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Poly(m-phenylenediamine) and synthesizing and applying method thereof

A technology of poly-m-phenylenediamine and m-phenylenediamine, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problem of low poly-m-phenylenediamine synthesis yield and limited industrial Application and high cost of use, etc., to achieve good selective adsorption, reduce application cost, and improve adsorption performance

Active Publication Date: 2014-04-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high cost of these synthetic materials limits their industrial applications.
In recent years, considering the cost problem, attention has been paid to the preparation of polym-phenylenediamine adsorption materials. Its adsorption capacity for silver ions in water ranges from several hundred to 1886.6 mg / g (201110088356.1), showing good adsorption performance, but polym-phenylene diamine The synthesis yield of diamine is still low, and its adsorption performance needs to be further improved

Method used

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  • Poly(m-phenylenediamine) and synthesizing and applying method thereof
  • Poly(m-phenylenediamine) and synthesizing and applying method thereof
  • Poly(m-phenylenediamine) and synthesizing and applying method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 3.0g (0.0277mol) of m-phenylenediamine and dissolve it in 100mL of methanol, stir in a constant temperature water bath at 30°C for 15min, and mix the monomer solution evenly. Weigh 6.6g (0.0277mol) of sodium persulfate and dissolve it in 20mL of distilled water. The above-mentioned sodium persulfate solution and 20 mL of methanol solution with a concentration of 0.5 mol / L diethanolamine were simultaneously added dropwise to the reaction system at a rate of 2 mL / min, and the addition was completed in about 10 minutes. Then, the stirring reaction was continued for 3h. After the reaction, filter, and then wash the product with distilled water, 1:1 (volume ratio) ammonia water, absolute ethanol, and distilled water until it is colorless, and dry it in an oven at 60°C for 12 hours to constant weight to obtain black poly-m-phenylenediamine powder.

Embodiment 2～3

[0027] Adjust the concentration of added diethanolamine to 1, 1.5mol·L respectively -1 , other conditions were the same as in Example 1 to prepare poly-m-phenylenediamine.

Embodiment 4

[0033] Under the condition of a constant temperature water bath at 30°C, 25 mg of the polymers prepared in Examples 1 to 3 and Comparative Example 1 were used to absorb 20 mL of the polymer, and the initial concentration was 62 mmol L -1 Silver nitrate solution, the reaction continued for 72h. The reacted solution was filtered, and the concentration of silver ions in the filtrate was determined by Volhard titration. The polymers prepared by each embodiment are shown in Table 1 for the adsorption capacity of silver ions. It can be seen from the table that the product prepared by adding diethanolamine has better adsorption performance on silver ions than the product prepared without adding diethanolamine. It should be pointed out that an appropriate concentration of diethanolamine can maximize the product's adsorption performance on silver ions, and the concentration of diethanolamine is too high or too low to reduce its adsorption capacity. This may be closely related to the ...

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Abstract

The invention discloses poly(m-phenylenediamine) and a synthesizing and applying method thereof. The poly(m-phenylenediamine) is prepared by using m-phenylenediamine as a raw material, adding an oxidant into an alcohol solvent and a certain amount of diethanolamine solution, so that the morphological structure of poly(m-phenylenediamine) can be regulated, and the yield can be 87.5 percent; the maximum adsorption amount of the poly(m-phenylenediamine) product to silver ions in a water body can be over 2,318.5mg.g<-1>, the poly(m-phenylenediamine) product has excellent selective adsorbability; regarding as a low-density silver ion-containing water body, the density of the treated silver ions is far lower than 0.005ppm which is the safety value of silver to a human body in the specification of WHO (World Health Organization).

Description

technical field [0001] The invention belongs to the technical field of material preparation for treating silver-containing wastewater, and in particular relates to a poly-m-phenylenediamine adsorption material with high efficiency and high selective adsorption performance for silver ions and a synthesis and application method thereof. Background technique [0002] Silver is an important precious metal, which is widely used in decoration, electroplating, photosensitive materials, chemical industry, electronics, scientific research and other fields. Compared with other industries, the amount of silver-containing wastewater is not very large, but the direct discharge of silver-containing wastewater into the environment will not only pollute the environment, but also cause a waste of silver resources. Therefore, it is of great significance to recover the silver in the waste liquid. [0003] At present, the methods for recovering silver from silver-containing waste liquid mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 王海鹰柴立元苏珍张理源杨志辉唐崇俭杨卫春刘恢李青竹
Owner CENT SOUTH UNIV
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