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Polystyrene nano zero-valent iron composite material and preparation method and application thereof

A polystyrene nano-composite material technology, applied in chemical instruments and methods, alkali metal compounds, other chemical processes, etc., can solve the problems of easy agglomeration and deactivation, poor stability, difficult separation, etc., and achieve large adsorption capacity and stability. Good sex, not easy to agglomerate

Inactive Publication Date: 2019-04-16
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem to be solved: In view of the existing problems of nano-iron in the prior art, such as small particle size, poor stability, easy agglomeration and deactivation, and difficulty in separating from water, the present invention provides a polystyrene nano-zero-valent iron composite material and its preparation method and application, the prepared polystyrene nano-zero-valent iron composite material has good stability, strong activity, strong separability in water, high catalytic degradation performance for water pollutants, high mechanical strength and environmental friendliness, etc. features

Method used

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  • Polystyrene nano zero-valent iron composite material and preparation method and application thereof
  • Polystyrene nano zero-valent iron composite material and preparation method and application thereof
  • Polystyrene nano zero-valent iron composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Dissolve polystyrene in N,N-dimethylformamide at a mass ratio of 1:4 to obtain a polystyrene solution with a mass concentration of 20%, and add methanol 10 times that of N,N-dimethylformamide Under liquid nitrogen freezing conditions, freeze into a solid, place in liquid nitrogen that is twice as large as the solution, wait until the system is stable and the boiling degree of liquid nitrogen slows down, slowly drop 20 wt.% polystyrene solution into the solution containing solid methanol through a peristaltic pump Polystyrene microspheres were obtained in liquid nitrogen to prevent droplet aggregation. Let the system stand still, the liquid nitrogen slowly volatilizes, and the methanol slowly melts with the increase of the system temperature to replace the N,N-dimethylformamide in the polystyrene. The obtained microspheres are washed in methanol for 2-3 times, and then put into a vacuum oven to dry at room temperature.

[0039] Dissolve ferrous chloride in water at a ma...

Embodiment 2

[0044] Dissolve polystyrene in toluene at a mass ratio of 1:1 to obtain a polystyrene solution with a mass concentration of 50%. Freeze methanol 20 times that of toluene into a solid under liquid nitrogen freezing conditions and place it in three times the solution When the system is stable and the boiling degree of liquid nitrogen slows down, 50 wt.% polystyrene solution is slowly dropped into liquid nitrogen containing solid methanol through a peristaltic pump to obtain polystyrene microspheres to prevent droplet polymerization. Let the system stand still, the liquid nitrogen slowly volatilizes, and the methanol melts slowly with the increase of the system temperature, displacing the toluene in the polystyrene. The obtained microspheres are washed in methanol for 2-3 times, and then put into a vacuum oven to dry at room temperature.

[0045] Dissolve ferrous sulfate in water at a mass ratio of 1:7, immerse the microspheres obtained above in a methanol solution of ferrous sul...

Embodiment 3

[0050] Dissolve polystyrene in carbon tetrachloride at a mass ratio of 1:3 to obtain a polystyrene solution with a mass concentration of 25%, and freeze methanol 15 times that of carbon tetrachloride into a solid under liquid nitrogen freezing conditions , placed in liquid nitrogen five times that of the solution, and when the system was stable and the boiling degree of liquid nitrogen slowed down, 25 wt.% polystyrene solution was slowly dropped into liquid nitrogen containing solid methanol through a peristaltic pump to obtain polystyrene microspheres , to prevent droplet aggregation. Let the system stand still, the liquid nitrogen volatilizes slowly, and the methanol melts slowly with the increase of the system temperature, displacing the carbon tetrachloride in the polystyrene. The obtained microspheres are washed in methanol for 2-3 times, and then put into a vacuum oven to dry at room temperature.

[0051] Dissolve ferrous nitrate in water at a mass ratio of 1:10, immers...

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Abstract

The invention discloses a polystyrene nano zero-valent iron composite material and a preparation method and application thereof and belongs to the field of organic macromolecular material synthesis. According to the composite material, a liquid-phase reduction method is adopted, nano zero-valent iron is loaded into porous polystyrene pellets obtained by means of a flash freezing method, polystyrene is firstly dissolved in a certain quantity of an organic solvent to obtain a polystyrene solution, and then the polystyrene solution is dropwise added into liquid nitrogen containing another solid organic solvent; liquid nitrogen slowly volatilizes, the solvent slowly melts along with the temperature rise of a system, an organic solvent in original polystyrene is replaced to obtain the porous polystyrene pellets, and the porous polystyrene pellets are soaked in a high-concentration iron-containing solution and then taken out to be soaked in a methanol solution of sodium borohydride; by repeating the operation above several times, the polystyrene nano zero-valent iron composite material is obtained. The material prepared by the method has the advantages of high stability and activity, great separation capacity in water, excellent catalytic degradation performance on water pollutants, high in mechanical strength, environmentally friendly and the like.

Description

technical field [0001] The invention belongs to the field of synthesis of organic macromolecular materials, and more specifically relates to a polystyrene nanometer zero-valent iron composite material and its preparation method and application. Background technique [0002] Because of its small particle diameter, large specific surface area and large surface energy, nano-zero-valent iron has high adsorption performance and high reduction activity. The reactivity and processing efficiency of zero-valent iron particles can be improved by utilizing the unique surface effect and small size effect of nanoparticles. However, due to the lack of adjacent coordinated atoms on the surface, the nanoparticles themselves have high activity, so that there is nano interaction energy between the nanoparticles, resulting in agglomeration between the nanoparticles. In addition, due to the magnetism of nano-iron particles, the agglomeration phenomenon is more obvious, and the particles are ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/72B01J31/28C02F101/38C02F101/34
CPCB01J20/0229C02F1/288C02F1/722C02F1/725B01J20/261B01J20/28021B01J31/28C02F2101/345C02F2101/38B01J35/393B01J35/23B01J35/399
Inventor 杨朕杨维本陈嘉豪王旭增蒋欣
Owner NANJING NORMAL UNIVERSITY
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