CIESC Journal ›› 2018, Vol. 69 ›› Issue (5): 2127-2136.doi: 10.11949/j.issn.0438-1157.20171199

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Scale/corrosion inhibition and biodegradation of lysine modified polyaspartic acid

LIU Xinhua1, ZHOU Kun2, HAN Jie3, CHEN Zhihui4, LI Huijuan1   

  1. 1. Department of Chemistry, Tangshan Normal University, Tangshan 063000, Hebei, China;
    2. Hebei Chemical & Pharmaceutical College, Shijiazhuang 050026, Hebei, China;
    3. Tangshan Environmental Monitoring Center, Tangshan 063000, Hebei, China;
    4. College of Information Engineering, North China University of Science and Technology, Tangshan 063000, Hebei, China
  • Received:2017-08-30 Revised:2017-12-21 Online:2018-05-05 Published:2017-12-29
  • Supported by:

    supported by Hebei Iron and Steel Union Natural Fund (B2017209228) and the Doctoral Fund of Tangshan Normal University (2018A04).


A poly-aspartic acid derivative (Lys-PASP) was synthesized by ammonia reaction of L-lysine. FTIR characterization of the polymer demonstrated that Lys-PASP contained carboxyl and amide groups. SEM study indicated that adding Lys-PASP changed growth process and morphology of CaCO3 and CaSO4 crystals such that loose and fine calcium scale could be formed, which prevented developing dense-structured calcium scale and achieved a good scale inhibition. The addition of Lys-PASP also caused lattice distortion of calcium scale crystals and inhibited surface pitting corrosion. Besides, a layer of adsorption film on surface by chemical and physical adsorption assisted to achieve a better corrosion inhibition effect. The scale inhibition efficiency of Lys-PASP graft copolymer to CaCO3 and CaSO4 was closely related to Lys-PASP dosage, Ca2+ concentration and system temperature. At 10 mg·L-1Lys-PASP, the CaCO3 scale inhibition efficiency was 98.7% and that of CaSO4 was close to 100%. Lys-PASP exhibited good scale inhibition at temperature 80℃and Ca2+ concentration at 500 mg·L-1 and 7000 mg·L-1. Furthermore, gravimetric study showed that corrosion inhibition efficiency of Lys-PASP is 13% higher than that of PASP when both Lys-PASP and PASP were 150 mg·L-1. Lys-PASP polymer is easily biodegradable per oscillating incubator study.

Key words: polymer, scale inhibition performance, corrosion inhibition performance, degradation, adsorption

CLC Number: 

  • TQ085+.4

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