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Method for preparing composite hydrogel for adsorbing heavy metal ions and product thereof

A composite hydrogel that absorbs heavy metals, applied in alkali metal compounds, adsorbed water/sewage treatment, chemical instruments and methods, etc., to achieve the effects of low production cost, increased adsorption capacity, and enhanced strength

Inactive Publication Date: 2014-01-22
CHUZHOU YOULIN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the shortcomings of the existing attapulgite composite hydrogel in the application of heavy metal ion adsorption, the technical problem to be solved by the present invention is to provide a gel with good adsorption capacity and large adsorption capacity for heavy metal ions such as lead, cadmium, nickel, and molybdenum. Preparation method and product of composite hydrogel with high adsorption efficiency and reusability after cleaning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Pretreatment of attapulgite. Weigh 10g of attapulgite with a particle size of 300 mesh, wash with 1L of distilled water, take its supernatant after precipitation, centrifuge at 500rpm for 1min, take its supernatant, add a small amount of distilled water to the supernatant and mix evenly, and then continue to centrifuge at 500rpm for 1min. Then take its supernatant, wash the supernatant repeatedly like this for 3 times, and finally carry out centrifugation with 4000rpm, take its precipitate, vacuum dry at 90°C for 24 hours, and select a sieve with the corresponding mesh size according to the particle size after grinding to sieve. Purified attapulgite was obtained.

[0022] Prepare a hydrochloric acid solution with a concentration of 0.5mol / L, add 10g of purified attapulgite and 150mL of hydrochloric acid solution into a small beaker and stir and mix. After 5min, heat the mixture to 70°C, stir for 1h, then oscillate ultrasonically for 30min, and filter with suction. ...

Embodiment 2

[0027] (1) Pretreatment of attapulgite. Weigh 10g of attapulgite with a particle size of 1000 mesh, wash it with 1L of distilled water, and take its supernatant after sedimentation, centrifuge at 500rpm for 1min, take its supernatant, add a small amount of distilled water to the supernatant and mix evenly, continue to centrifuge at 500rpm for 1min, and then take The supernatant, after repeated washing of the supernatant for 3 times in this way, is finally centrifuged at 4000rpm, and the precipitate is collected, dried in vacuum at 90°C for 24 hours, ground and sieved with a sieve corresponding to the particle size to obtain purified Attapulgite.

[0028]Prepare a hydrochloric acid solution with a concentration of 0.5mol / L, add 20g of purified attapulgite and 150mL of hydrochloric acid solution into a small beaker and stir to mix. After 5min, heat the mixture to 70°C, stir for 1h, then oscillate ultrasonically for 30min, and filter with suction. Wash with distilled water until...

Embodiment 3

[0033] (1) Pretreatment of attapulgite. Weigh 20g of attapulgite with a particle size of 300 mesh, wash it with 1L of distilled water, settle and take its supernatant, centrifuge at 500rpm for 1min, take its supernatant, add a small amount of distilled water to the supernatant and mix evenly, continue to centrifuge at 500rpm for 1min, and then take The supernatant, after repeated washing of the supernatant 5 times in this way, was finally centrifuged at 4000rpm, and the precipitate was taken, dried in vacuum at 90°C for 24 hours, ground and sieved with a sieve corresponding to the particle size to obtain purified Attapulgite.

[0034] Prepare a hydrochloric acid solution with a concentration of 3mol / L, take 10g of purified attapulgite and 150mL of hydrochloric acid solution into a small beaker and stir and mix. After 5min, heat the mixture to 80°C, stir for 2h, then oscillate ultrasonically for 30min, and filter with suction. Wash with distilled water until the pH is about 6,...

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PUM

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Abstract

The invention relates to a method for preparing composite hydrogel which has an excellent adsorption capability on lead, cadmium, nickel, molybdenum and other heavy metal ions, is large in adsorption amount and high in adsorption efficiency, and can be washed and recycled, as well as a product thereof. The composite hydrogel is prepared by the following steps: washing attapulgite with water and acid; modifying the attapulgite by utilizing tannic acid; and compounding with acrylamide hydrogel. The method for preparing the adsorption type polymer hydrogel has the characteristics of simple process, low cost, no special equipment, easy industrial implementation and the like, and the prepared gel strength is greatly improved.

Description

technical field [0001] The invention relates to the field of intelligent polymer materials, in particular to a composite hydrogel with good adsorption function for heavy metal ions such as nickel, chromium and lead, and a preparation method thereof. The hydrogel has a large adsorption capacity and high adsorption efficiency for heavy metal ions such as nickel, chromium, and lead in water, and can be applied to sewage treatment fields such as electroplating industry and chemical industry, and can be used repeatedly after cleaning. Background technique [0002] With the rapid development of the chemical industry and metallurgical industry, the pollution of wastewater containing heavy metal ions such as lead, copper, cadmium, chromium, mercury, etc. from electrolytes, electroplating solutions, and mining and metal smelting processes is becoming more and more serious. Heavy metal wastewater pollution It has become a serious environmental and social problem, and it is a key probl...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F222/38C08K9/04C08K3/34C08J3/075B01J20/26B01J20/28C02F1/28C02F1/62
Inventor 刘健张桂芳何晓春赵义平
Owner CHUZHOU YOULIN TECH DEV
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