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Heavy metal ion detection and adsorption integration polyacrylamide microgel

A technology of heavy metal ions and acrylamide, applied in the directions of alkali metal compounds, adsorbed water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problems of temperature and speed of stirring, and achieve significant selectivity. , the effect of promoting absorption

Inactive Publication Date: 2019-01-11
TIANJIN JINLIN WATER TREATMENT SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ratio of the amount of the adsorbent AMPS to the fluorescent probe CDs, as well as the temperature and speed of stirring will all affect the formed colloid.
[0008] At present, there are not many reports on the preparation of materials for the detection and adsorption of heavy metal ions, but this material has better indications for the removal of heavy metal ions in sewage

Method used

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  • Heavy metal ion detection and adsorption integration polyacrylamide microgel
  • Heavy metal ion detection and adsorption integration polyacrylamide microgel
  • Heavy metal ion detection and adsorption integration polyacrylamide microgel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 polyacrylamide microgel p(AM-CD-AMPS)

[0044] (1) Preparation of CDs: Weigh 0.48g of ethylenediamine and 0.46g of citric acid monohydrate, add them to a 50mL reaction kettle with a polytetrafluoroethylene lining, then add 10mL of ultrapure water, and ultrasonically 20- After 60 minutes, the reaction kettle was transferred to an oven at 100-300°C for 3-6 hours, and then cooled to room temperature naturally. The reacted solution was centrifuged to remove insoluble particles. After adjusting the above supernatant to pH ≈ 14.00 with a certain amount of NaOH solution, dry the solution to obtain a solid, then dissolve the solid in an appropriate amount of absolute ethanol, centrifuge to remove insoluble particles, and put the obtained carbon dot aqueous solution into Refrigerate in a refrigerator at 4°C for 1 day, and then filter with a 0.22 μm filter membrane to obtain a filtrate. The filtrate was freeze-dried to finally obtain carbon dots.

[0045] (2) Modi...

Embodiment 2

[0048] Embodiment 2 polyacrylamide microgel p(AM-CD-AMPS)

[0049] (1) Preparation of CDs: Weigh 0.96g of ethylenediamine and 0.92g of citric acid monohydrate, add them into a 50mL reaction kettle with a polytetrafluoroethylene liner, add 20mL of ultrapure water, and sonicate for 30min. The reaction kettle was transferred to an oven at 200° C. for 5 h, and then cooled to room temperature naturally. The reacted solution was centrifuged to remove insoluble particles. Use a certain amount of NaOH solution to adjust the above supernatant to pH ≈ 14.00, dry the solution to obtain a solid, then dissolve the solution in an appropriate amount of absolute ethanol, centrifuge to remove insoluble particles, and put the obtained carbon dot aqueous solution into Refrigerate in a refrigerator at 4°C for 1 day, and then filter with a 0.22 μm filter membrane to obtain a filtrate. The filtrate was freeze-dried to finally obtain carbon dots.

[0050] (2) Modification of CDs: Weigh 2 g of CDs...

Embodiment 3

[0053] Embodiment 3 polyacrylamide microgel p(AM-CD-AMPS)

[0054](1) Preparation of CDs: Weigh 1.44g of ethylenediamine and 1.38g of citric acid monohydrate, add them to a 50mL reaction kettle with a polytetrafluoroethylene liner, add 30mL of ultrapure water, and sonicate for 30min. The reaction kettle was transferred to an oven at 200° C. for 5 h, and then cooled to room temperature naturally. The reacted solution was centrifuged to remove insoluble particles. After adjusting the above supernatant to pH ≈ 14.00 with a certain amount of NaOH solution, dry the solution to obtain a solid, then dissolve the solid in an appropriate amount of absolute ethanol, centrifuge to remove insoluble particles, and put the obtained carbon dot aqueous solution into Refrigerate in a refrigerator at 4°C for 1 day, and then filter with a 0.22 μm filter membrane to obtain a filtrate. The filtrate was freeze-dried to finally obtain carbon dots.

[0055] (2) Modification of CDs: Weigh 3 g of CD...

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Abstract

The invention discloses a heavy metal ion detection and adsorption integration polyacrylamide microgel, and belongs to the field of functional polymer materials. The microgel is prepared through inverse emulsion polymerization with acrylamide as a gelling substance, carbon quantum dots (CDs) as a detection probe and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as an adsorbent. The mercury heavy metal ion detection limit of the obtained microgel is 2.3 nM, the copper heavy metal ion detection limit is 1.3 [mu]M, the iron heavy metal ion detection limit is 3.2 [mu]M, all above detection limits are lower than highest discharge standard concentrations of mercury, copper and iron heavy metal ions in drinking water in World Health Organization, and the respective adsorption quantity of the three ions is about 100 mg / g. The microgel can be washed after adsorbing the heavy metal ions in order to efficiently recover the heavy metal ions, and the microgel can be repeatedly used for detectingand adsorbing the heavy metal ions. The microgel has the advantages of no special devices during preparation, high polymerization rate, easiness in heat dissipation, easiness in industrial enforcement, and small increase of the cost.

Description

technical field [0001] The invention belongs to the field of functional macromolecular materials, and in particular relates to a polyacrylamide microgel capable of detecting and adsorbing heavy metal ions. Background technique [0002] With the rapid development of the chemical industry, many heavy metals such as lead, mercury, cadmium, cobalt, etc. enter the atmosphere, water, and soil during the mining, smelting, and processing of heavy metals, causing serious environmental pollution. Heavy metal ions are easy to accumulate through the food chain and eventually endanger human health. How to control heavy metal ions in sewage has become the top priority in the treatment of environmental water pollution. [0003] Due to the long-term and strong toxicity of heavy metal ions, in order to prevent and control heavy metal pollution, it is first necessary to achieve accurate detection of trace heavy metal ions. Commonly used detection methods for heavy metal ions include ultravi...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/26C02F1/28C02F101/20
CPCB01J20/267B01J20/28047C02F1/285C02F2101/20C02F2101/203
Inventor 孙丽李焕焕赵国部张筱烨张东东赵义平
Owner TIANJIN JINLIN WATER TREATMENT SCI & TECH CO LTD
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