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Method for preparing pH sensitive hydrogel for adsorbing heavy metal ions and product thereof

A technology for adsorbing heavy metals and composite hydrogels, applied in the direction of adsorption of water/sewage treatment, alkali metal compounds, chemical instruments and methods, etc., can solve the problems of low efficiency of heavy metal ions, small adsorption capacity, difficult cleaning, etc., and achieve the preparation method Simple, low production cost, and strength-enhancing effects

Inactive Publication Date: 2014-02-05
CHUZHOU YOULIN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the attapulgite composite hydrogel has low efficiency and small adsorption capacity for heavy metal ions, and it is difficult to clean the gel after absorbing heavy metal ions, and the gel is not sensitive to the pH value of the solution, so it is impossible to control the pH value of the solution. to control the adsorption of heavy metal ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Pretreatment of attapulgite. Weigh 10g of attapulgite with a particle size of 300 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.

[0023] 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. Wash with distilled water unti...

Embodiment 2

[0028] (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.

[0029] Prepare a hydrochloric acid solution with a concentration of 0.5mol / L, take 20g 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. Wash with distilled water un...

Embodiment 3

[0034] (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.

[0035] 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 a pH sensitive hydrogel which has an excellent adsorbing capability on lead, cadmium, nickel and other heavy metal ions and is large in adsorption quantity, high in adsorption efficiency and sensitive to pH value of a solution, as well as a product of the pH sensitive hydrogel. The hydrogel is prepared by the following steps: washing attapulgite with water and acid; modifying the attapulgite by utilizing tannic acid; compounding with acrylic acid hydrogel. The method for preparing the adsorption type pH sensitive hydrogel has the characteristics of simple process, low cost, no special equipment and the like, and is easy for realization of industrial implementation, and the strength of the prepared gel is greatly improved. The gel can be applied to sewage treatment fields, such as electroplating industry, chemical industry and the like, can control the adsorption quantity of heavy metal ions by controlling the pH value of a solution, and can be washed and recycled.

Description

technical field [0001] The invention relates to the field of intelligent polymer materials, in particular to a pH-sensitive 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 is sensitive to the pH value of the solution. The adsorption capacity of the heavy metal ion can be controlled by controlling the pH value of the solution. The gel of the invention can be applied to the fields of sewage treatment in electroplating industry, chemical industry, etc., 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 ...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F222/38C08K9/04C08K3/34C08J3/075C08L33/02B01J20/26B01J20/28B01J20/30C02F1/28C02F1/66
Inventor 何晓春赵义平刘兴甜刘健
Owner CHUZHOU YOULIN TECH DEV
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