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A polyaspartic acid bentonite composite material for removing heavy metal ions and its preparation method

A technology of polyaspartic acid and heavy metal ions, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as unsatisfactory water treatment effects, limited layer spacing, and single structure , to achieve the effect of improving the ability to effectively adsorb heavy metal ions, simple production equipment, and low cost

Active Publication Date: 2019-07-16
NINGBO ZHETIE JIANGNING CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, bentonite is a mineral clay rich in resources in my country. It has a unique layered structure and strong adsorption properties, and can remove heavy metal ions in water. However, due to its single structure and limited interlayer spacing, it is not effective enough for direct water treatment. Ideal, it needs to be modified to further improve its physical and chemical properties, so as to achieve the purpose of purifying water and make it widely used in industry, agriculture and sanitation.
As a non-toxic, biodegradable and environmentally friendly product, polyaspartic acid contains carboxyl groups in its structural units, which are easily ionized into negatively charged carboxyl anions in aqueous solution, and can complex with various metal ions. , but its single functional group limits its ability to extract heavy metal ions, thus limiting its application
[0006] In the multifunctional sewage treatment agent of the above invention, various components are simply physically combined, which cannot fundamentally solve the respective defects of bentonite and polyaspartic acid, resulting in the elimination of heavy metals when purifying water limited adsorption capacity

Method used

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  • A polyaspartic acid bentonite composite material for removing heavy metal ions and its preparation method
  • A polyaspartic acid bentonite composite material for removing heavy metal ions and its preparation method
  • A polyaspartic acid bentonite composite material for removing heavy metal ions and its preparation method

Examples

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Effect test

Embodiment 1

[0042] A method for preparing a polyaspartic acid bentonite composite material for removing heavy metal ions, comprising the following steps:

[0043] (1) Mix maleic anhydride with 12.5 times its mass of deionized water, pour it into a reaction kettle, heat up to 60°C under airtight conditions, stir for 30 minutes, and rotate at 1200r / min to make maleic anhydride Hydrolysis yields maleic acid solution.

[0044] (2) Feed liquid ammonia into the reactor, the temperature is 20°C, the pressure is 101325Pa, the flow rate is 70mL / min, and the amount of liquid ammonia is 1:1.3 of maleic acid and liquid ammonia. . Continue to increase the temperature of the reactor to 80°C, pass nitrogen into the reactor to control the pressure in the reactor at 3MPa, stir and react for 120min, the rotating speed is 1200r / min, and then dry at 80°C to obtain maleic acid Ammonium salt solid and spare.

[0045] (3) Put the maleic acid ammonium salt solid into a muffle furnace, roast at 200°C for 4 hou...

Embodiment 2

[0054] A method for preparing a polyaspartic acid bentonite composite material for removing heavy metal ions, comprising the following steps:

[0055] (1) Mix maleic anhydride and deionized water 5 times its mass, pour it into a reaction kettle, heat up to 55°C under airtight conditions, stir for 35 minutes, and rotate at 500r / min to make maleic anhydride Hydrolysis yields maleic acid solution.

[0056] (2) Feed liquid ammonia into the reactor, the temperature is 18°C, the pressure is 101000Pa, the flow rate is 40mL / min, the amount of liquid ammonia is 1:0.9 in the ratio of maleic acid to liquid ammonia . Continue to increase the temperature of the reactor to 70°C, pass carbon dioxide into the reactor to control the pressure in the reactor at 1MPa, stir the reaction for 100min, and the rotating speed is 500r / min, then dry at 75°C to obtain maleic acid Ammonium salt solid and spare.

[0057] (3) Put the maleic acid ammonium salt solid into a muffle furnace, roast at 170°C fo...

Embodiment 3

[0066] A method for preparing a polyaspartic acid bentonite composite material for removing heavy metal ions, comprising the following steps:

[0067] (1) Mix maleic anhydride and deionized water 20 times its mass, pour it into the reaction kettle, heat up to 65°C under airtight conditions, stir for 25min, and rotate at 2000r / min to make maleic anhydride Hydrolysis yields maleic acid solution.

[0068] (2) Feed liquid ammonia into the reactor, the temperature is 22°C, the pressure is 102000Pa, the flow rate is 100mL / min, the amount of liquid ammonia is 1:1.7 in the ratio of maleic acid to liquid ammonia . Continue to increase the temperature of the reactor to 90°C, pass air into the reactor to control the pressure in the reactor at 5MPa, stir and react for 140min, and the rotating speed is 2000r / min, then dry at 85°C to obtain maleic acid Ammonium salt solid and spare.

[0069] (3) Put the maleic acid ammonium salt solid in a muffle furnace, roast at 230°C for 2 hours to ob...

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Abstract

The invention relates to the field of water treatment preparations and discloses a polyaspartic acid and bentonite composite material for removing heavy metal ions and a preparation method thereof. The polyaspartic acid and bentonite composite material is prepared from polysuccinimide, bentonite and a silane crosslinking agent used as raw materials, wherein the mass ratio of the bentonite to the polysuccinimide is 1 to 0.1-10, the mass of the silane crosslinking agent is 1-10% of the mass of the polysuccinimide, and the polysuccinimide is prepared from cis-butenedioic acid and liquid ammonia according to the mass ratio of 1 to 0.9-1.7. Firstly, the liquid ammonia is used as an ammonia source in the polysuccinimide preparation process, the nitrogen source in the polysuccinimide preparation process is enriched, and the nitrogen utilization efficiency is also improved; secondly, the bentonite is used as the raw material, the cost is low, the performance is excellent, the polyaspartic acid is an environmentally friendly material and can be degraded into amino acid micro-molecules by microbes and fungi, and finally water and carbon dioxide innocuous to the environment are generated.

Description

technical field [0001] The invention relates to the field of water treatment preparations, in particular to a polyaspartic acid bentonite composite material for removing heavy metal ions and a preparation method thereof. Background technique [0002] With the continuous increase of the world population and the rapid development of industrial and agricultural production, the pace of human modernization is gradually accelerating, but the problem of environmental pollution is becoming more and more serious. Among them, heavy metal pollution has become one of the most serious environmental problems, and has been greatly appreciated by people. How to deal with heavy metal ions in water is an important topic in the field of water treatment. [0003] At present, chemical methods, ion exchange methods, membrane separation methods, biological methods, adsorption methods, etc. are mainly used for the treatment of wastewater containing heavy metal ions. Chemical methods can be divided...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26C08J3/24C08L79/08B01J20/30C02F1/28C02F101/20
CPCB01J20/12B01J20/264C02F1/288C02F2101/20C08J3/24C08J2379/08
Inventor 童东绅陈焕新吾石华胡军
Owner NINGBO ZHETIE JIANGNING CHEM
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