Preparing method for starch-modified heavy metal trapping agent

A technology of heavy metal trapping agent and starch, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of low amino content and low copper removal rate, so as to increase amino content, Effect of improving copper removal rate

Active Publication Date: 2016-09-07
JIAXING UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] Although cross-linked amino-modified starch has been studied for a long time, in the traditional preparation process, the alkaline environment of its amination reaction is directly provided by the aminating agent. The modified starch prepared by this preparation method has low amino content and copper removal. Disadvantages such as low rate

Method used

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  • Preparing method for starch-modified heavy metal trapping agent
  • Preparing method for starch-modified heavy metal trapping agent
  • Preparing method for starch-modified heavy metal trapping agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] (1) dissolving cornstarch in a mass fraction of 1% sodium chloride aqueous solution, the mass ratio of cornstarch to sodium chloride aqueous solution is 1:1.5, adding catalyst sodium hydroxide, the mass ratio of catalyst and cornstarch is 1:75 , heated to 25°C, slowly drop epichlorohydrin, the mass ratio of epichlorohydrin and corn starch is 1:40, keep the constant temperature water bath, continue to react for 18 hours, then stop the reaction. Neutralize to about pH=6 with 2% hydrochloric acid, perform vacuum filtration, wash with water, and vacuum-dry for 3 hours. The sedimentation volume of the obtained cross-linked starch is 31 mL, and the water content is 11%.

[0081] (2) Add cross-linked starch, with epichlorohydrin as etherification agent, the mass ratio of etherification agent to cross-linked starch (in percent, the same below) is 85:100, and the mass fraction is 60% of high chlorine Acid (aqueous solution) was used as the initiator, and the mass ratio of the in...

Embodiment 2

[0092](1) dissolving cornstarch in a mass fraction of 1% sodium chloride aqueous solution, the mass ratio of cornstarch to sodium chloride aqueous solution is 1:1.5, adding catalyst sodium hydroxide, the mass ratio of catalyst and cornstarch is 1:75 , heated to 25°C, slowly dropwise adding epichlorohydrin, the mass ratio of epichlorohydrin to corn starch is 1:40, in a constant temperature water bath, continue to react for 14 hours, then stop the reaction. Neutralize with 2% hydrochloric acid to about pH=6, carry out vacuum filtration, wash with water, and vacuum dry for 3 hours. The sedimentation volume of the obtained cross-linked starch is 33mL, and the water content is 11%.

[0093] (2) add cross-linked starch, take epichlorohydrin as etherification agent, the mass ratio of etherification agent and cross-linked starch is 85:100, and be 60% perchloric acid (aqueous solution) as initiator with mass fraction, The mass ratio of initiator and cross-linked starch was 0.74:100, an...

Embodiment 3

[0097] (1) dissolving cornstarch in a mass fraction of 1% sodium chloride aqueous solution, the mass ratio of cornstarch to sodium chloride aqueous solution is 1:1.5, adding catalyst sodium hydroxide, the mass ratio of catalyst and cornstarch is 1:75 , heated to 25°C, slowly dropwise adding epichlorohydrin, the mass ratio of epichlorohydrin to corn starch is 1:40, in a constant temperature water bath, continue to react for 8 hours, then stop the reaction. Neutralize to about pH=6 with 2% hydrochloric acid, perform vacuum filtration, wash with water, and vacuum-dry for 3 hours. The sedimentation volume of the obtained cross-linked starch is 41 mL, and the water content is 11%.

[0098] (2) add cross-linked starch, take epichlorohydrin as etherification agent, the mass ratio of etherification agent and cross-linked starch is 85:100, and be 60% perchloric acid (aqueous solution) as initiator with mass fraction, The mass ratio of initiator and cross-linked starch was 0.65:100, and...

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Abstract

The invention discloses a starch-modified heavy metal trapping agent and a preparing method thereof. The preparing method comprises the steps that firstly, starch is taken and subjected to a cross-linking reaction with a cross-linking agent under the action of a catalyst, and cross-linked starch is obtained; secondly, the cross-linked starch and an etherifying agent are subjected to an etherification reaction under the action of an initiator, and cross-linked etherified starch is obtained; thirdly, in an alkaline environment of a sodium carbonate aqueous solution, the cross-linked etherified starch and an aminating agent are subjected to an amination reaction, and the obtained cross-linked amino starch is the starch-modified heavy metal trapping agent, wherein the content of amino in the modified starch is 1.2-1.8%. Compared with the prior art, the sodium carbonate aqueous solution is used for providing the alkaline environment in the amination reaction, the content of amino of the modified starch can be increased through the preparing method, the starch-modified heavy metal trapping agent has the advantage of being high in copper removing rate, and a chelate formed by the starch-modified heavy metal trapping agent and heavy metal ions is insoluble in water, and can be easily separated from a solution.

Description

technical field [0001] The invention belongs to the field of environmental protection material preparations, in particular to a preparation method of modified starch used as a heavy metal trapping agent. Background technique [0002] At present, there are mainly three types of methods for treating heavy metal wastewater: the first type is to remove heavy metal ions in wastewater through chemical reactions; the second type is to perform adsorption, solvent extraction, ion exchange, etc. The purpose of heavy metals in wastewater; the third category is to remove heavy metals in wastewater by means of flocculation, absorption, accumulation, and enrichment of microorganisms or plants. [0003] Polymer heavy metal scavenger method Because the polymer heavy metal scavenger can combine heavy metal ions in the range of room temperature and temperature and pH value, a stable and insoluble metal chelate is formed, with high reaction efficiency and good selectivity , and when treating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12C02F1/28B01J20/24B01J20/30C02F101/20
CPCB01J20/24B01J2220/4825C02F1/286C02F2101/20C08B31/12
Inventor 谭军韦晓燕欧阳玉霞
Owner JIAXING UNIV
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