Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (7): 802-811.DOI: 10.11944/j.issn.1000-0518.2018.07.170321

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Recovery of Organphosphorus Extractants from Water by Anion Exchange Resin

Wenrou SUab,Ji CHENa*(),Yuefeng DENGa,Maohua YANGa,Chuanying LIUab   

  1. aState Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    bUniversity of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2017-09-05 Accepted:2017-11-09 Published:2018-07-06 Online:2018-07-06
  • Contact: Ji CHEN
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.61106017)

Abstract:

The adsorption process of anion exchange resin to organphosphorus extractant in water was explored in this work. By comparing the removal of P507(2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester) in water with different anion exchange resins, it is found that D201-OH(macroporous strong basic anion exchange resin) has the strongest ability to remove P507 from water, and the removal rate can reach to 99.24%. Secondly, at pH=1.0, the adsorption of P507 on D201-OH is mainly molecular adsorption and its adsorption isotherm is better fit to the Langmuir model; at pH=5.0, the anion exchange reaction is dominant and its adsorption isotherm is more suitable for the Freundlich model. Furthermore, the adsorption capacity of D201-OH to P507 reaches 99.8% of which in the adsorption equilibrium in 20 min. Kinetic study shows that the pseudo-first-order model(R2>0.99) exhibits a better fit to describe the experimental data and the adsorption rate may be controlled mainly by the film diffusion. Moreover, the adsorption capacity of D201-OH remains above 93% after eight cycles of adsorption-desorption. In summary, D201-OH is an excellent adsorbent for organphosphorus extractants with high stability in the repeated cycle. Therefore, it can be used to recover organphosphorus extractant in the practical production process.

Key words: anion exchange resin, organphosphorus extractant, adsorption mechanism, cycle experiment