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Process for polyvinyl alcohol embedding preparation of spherical bentonite

A technology of polyvinyl alcohol and bentonite, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as difficult separation, and achieve the effect of easy-to-obtain raw materials and abundant resources

Inactive Publication Date: 2006-12-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problem of difficult solid-liquid separation after organic bentonite adsorbs and treats pollutants in water, and improves the removal rate of heavy metals while maintaining the high removal rate of organic matter by organic bentonite

Method used

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  • Process for polyvinyl alcohol embedding preparation of spherical bentonite
  • Process for polyvinyl alcohol embedding preparation of spherical bentonite
  • Process for polyvinyl alcohol embedding preparation of spherical bentonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Dissolve cetylpyridinium bromide in an amount equal to 50% of the cation exchange capacity of bentonite in water, add 100 mesh natural sodium bentonite, stir at 20°C for 1.5h, wash, filter, and dry at 90 Activation at ℃ for 30 minutes, grinding through a 100-mesh sieve to obtain organobentonite;

[0033] (2) Mix the above organic bentonite with a mass volume ratio of 8:50 and 10% polyvinyl alcohol solution containing 0.02% sodium alginate, the degree of polymerization of the polyvinyl alcohol used is 1750±50, and the degree of alcoholysis is 98-99% , stirred for 30 minutes to make it evenly mixed;

[0034] (3) Add the above mixture dropwise to the cross-linking agent with a separatory funnel with a pipette tip to carry out the cross-linking reaction, the cross-linking agent is a saturated boric acid solution containing 2% calcium chloride, and 2 CO 3 Adjust the pH of the solution to 6.5, add dropwise while stirring, rinse with distilled water after the crosslinkin...

Embodiment 2

[0036] (1) Dissolve tetradecylpyridinium bromide in an amount equal to 200% of the cation exchange capacity of bentonite in water, add 200 mesh natural sodium-based bentonite, stir at 30°C for 4 hours, wash, filter, and dry at 110°C Activation at high temperature for 60 minutes, grinding through a 100-mesh sieve to obtain organobentonite;

[0037] (2) Mix the above organobentonite with a mass volume ratio of 9:50 and 10% polyvinyl alcohol solution containing 0.2% sodium alginate, the degree of polymerization of the polyvinyl alcohol used is 1750±70, and the degree of alcoholysis is 99-100% , stirred for 90min to make it evenly mixed;

[0038] (3) Add the above mixture dropwise to the cross-linking agent with a separatory funnel with a pipette tip to carry out the cross-linking reaction, the cross-linking agent is a saturated boric acid solution containing 2% calcium chloride, and 2 CO 3 Adjust the pH of the solution to 6.7, add dropwise while stirring, rinse with distilled w...

Embodiment 3

[0040] (1) Dissolve tetradecylpyridinium chloride with an amount of 60% of the cation exchange capacity of bentonite in water, add 100 mesh natural sodium bentonite, stir at 30°C for 2 hours, wash, filter, and dry at 95°C Activation at high temperature for 45 minutes, grinding through a 100-mesh sieve to obtain organobentonite;

[0041] (2) Mix the above organic bentonite with a mass volume ratio of 7:50 and 10% polyvinyl alcohol solution containing 0.16% sodium alginate, the degree of polymerization of the polyvinyl alcohol used is 1750±50, and the degree of alcoholysis is 99.8 to 100% , stirred for 60 minutes to make it evenly mixed;

[0042] (3) Add the above mixture dropwise to the cross-linking agent with a separatory funnel with a pipette tip to carry out the cross-linking reaction, the cross-linking agent is a saturated boric acid solution containing 2% calcium chloride, and 2 CO 3 Adjust the pH of the solution to 6.3, add dropwise while stirring, rinse with distilled...

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Abstract

The invention discloses a preparation method of polyvinyl alcohol embedded spherical alta-mud, which characterized in the steps: (1) dissolving the quaternary ammonium salt cationic surface active agent into water, adding natural alta-mud, stirring, scrubbing, filtering, drying, activating, grinding by 100 mesh sieve and obtaining organobentonite; (2) mixing the said organobentonite and polyvinyl alcohol solution of 10 % containing sodium alginate of 0.02-0.2 % and stirring; (3) dripping the said mixture by separatory funnel with liquid-transfer head to crosslinking agent, after crosslinking reaction, rinsing with distilled water and drying. The excellence of the invention is: not needing filtration, centrifugation or sedimentation after adsorbing contaminant in water; having equivalent effect of removing organics to powder state alta-mud, having better effect of removing heavy metal than powder state alta-mud, capable of realizing simultaneously removing organic contaminant and heavy metal in waste-water, and capable of repetitious using after simple processing.

Description

technical field [0001] The invention relates to novel material synthesis, in particular to a method for preparing spherical bentonite by embedding polyvinyl alcohol. Background technique [0002] The annual discharge of sewage in my country is nearly 50 billion tons, most of which are directly discharged into rivers, lakes and seas without treatment, seriously threatening people's lives. One of the main reasons for serious water pollution is the lack of economical and efficient wastewater treatment practical technologies and new materials, and environmental pollution control and restoration is one of the problems that must be solved in the field of environmental science and engineering at home and abroad. Therefore, it is necessary to find an efficient , Economical and simple wastewater treatment methods are particularly important. Bentonite is a kind of clay rock with Montmorillonite as the main component. It is rich in resources in my country, ranking first in the world, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/26B01J20/30
Inventor 沈学优孙晓慧卢瑛莹
Owner ZHEJIANG UNIV
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