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Mercapto-functionalized polyvinyl alcohol-gelatine composite crosslinked microsphere adsorbing agent and preparation thereof

A polyvinyl alcohol and microsphere adsorption technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., to achieve the effect of improving adsorption performance

Inactive Publication Date: 2008-11-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there are no public literature reports and patent applications on the thiol-functionalized polyvinyl alcohol-gelatin composite cross-linked microsphere adsorbent and its preparation method for mercury removal at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]Weigh 9.6g of gelatin and dissolve it in 118.4ml of deionized water to prepare a 7.5% (mass ratio) aqueous solution. Dissolve 9g of polyvinyl alcohol in 171ml of water to make a 5% (mass ratio) aqueous solution. Then above-mentioned two kinds of solutions are mixed together according to the mass ratio of gelatin:polyvinyl alcohol=1:0.6 and stir evenly. Then the pH of the above mixed aqueous solution was adjusted to 4 with 5% hydrochloric acid. Dissolve Tween-80 with a solution weight of 0.2% in 100 mL of liquid paraffin, then add the above-mentioned mixed aqueous solution (its volume is 1 / 2 of the organic phase) under stirring, heat up to 70° C. after stirring for about 0.5 h, and continue the reaction for 2 Hours, reduce the stirring speed, add 25% glutaraldehyde aqueous solution of 5% by weight of the solution, carry out the curing reaction and terminate the reaction after 4 hours. After post-processing such as filtration and washing, the polyvinyl alcohol-gelatin co...

Embodiment 2

[0032] Same as Example 1, but the consumption of thiochloropropane was changed from 20mL to 30mL, and the content of mercapto groups in the adsorbent was determined to be 6.05mmol / g by silver-back titration. According to the loss rate test, the loss rate of the thiol functionalized polyvinyl alcohol-gelatin composite cross-linked microsphere adsorbent is 0.8%. The static adsorption method detects that the adsorbent adsorbs 25mL of mercury nitrate with an initial concentration of 0.1g / L for 45 minutes, and the measured residual mercury ion concentration is 1.79mg / L, and its adsorption capacity is 4.91mgHg / g adsorbent , and the removal rates were 98.2%. Detected by the static adsorption method, the adsorbent adsorbed 25mL of mercury nitrate with an initial concentration of 20g / L for 45 minutes, and the measured residual mercury ion concentration was 225.4mg / L, and its adsorption capacity was respectively 988.7mgHg / g adsorbent, The removal rates were 98.9%, respectively.

Embodiment 3

[0034] Same as Example 1, but the consumption of thiochloropropane was changed from 20mL to 10mL, and the content of mercapto groups in the adsorbent was determined to be 1.88mmol / g by silver-back titration. According to the loss rate test, the loss rate of the thiol-functionalized polyvinyl alcohol-gelatin composite cross-linked microsphere adsorbent is 0.9%. Tested by static adsorption method, the adsorbent adsorbed 25mL of mercury nitrate with an initial concentration of 0.1g / L for 45 minutes, and the measured residual mercury ion concentration was 7.68mg / L, and its adsorption capacity was 4.62mgHg / g adsorbent , and the removal rates were 92.3%. Detected by the static adsorption method, the adsorbent adsorbed 25mL of mercury nitrate with an initial concentration of 20g / L for 45 minutes, and the measured residual mercury ion concentration was 485.2mg / L, and its adsorption capacity was 975.7mgHg / g adsorbent, respectively. The removal rates were 97.6%, respectively.

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Abstract

The invention pertains to the technical field of waste water processing, in particular to an adsorbent of thiol-group functionalized polyvinyl alcohol-gelatin compound cross-linking microspheres and a preparation method thereof. The adsorbent comprises that polyvinyl alcohol and gelatin are crossly clinked to form polymer microspheres, and then the keyed joint of a functional group, such as thiol-group is carried out. The adsorbent has adjustable composition and aperture, even size, large specific surface area, good high-concentration mercury ion adsorbing performance and trace amount of mercury ion adsorbing performance as well as good mechanical performance, and a damaged rate lower than 1.0 percent after being used for a plurality of times, thus being a new generation of mercury removing product with high performance and high efficiency and being able to be used in the waste water processing of heavy metal industry comprising mercury, lead, and cadmium, etc. with wider range of concentration. The method of the invention has simple technique, high production efficiency, high product quality and low cost, and is beneficial to mass production.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a mercapto-functionalized polyvinyl alcohol-gelatin composite cross-linked microsphere adsorbent and a preparation method thereof. Background technique [0002] Mercury is widely used in industrial fields such as papermaking, paint, cosmetics, preservatives, thermometers, pressure gauges, fluorescent lamps and batteries. At the same time, mercury will also bring a serious environmental pollution problem. Among all industrial heavy metal wastewater discharges, mercury is a pollutant that has the greatest impact on the environment. It is estimated that the newly increased mercury pollution from nature, man-made and ocean sprays is as high as 5,500 tons every year in the world. Therefore, the treatment of mercury-containing wastewater is directly related to human physical and mental health. How to efficiently deal with mercury has become an extremely import...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/62C02F1/28
Inventor 杨正龙浦鸿汀
Owner TONGJI UNIV
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