydrofuran, n-hexane, cyclohexane and mixtures thereof.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the polymer is one selected from polystyrene, hydrogenation polystyrene, polybutadiene, polyisoprene, polyacrylonitrile, polycycloolefin, polyvinyl pyridine, and polyvinyl-butyral and mixtures thereof.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the polymer is one selected from polystyrene, hydrogenation polystyrene, polybutadiene, polyisoprene, polyacrylonitrile, polycycloolefin, polyvinyl pyridine, and polyvinyl-butyral and mixtures thereof.

### Claim 8 (depends on 1)

The method according to claim 1, wherein used polymer is regenerated to be recycled for further water treatment by washing the used polymer composite with one selected from methanol, ethanol, n-propanol, isopropanol, acetone, tetrahydrofuran, n-hexane, cyclohexane and mixtures thereof.