China Plastics ›› 2019, Vol. 33 ›› Issue (5): 82-88.DOI: 10.19491/j.issn.1001-9278.2019.05.014

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Study on Effect of Citric-acid Hyperbranched Polyamide Leaching Agent on Removal of Heavy Metal From Soil

  

  • Received:2019-01-11 Revised:2019-01-31 Online:2019-05-26 Published:2019-06-26

Abstract: Citric-acid hyperbranched polyamide was successfully prepared by melt polymerization using alkanolamide as a core and citric acid as a monomer and its chemical structure was characterized by 1H-NMR and FTIR spectroscopy. The effects of citric-acid hyperbranched polyamide on the removal of Zn, Cd and Pb from soil were investigated by batch experiments. The results indicated that the removal efficiency of Zn, Cd and Pb from soil was improved with an increase of contact time. When citric-acid hyperbranched polyamide was used as a washing agent at an concentration of 1.0 wt%, the maximum removal efficiency was achieved for Cd and Zn at pH=3 and for Pb at pH=4.5. Citric-acid hyperbranched polyamide as a leaching agent exhibited a better removal effect on heavy metals compared to normal citric acid. Moreover, citric-acid hyperbranched polyamide presented the extraction efficiency on removal of target heavy metals in an order of Pb>Cd>Zn, and however it showed less effect on the basic physical-chemical properties of soil.