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A kind of citric acid-polyacrylate magnetic hydrogel, its preparation method and application

A technology of polyacrylate and citric acid, applied in chemical instruments and methods, and other chemical processes, to achieve the effects of increasing adsorption capacity, reducing acidification, and facilitating recovery

Active Publication Date: 2017-05-17
莆田市科龙环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of citric acid-polyacrylate magnetic hydrogels in the adsorption of copper ions has not been reported yet.

Method used

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  • A kind of citric acid-polyacrylate magnetic hydrogel, its preparation method and application
  • A kind of citric acid-polyacrylate magnetic hydrogel, its preparation method and application
  • A kind of citric acid-polyacrylate magnetic hydrogel, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0026] A kind of citric acid-polyacrylate magnetic hydrogel, its preparation method is as follows:

[0027] According to the raw material ratio in Table 1, weigh acrylic acid (AA) in a 100ml beaker, add 30% NaOH solution dropwise to the acrylic acid under stirring, after the two react, add acrylamide (AM), and mix well, Add cross-linking agent N,N-methylenebisacrylamide (MBA), ultrasonically shake to mix evenly, add magnetic Fe 3 o 4 Particles, ultrasonic vibration to fully dissolve, add citric acid, ultrasonic vibration to dissolve, then add 0.05mol / L ammonium persulfate solution, add 0.05mol / L sodium sulfite solution within 20~30s, mix well, put in 70℃ water bath heated and stirred until solidified, and then dried in an oven at 60°C to obtain the citric acid-polyacrylate magnetic hydrogel.

[0028] The formula of citric acid-polyacrylate magnetic hydrogel in table 1 embodiment 1~5

[0029]

[0030] Among them, the magnetic Fe 3 o 4 Particles were prepared by partial ...

Embodiment 6

[0032] Example 6: Comparison of the adsorption properties of citric acid-polyacrylate magnetic hydrogel and citric acid-polyacrylate non-magnetic hydrogel

[0033] Dissolve 0.2g of BCO in 100mL of absolute ethanol, add 100mL of H 2 O Prepare a BCO solution with a mass concentration of 0.1%; dissolve 5.4 g of ammonium chloride in water, add 35 mL of ammonia water, and dilute to 100 mL to obtain an ammonium chloride-ammonia water buffer solution, adjust the pH value to 8.5 for later use.

[0034] In a 25mL colorimetric tube, add 0mL (reference), 2mL, 4mL, 6mL, 8mL, 10mL of 10.0mg / L Cu2+ Standard solution, then add 5mL of pH=8.5 ammonium chloride-ammonia buffer solution and 5mL of 1g / L BCO color developer respectively, add deionized water to make up to the mark, and shake well. After full color development for 1 h, Cu was measured by UV spectrophotometer. 2+ UV absorption spectrum such as figure 1 , absorbance vs. Cu 2+ The linear relationship of concentration C is as follows ...

Embodiment 7

[0038] Embodiment 7: the water absorption rate of the citric acid-polyacrylate magnetic hydrogel of embodiment 1~5

[0039] Accurately weigh 0.2 g of the citric acid-polyacrylate magnetic hydrogels of Examples 1 to 5, soak them in sufficient deionized water at room temperature, take them out every 1 hour, drain off the surface water, weigh and record the data . After recording, soak in deionized water again until the adsorption is saturated.

[0040] Experimental results such as Figure 4 As shown, after 9 hours of adsorption, the weight remained basically unchanged, indicating that the citric acid-polyacrylate magnetic hydrogel had been adsorbed and saturated. The water absorption rates of the citric acid-polyacrylate magnetic hydrogels of Examples 1 to 5 are respectively: 111.11, 114.79, 132.16, 22.16, and 16.37, and the water absorption rates of the citric acid-polyacrylate magnetic hydrogels of Example 3 are the highest. The citric acid-polyacrylate magnetic hydrogel of...

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Abstract

The invention discloses a citric acid-polyacrylate magnetic hydrogel, a preparation method and an application thereof. A NaOH solution is added into acrylic acid with stirring; acrylamide is added; a cross-linking agent is added; after uniform mixing, magnetic Fe3O4 particles and citric acid are added; after dissolving, ammonium persulfate and sodium sulfite are added; after uniform mixing, heating and stirring are carried out at 70 DEG C till solidification; and after drying, the citric acid-polyacrylate magnetic hydrogel is obtained. The citric acid-polyacrylate magnetic hydrogel is a new environment-friendly adsorption material, which has large adsorption quantity without any influence to the soil pH value, and is convenient for recovery.

Description

technical field [0001] The invention relates to a citric acid-polyacrylate magnetic hydrogel, its preparation method and application. Background technique [0002] With the discharge of "three wastes" in industrial production such as chemical industry, electroplating, electronics and tanning, and the characteristics of universality, concealment, long-term, irreversibility and migration and transformation of heavy metal pollution, the harm of heavy metal pollution to the ecological system and the human body The impact on health has attracted increasing attention, and it is urgent to control heavy metal pollution. At present, the remediation of heavy metal-contaminated soil mainly adopts physical and chemical methods, the mechanism of which is to change the existing form of heavy metals in the soil from an active state to a stable state, thereby reducing their mobility and bioavailability in the environment; or Removal of heavy metals from soil so that their residual concentr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/56C08F2/44C08K3/22C08K5/092B01J20/26B01J20/30
Inventor 傅丽君杨磊胡文英吴海成黄桂华
Owner 莆田市科龙环保技术有限公司
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