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Nano magnetic iron oxide/kaolin particle as well as preparation method and use thereof

A nano-magnetic iron oxide and kaolin technology, applied in the field of water treatment, can solve the problems of easy agglomeration of nanoparticles and arsenic pollution, etc., and achieve the effect of large adsorption capacity, large specific surface area, and good solid-liquid separation effect

Inactive Publication Date: 2014-04-16
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to overcome the magnetic Fe in the prior art 3 o 4 The defect that nanoparticles are prone to agglomeration is provided. A nano-magnetic iron oxide / kaolin particle and its preparation method and application are provided. The source of raw materials for preparing this nano-magnetic iron oxide / kaolin particle is abundant, the preparation method of the particle is simple, and the effect of removing arsenic is good. It can effectively solve the problem of serious arsenic pollution in the existing water body

Method used

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  • Nano magnetic iron oxide/kaolin particle as well as preparation method and use thereof
  • Nano magnetic iron oxide/kaolin particle as well as preparation method and use thereof

Examples

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Effect test

Embodiment 1

[0018] Preparation of nano-magnetic iron oxide / kaolin particles: fully crush the kaolin and pass through a 500-mesh sieve, wash the 500-mesh kaolin with 1M hydrochloric acid, wash with deionized water for 3-5 times, and dry at 105°C for later use. Weigh 20 grams of polyvinylpyrrolidone (PVP) and fully dissolve it in 400 mL of deionized water. After about 0.5-1 hour, place it in a 90°C water bath, weigh 2 grams of dried kaolin, add it to the PVP solution, and wash with 4M NaOH Adjust the pH value of the system to 10, under constant stirring, add and dissolve 13.9 grams of FeSO 4 ·7H 2 O solution 100ml, and then under vigorous stirring, drop by drop to dissolve 24.4 grams of FeCl 3 ·6H 2 The solution of O was 100ml, and a brownish-black precipitate was produced. At the same time, the pH of the system was constantly adjusted with 4M NaOH to keep it at about 10. Continue to stir in the water bath for 1 hour, then leave to age in the water bath for 12 hours. After removing the ...

Embodiment 2

[0021] Preparation of nano-magnetic iron oxide / kaolin: 500-mesh kaolin was washed with hydrochloric acid, dried at 105°C and set aside. Weigh 25 grams of PVP and fully dissolve it in 500 mL of deionized water. After about 0.5-1 hour, place it in a 70°C water bath, weigh 2.5 grams of dried kaolin, add it to the above solution, and adjust the pH value to 8 with 5M NaOH. , stirring vigorously, was added dissolved with 14.9 g of FeCl 2 4H 2 O solution 100ml, and then under vigorous stirring, drop by drop to dissolve 36.5 grams of FeCl 3 ·6H 2 The solution of O was 100ml, and a brown-black precipitate was produced. At the same time, the pH of the system was constantly adjusted with 5M NaOH to keep it at about 8. Continue to stir in the water bath for 1 hour, then leave to age in the water bath for 8 hours. After removing the supernatant, add deionized water and ethanol to fully wash 5 times until the salt and water-soluble substances are removed, filter with a funnel, dry the r...

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Abstract

The invention relates to a nano magnetic iron oxide / kaolin particle as well as a preparation method and use thereof. The particle is of a core-shell structure with an inner core and a shell, wherein the inner core is kaolin mineral; the shell is nano magnetic iron oxide; the ingredient of the nano magnetic iron oxide is Fe3O4; the nano magnetic iron oxide particle is 10-80nm in particle size. The nano magnetic iron oxide / kaolin particle is prepared by virtue of the following steps: bathing the fully dissolved polyvinylpyrrolidone solution; adding kaolin, adding an alkali liquor to adjust the pH value of the system after fully mixing, and then adding a ferrous salt solution; dropwise dripping a ferric salt solution under strong agitation, so that a dark brown sediment is generated; simultaneously, continuously adding the alkali liquor to keep the pH value of the system at 8-10; fully washing and filtering after bathing and ageing; drying and baking the sediment in vacuum; cooling and then grinding, so as to obtain the particles. The particles can be used for in-situ remediation of arsenic in high-arsenic groundwater. The particles are strong in adsorption capacity, simple in preparation, cheap and available in raw material, and easy to popularize and use, and the pollutants such as arsenic in the water can be efficiently removed.

Description

technical field [0001] The invention relates to a nanometer magnetic iron oxide / kaolin particle, a preparation method and application thereof, and belongs to the technical field of water treatment. Background technique [0002] Arsenic and arsenic compounds are carcinogens recognized by many authoritative organizations under the World Health Organization (WHO). Due to human production and living activities, such as mining, smelting, irrigation, and application of arsenic-containing pesticides, arsenic compounds in the stratum enter surface water and groundwater along with rainfall, surface runoff, and groundwater infiltration. A large amount of salts and other forms are dissolved into water intake, especially activities such as digging wells for drinking water, and affected by the climate and ecological environment of various regions, some of the surface water enters the groundwater, which has brought serious arsenic pollution problems in water bodies. [0003] Arsenate and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 孔淑琼周辰昕王焰新
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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