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Chitosan/polyvinyl alcohol/ferroferric oxide composite magnetic particle as well as preparation and application thereof

A technology of composite magnetic particles and ferroferric oxide, which is applied in the fields of alkali metal compounds, water/sludge/sewage treatment, alkali metal oxides/hydroxides, etc., which can solve the problems of high consumption, high cost, and limited application range, etc. problems, to achieve the effect of high utilization rate of raw materials, simplified steps, and controllable particle size

Inactive Publication Date: 2014-09-03
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to use a certain amount of paraffin as the oil phase, a certain dose of surfactant to disperse and emulsify and a certain dose of crosslinking agent to increase the mechanical strength; this method requires long-term high-speed mechanical stirring and consumes a lot of water for washing product, higher cost
In addition, the particle size obtained by this method is mostly below 200 μm, and the application range is limited.

Method used

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  • Chitosan/polyvinyl alcohol/ferroferric oxide composite magnetic particle as well as preparation and application thereof
  • Chitosan/polyvinyl alcohol/ferroferric oxide composite magnetic particle as well as preparation and application thereof
  • Chitosan/polyvinyl alcohol/ferroferric oxide composite magnetic particle as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 2.0g of chitosan powder and dissolve it in 40mL of distilled water, add dropwise acetic acid to adjust the pH of the solution to 5-6, stir and dissolve at room temperature; weigh 7.5g of polyvinyl alcohol powder and dissolve it in 100mL of distilled water at 80°C for 50 minutes, and cool to room temperature; mix the chitosan solution and the polyvinyl alcohol solution, and mechanically stir evenly; at the same time, weigh 0.5g ferric oxide powder and add it to the above blend solution, and disperse ultrasonically for 10 minutes to make the ferric oxide disperse evenly; into 100mL1mol / L NaOH solution, the droplets solidified into spherical particles immediately, and stood for 5 minutes; transferred the spherical particles to distilled water for soaking and washing twice, and then transferred to absolute ethanol solution to swell for 30 minutes; after taking them out, dry them naturally, Chitosan / polyvinyl alcohol / ferric oxide ternary composite magnetic particles can...

Embodiment 2

[0039] Weigh 5.0g of chitosan powder and dissolve in 100mL of distilled water, add dropwise acetic acid to adjust the pH value of the solution to 5-6, stir and dissolve at room temperature; weigh 5.0g of polyvinyl alcohol powder and dissolve it in 100mL of distilled water at 75°C for 40 minutes, and cool to room temperature; mix the chitosan solution and the polyvinyl alcohol solution, and mechanically stir evenly; simultaneously weigh 1.2g of Fe3O4 powder and add it to the blend solution, and ultrasonically disperse for 10min to make the Fe3O4 disperse evenly; into 100mL1mol / L NaOH solution, the droplets solidified into spherical particles immediately, and stood for 10 minutes; transferred the spherical particles to distilled water for soaking and washing twice, and then transferred to absolute ethanol solution to swell for 30 minutes; after taking them out, dry them naturally, Chitosan / polyvinyl alcohol / ferric oxide ternary composite magnetic particles can be obtained.

[00...

Embodiment 3

[0042] Weigh 6.0g of chitosan powder and dissolve it in 110mL of distilled water, add dropwise acetic acid to adjust the pH of the solution to 5-6, stir and dissolve at room temperature; weigh 2.5g of polyvinyl alcohol powder and dissolve it in 30mL of distilled water at 70°C for 20 minutes, and cool to room temperature; mix the chitosan solution and the polyvinyl alcohol solution, and mechanically stir evenly; at the same time, weigh 1.4g ferric oxide powder and add it to the blend solution, and ultrasonically disperse it for 10 minutes to disperse the ferric oxide uniformly; Put it into 100mL1mol / L NaOH solution, the droplets solidify into spherical particles immediately, let stand for 20min; Polysaccharide / polyvinyl alcohol / ferric oxide ternary composite magnetic particles.

[0043] The resulting particles were then observed with a scanning electron microscope (see Figure 5 ).

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Abstract

The invention discloses a chitosan / polyvinyl alcohol / ferroferric oxide composite magnetic particle as well as preparation and application thereof, and relates to a composite magnetic particle, which is formed by the following components in percentage by mass: 20-80% of chitosan, 10-75% of polyvinyl alcohol and the balance of ferroferric oxide. The particle diameter is 500-4000 micrometers and is controllable. The preparation method comprises the following steps: mixing a chitosan acid solution with a polyvinyl alcohol water solution; adding ferroferric oxide powder; dispersing ferroferric oxide powder in the mixed liquid to obtain a mixed liquid; adding a NaOH solution into the mixed solution; curing to ball-shaped particles; collecting the obtained ball-shaped particles through an outside magnetic field and adding the particles into ethanol; swelling and standing; soaking and washing, and drying to obtain the chitosan / polyvinyl alcohol / ferroferric oxide composite magnetic particle. As shown in experiment, the chitosan / polyvinyl alcohol / ferroferric oxide composite magnetic particle can be used in preparation of agents for removing heavy metal in water.

Description

technical field [0001] The invention relates to a composite magnetic particle, in particular to a chitosan / polyvinyl alcohol / ferric iron tetroxide ternary composite magnetic particle which can be used for removing heavy metals in water, and a preparation method and application thereof. Background technique [0002] With the development of industries such as metallurgy, industrial mining, and electroplating, the frequency of heavy metal pollution incidents in water has gradually increased, such as the gold blood lead incident in Zizi, Guangdong, and the chromium pollution in Qujing, Yunnan. According to statistics, the current proportion of China's urban water sources that are truly qualified is about 50%. [0003] At present, the main treatment methods include chemical deposition, electrolysis, biological treatment, adsorption and other methods. Among them, the adsorption method is a method with simpler operation, lower cost and wider application. [0004] Both chitosan an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 叶李艺罗智明张敬苗吐松
Owner XIAMEN UNIV
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