Synthesis and Application of a High Molecular Heavy Metal Scavenger

Abstract

The invention discloses synthesis and application of a macromolecular heavy metal chelating agent, and belongs to the field of macromolecular materials, environmental engineering and sewage treatment. The macromolecular heavy metal chelating agent contains dithiocarbamic groups and amide groups, is a macromolecular polymer and has a flocculent precipitate effect by itself. The macromolecular heavy metal chelating agent is good in water solubility, capable of reacting with heavy metal in water and wide in pH application range, it is not needed to add a flocculating agent when the heavy metal is treated, the raw materials are low in price, synthetic reaction is short in time, an obtained product is a white solid convenient to transport and can react with kinds of heavy metal in an ionic or complexing state and cause flocculent precipitate, and the chelating agent can be used for chelating, flocculating and removing the heavy metal, in the ionic or complexing state, in the industrial sewage to achieve application of macromolecular materials to the environmental protection field.

Description

technical field [0001] The invention relates to the synthesis and application of a polymer heavy metal trapping agent, belonging to the fields of polymer materials, environmental engineering and wastewater treatment. Background technique [0002] In recent years, my country's industrial development level has improved rapidly. While promoting economic development and improving people's living standards, the problem of non-standard heavy metal wastewater discharge has also followed and has become increasingly serious. Statistics show that my country produces about 40 billion tons of industrial wastewater every year, of which heavy metal wastewater accounts for about 60%. These wastewaters not only seriously pollute surface water and groundwater, causing a sharp decline in the total amount of available water resources, but also increase the content of heavy metals in the soil, endangering human health. To this end, the state has formulated the "Twelfth Five-Year Plan" for Comp...

AI Technical Summary

Problems solved by technology

[0007] (1) The removal effect of complexed heavy metals in wastewater is not good, and multiple heavy metals cannot be removed at the same time

[0008] (2) The synthesis reaction time is long, and the reaction time in some synthesis processes even takes 1 to 2 days

[0009] (3) The grafting efficiency of DTC-like functional groups is low, resulting in a large amount of wastewater treatment, and the addition of flocculants is also required during the settling process

[0010] (4) The ratio of raw materials polyethyleneimine, sodium hydroxide solution, carbon disulfide, and water is unreasonable, especially the excess of carbon disulfide is too much, which not only increases the production cost, but also the excessive carbon disulfide does not completely react or occurs side reactions or from the reaction system Insufficient response due to loss of medium

[0011] (5) The product is liquid and not easy to transport

[0012] (6) When treating heavy metal wastewater, the pH of the wastewater needs to be adjusted, and the effectiveness of trapping heavy metals will be lost under strong acidic conditions and strong alkalinity

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