Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (2): 205-210.DOI: 10.11944/j.issn.1000-0518.2020.02.190196

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Efficient Removal of Arsenic by Metal Organic Framework UTSA-74 from Aqueous Solutions

YU Wenting,ZHANG Hui,SUN Yuzhen,WU Hao,LUO Mingbiao()   

  1. State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China
  • Received:2019-07-15 Accepted:2019-10-12 Published:2020-02-01 Online:2020-02-06
  • Contact: LUO Mingbiao
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21761001)

Abstract:

Metal organic framework UTSA-74 synthesized via hydrothermal method could efficiently remove both arsenate and arsenite from water. A batch test with aqueous solutions was performed, and 95% of As(Ⅴ) and 85% of As(Ⅲ) removal was obtained with the lower concentration of arsenic(~1 mg/L). This experiment data matched the pseudo-second-order model and Freundlich model. In addition, when Cl-, NO3- and PO43- all existed in solutions, PO43- affected the adsorption of arsenic obviously. After adsorption, we eluted UTSA-74@arsenic by 0.1 mol/L NaOH, the removal rate of arsenic was still up to around 70% after three cycles. XRD, SEM and IR analyses showed that the excellent adsorption capacity was due to the reformed Zn—O—As bond between arsenic and adsorbent. In a word, UTSA-74 can be the candidate for removing arsenic.

Key words: removal, arsenic, UTSA-74, mechanism