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Method for embedding adsorbent of poly m-phenylene diamine by using polyvinyl alcohol

A technology of poly-m-phenylenediamine and polyvinyl alcohol, applied in chemical instruments and methods, and other chemical processes, to achieve good mass transfer performance, simple operation, and low cost

Inactive Publication Date: 2009-08-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above are all attempts to improve on the basis of using boric acid as a cross-linking agent, but there is no report of using polyvinyl alcohol as an embedding agent without using boric acid as a cross-linking agent

Method used

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  • Method for embedding adsorbent of poly m-phenylene diamine by using polyvinyl alcohol
  • Method for embedding adsorbent of poly m-phenylene diamine by using polyvinyl alcohol
  • Method for embedding adsorbent of poly m-phenylene diamine by using polyvinyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 4g of polyvinyl alcohol in 46mL of hot water at about 90°C, cool it to about 40°C after dissolving, and prepare a polyvinyl alcohol solution with a weight concentration of 8wt%. Measure 10mL of the polyvinyl alcohol solution into a 200mL beaker, add 0.8g of poly-m-phenylenediamine powder, stir evenly with a glass rod and ultrasonicate for about 20 minutes to promote the two to mix evenly, and carry out the cross-linking reaction at about 40°C for 24 hours . Pour the mixture into a clean and dry petri dish and spread it into a flat plate about 5mm thick. After drying at 40°C, the film was then cut into 10 mm square blocks for further use. According to the damage rate test, the damage rate of the polym-phenylenediamine adsorbent embedded with polyvinyl alcohol was 10.2%. Detected by static adsorption method, the initial concentration of unswelled polym-phenylenediamine adsorbent embedded in polyvinyl alcohol to 25mL was 487.3mg·L -1 Mercury nitrate was adsorbe...

Embodiment 2

[0029] The amount of poly-m-phenylenediamine powder used is 1.2g, the preparation method is the same as in Example 1, and the cross-linking reaction is carried out at about 40°C for 24 hours. After the damage rate test, the damage rate of the poly-m-phenylenediamine adsorbent embedded with polyvinyl alcohol was 12.3%.

[0030] Detected by static adsorption method, the initial concentration of unswelled polym-phenylenediamine adsorbent embedded in polyvinyl alcohol to 25mL was 487.3mg·L -1 Mercury nitrate was adsorbed for 2 hours, the adsorption capacity was 188.34mg / g, and the removal rate was 77.30%.

[0031] The obtained block poly(m-phenylenediamine) adsorbent embedded in polyvinyl alcohol was swelled in distilled water for 4 hours, and then detected by static adsorption method, the measured concentration in 25mL was 487.3mg L -1The adsorption capacity of lead nitrate was 188.66mg / g, and the removal rate was 77.43%; the swelling time was changed to 6 hours, and the static ...

Embodiment 3

[0033] The difference from Example 1 is that the amount of poly-m-phenylenediamine powder is 1.6g, and the cross-linking reaction is carried out at about 40°C for 24 hours. As for the poly-m-phenylenediamine adsorbent, the breakage rate of the poly-m-phenylenediamine adsorbent embedded with polyvinyl alcohol is 17.4%.

[0034] The static adsorption method was used to detect that the initial concentration of polym-phenylenediamine adsorbent embedded in polyvinyl alcohol without swelling to 25 mL was 487.3 mg L -1 Mercury nitrate was adsorbed for 2 hours, the adsorption capacity was 201.38mg / g, and the removal rate was 82.65%.

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Abstract

The invention discloses a method for embedding poly-m-phenylenediamine adsorbent with polyvinyl alcohol, which is characterized in that it comprises the following steps: mixing poly-m-phenylenediamine and polyvinyl alcohol with a weight ratio of 0.8-2:1 In solution form mix well. The method of the invention can be used to prepare the poly-m-phenylenediamine adsorbent embedded in polyvinyl alcohol, and the prepared poly-m-phenylenediamine adsorbent embedded in polyvinyl alcohol can be used to adsorb heavy metal ions, especially lead ions.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to an embedding method of heavy metal ion adsorbent polym-phenylenediamine. Background technique [0002] As a heavy metal ion, lead ion itself has considerable toxicity. If the waste liquid containing lead ion is discharged directly, it will cause great harm to the environment. Therefore, the discharged waste liquid needs to be treated. The polym-phenylenediamine synthesized by chemical oxidative polymerization has good adsorption properties to lead ion (Mei-Rong Huang, Qian-Yun Peng, Xin-Gui Li. Rapid and Effective Adsorption of Lead Ions on Fine Polyphenylenediamine Microparticles.Chemistry, A European Journal, 2006, 12, 4341-4350. Huang Meirong, Li Xingui, Peng Qianyun polyphenylenediamine used as lead ion adsorbent, publication number: CN1840235). However, since the primary polymer itself is in the form of powder, it is inconvenient to use i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30
Inventor 黄美荣谢素芬李新贵
Owner TONGJI UNIV