Method for chelating heavy metal in contaminated soil through temperature-sensitive polymer
A technology for polluted soil and polymers, applied in the field of polluted soil treatment, can solve the problem of not finding temperature-sensitive polymers, and achieve the effects of simple separation, cost reduction, and heavy metal concentration reduction
Inactive Publication Date: 2016-09-21
SHANGHAI UNIV
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However, there have been no reports on the specific application of thermosensitive polymers in heavy metal-contaminated soils so far.
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[0018] The soil used in this example is the soil of the corn experimental field in the East District of Shanghai University. 2 Shake the aqueous solution for 24 hours; then filter, wash twice with water, dry, and pass through a 2mm sieve. Described a kind of method utilizing thermosensitive polymer to chelate heavy metal in polluted soil, its steps are as follows:
[0019] (1). Take 1g of polluted soil and 10mL of temperature-sensitive polymer solution with a concentration of 0.05mmol / L, add 1g of polluted soil to 10mL of temperature-sensitive polymer solution with a concentration of 0.05mmol / L, and heat up to 37 ℃, shaking for 12 hours, the temperature-sensitive polymer and the heavy metal undergo a chelation reaction, and naturally settle for 1 hour to obtain the supernatant of the temperature-sensitive polymer containing the chelated heavy metal;
[0020] (2).Heat the above supernatant to 45°C, and centrifuge the thermosensitive polymer supernatant containing chelated heav...
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The invention discloses a method for chelating heavy metal in contaminated soil through temperature-sensitive polymer. The method includes the steps that firstly, a certain amount of the contaminated soil is added into a temperature-sensitive polymer aqueous solution for chelating reaction, natural settling is conducted, and temperature-sensitive polymer supernatant containing chelating heavy metal is obtained for 1 hour; secondly, when the supernatant is heated to 40-60 DEG C, the phase of the temperature-sensitive polymer supernatant containing chelating heavy metal is changed at phase change temperature for centrifugal separation, and temperature-sensitive polymer precipitates of chelated heavy metal are obtained; thirdly, hydrochloric acid is added dropwise into the temperature-sensitive polymer of the separated chelated heavy metal, the heavy metal is separated out from the temperature-sensitive polymer, and separated temperature-sensitive polymer is obtained; fourthly, the temperature-sensitive polymer is steamed dry, then deionized water is added for dissolving, freezing and drying are conducted, and the temperature-sensitive polymer is obtained again. The heavy metal can be separated very easily by means of the phase change characteristic of the temperature-sensitive polymer, the temperature-sensitive polymer can be recycled, cost is reduced, and the method is easy to operate and easy to apply and popularize.
Description
technical field [0001] The invention relates to a method for using a temperature-sensitive polymer to chelate heavy metals in polluted soil, and belongs to the technical field of polluted soil treatment. Background technique [0002] In recent years, with the rapid development of modern industrialization and urbanization, the problem of soil environmental pollution is becoming increasingly serious in our country. Various industrial wastewater, waste gas, livestock and poultry manure, fertilizers and pesticides, sewage irrigation, etc. have become the main sources of soil heavy metals (As, Cd, Hg, Pb, etc.), which have caused extremely serious damage to the soil. [0003] Toxic heavy metals have a long incubation period, non-degradability and difficult repair in the process of soil pollution, which reduces the fertility of soil polluted by heavy metals, reduces crop yields, and easily pollutes groundwater and accumulates in humans, animals and plants. According to statistics...
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IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 高旻天李文郑琴胡佳俊
Owner SHANGHAI UNIV