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Preparation method of hydrophilic polyving akohol nanometer microsphere resisting biological contamination

A technology of anti-biological pollution and polyvinyl alcohol, which is applied in biological water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of membrane module pollution and high price of membrane modules, and reduce operation Cost, strong operability, and good shape

Inactive Publication Date: 2010-08-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the widespread problems of serious pollution of membrane modules and high price of membrane modules, nano-microspheres can be used as a precoating agent for membrane modules in membrane bioreactors in sewage treatment processes to improve membrane fouling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The concentration of emulsifier Span 80 is 14%, the concentration of OP-10 is 6%, and the inner water phase is 5 mL of polyvinyl alcohol aqueous solution with a mass fraction of 2.5% (w / v). During preparation, the inner water phase is placed in a stirring vessel It was emulsified in 100 g of external oil phase system under medium-speed stirring (150 rpm) to form a transparent and homogeneous microemulsion. 1.174 mL of glutaraldehyde / ether solution was added dropwise to the microemulsion under the condition that the theoretical crosslinking degree was 80%, and then the microemulsion was placed in a magnetically stirred water bath at 50° C. for 3 hours for crosslinking reaction. After the reaction is completed, ethanol is destabilized, centrifuged, washed with isopropanol, absolute ethanol and water, and dried in vacuum to prepare spherical microspheres with an average particle diameter of 490 nm.

Embodiment 2

[0021] The concentration of emulsifier Span 80 is 12%, the concentration of OP-10 is 8%, and the inner water phase is 5 mL of polyvinyl alcohol aqueous solution with a mass fraction of 2.5% (w / v). During preparation, the inner water phase is placed in a stirring vessel It was emulsified in 100 g of external oil phase system under medium-speed stirring (150 rpm) to form a transparent and homogeneous microemulsion. 1.027 mL of glutaraldehyde / ether solution was added dropwise to the microemulsion under the condition that the theoretical crosslinking degree was 70%, and then the microemulsion was placed in a magnetically stirred water bath at 50° C. for 3 hours for crosslinking reaction. After the reaction is completed, ethanol is destabilized, centrifuged, washed with isopropanol, absolute ethanol and water, and dried in vacuum to prepare spherical microspheres with an average particle diameter of 228 nm.

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Abstract

The invention discloses a preparation method of hydrophilic polyving akohol nanometer microsphere resisting biological contamination, belonging to the technical field of environmental contamination control engineering. The invention is characterized by adopting a reverse micro-emulsion polymerization method and utilizes aldolization to carry out crosslinking on the nanometer microspheres. An internal aqueous phase is polyving akohol aqueous solution, oil phase is liquid paraffin, and emulsifier is compounded by Span 80 and OP-10. In the preparation process, the aqueous phase is added into external oil phase to form transparent and homogeneous microemulsion; then, cross-linking agent is added into the microemulsion; finally, the mixture is put into a water bath kettle at the temperature of 50 DEG C to react for 3 hours; after the reaction ends, ethanol is destabilized and centrifugalized, is washed by isopropanol, absolute ethyl alcohol and water, and is dried in vacuum. The invention has the effect and benefit that nanometer microspheres with different grain diameters are prepared by changing emulsifier content and theoretical degree of cross linking so as to satisfy different requirements. The surface of the microsphere has a great quantity of hydroxide radical, so that the microsphere has higher hydrophily and electronegativity; when applied in environmental fields, the microsphere has strong biological contamination resisting capability.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control engineering and relates to a method for preparing polyvinyl alcohol nano-microspheres which are hydrophilic and anti-biological pollution. Background technique [0002] With the development of social economy and the growth of population, the shortage of water resources has become a global problem, and the situation of water shortage in our country is even more severe. Due to the increasingly serious water pollution, the water environment is undergoing "qualitative" changes, which has brought many adverse effects to human production and life. About 500 billion tons of sewage are discharged on the earth every year, 90% of which have not been treated. Water pollution is most serious in developing countries. [0003] In recent years, a variety of new and efficient sewage treatment technologies have emerged, among which membrane bioreactor (Membrane Bioreactor, MBR) is an emer...

Claims

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Application Information

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IPC IPC(8): C02F3/00
Inventor 张捍民李宏艳段金莉崔霞
Owner DALIAN UNIV OF TECH
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