Heavy metal removal preparation, and synthesis method and application thereof

A synthesis method and heavy metal technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as secondary pollution, difficult post-treatment of regeneration fluid, and inability to remove, etc., to achieve a perfect connection , the effect of increasing the difficulty of synthesis and the cost of separation

Active Publication Date: 2019-09-06
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that some cadmium, nickel, and zinc in electroplating wastewater containing cadmium, nickel, and zinc are tightly chelated chelated metal ions, which cannot be removed by conventional precipitation techniques.
In recent years, heavy metal adsorbents made of chelating resins have been used more and more, but chelating resins are very expensive, the adsorption and regeneration steps are cumbersome, and the post-treatment of the regeneration solution is difficult, which is easy to cause secondary pollution

Method used

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  • Heavy metal removal preparation, and synthesis method and application thereof
  • Heavy metal removal preparation, and synthesis method and application thereof
  • Heavy metal removal preparation, and synthesis method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0083] Add 6.20g of 1,2-dichloroethane and 8.50g of ammonia solution with a concentration of 25-28% (the molar ratio of dichloroethane / ammonia is about 1:2) into a 100ml reactor, seal it, and put it under magnetic force at 100°C React under stirring for 4h;

[0084] Slowly add 5ml of 40% sodium hydroxide aqueous solution in the reactor again, adjust pH to 9.6, then add 9.50g carbon disulfide (the mol ratio of dichloroethane / NaOH / carbon disulfide is about 1:0.8:2), seal, 50 ℃ under magnetic stirring for 4h.

[0085] Cooling after the above-mentioned process ends, insoluble part (dithiocarbamic acids) in the product is dissolved in alkali again, obtains the heavy metal removal preparation mentioned in the present invention after remaining ammonia evaporates, and gained yield (dichloroethane's conversion) was 86%. Infrared spectrum (FT-IR) and high resolution mass spectrometry (TOF-MS) of the obtained preparation are as follows: figure 1 and figure 2 Shown in A.

Embodiment 2

[0087] Add 6.20g 1,2-ethylene dichloride, 8.50g concentration in the 100ml reactor and be the aqueous ammonia solution of 25-28%, 15ml concentration is the aqueous sodium carbonate solution of 40% (the mole of ethylene dichloride / ammonia / sodium carbonate The ratio is about 1:2:0.9), sealed, and reacted at 100°C for 4h;

[0088] Add 9.50 g of carbon disulfide to the reactor (the molar ratio of dichloroethane / carbon disulfide is about 1:2), seal it, and react for 4 hours under magnetic stirring at 60°C.

[0089] After the above process is finished, cool down, and dissolve the insoluble part (dithiocarbamic acids) in the product with alkali, and evaporate the remaining ammonia to obtain the heavy metal removal preparation mentioned in the present invention, with a yield of 83.7%. Infrared spectrum (FT-IR) and high resolution mass spectrometry (TOF-MS) of the obtained preparation are as follows: figure 1 and figure 2 Shown in B.

Embodiment 3

[0091] In the 100ml reactor, add 6.20g 1,2-dichloroethane, 8.5g concentration and be 25-28% ammonia solution, 5ml40% sodium hydroxide aqueous solution, 9.50g carbon disulfide (dichloroethane / ammonia / hydroxide The molar ratio of sodium / carbon disulfide is about 1:2:0.8:2), sealed, and reacted under magnetic stirring at 100°C for 4h. The reaction kettle was opened to take out the product, and all finished products were obtained after evaporation of the remaining ammonia, which was the heavy metal removal preparation mentioned in the present invention, and the yield was 89.3%. Infrared spectrum (FT-IR) and high resolution mass spectrometry (TOF-MS) of the obtained preparation are as follows: figure 1 and figure 2 Shown in C.

[0092] The remaining ammonia collected after evaporative cooling is recovered and used as a reactant.

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Abstract

The invention relates to a heavy metal removal preparation, and a synthesis method and an application thereof. The synthesis method comprises the following steps: one-pot synthesis of the heavy metalremoval preparation from dichloroalkane, ammonia and carbon disulfide in the presence of an alkaline substance especially a weakly alkaline substance, and distillation off of the remaining ammonia. The synthesis of the heavy metal removal preparation of the invention adopts the dichloroalkane and ammonia with low prices as raw materials, and is obtained through a two-step or one-step reaction by the one-pot process, so the cost is low, and the yield is high. The synthesis method breaks through the abuses and defects of the prior art using ethylenediamine as a raw material, and significantly reduces the production cost; and the prepared heavy metal removal preparation still maintains a stable heavy metal removal performance under an extremely low pH condition, and plays a great role in theremoval of heavy metals from wastewater in actual electroplating and smelting industries.

Description

technical field [0001] The invention relates to the technical field of heavy metal pollution control, in particular to a heavy metal removal preparation and its synthesis method and application. Background technique [0002] Heavy metal pollution has almost spread all over the world, and heavy metal pollution has been found in many parts of the world. The problem of heavy metal pollution in my country is even more prominent. The bottom of rivers, lakes and reservoirs is seriously polluted, and the rate of heavy metal pollution is extremely high. Various mining, metal smelting, electroplating industry, chemical fertilizer industry, etc. produce a large amount of heavy metal-containing wastewater, which is discharged into the environmental water body, resulting in a sharp increase in the heavy metal content in the environmental water body, causing watershed pollution. Heavy metals that pollute the environment mainly include mercury, cadmium, chromium, lead, nickel, copper, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/30B01J20/26C02F101/10C02F101/20
CPCB01J20/262C02F1/285C02F2101/103C02F2101/20
Inventor 郭学军
Owner BEIJING NORMAL UNIVERSITY
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