Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (5): 594-599.DOI: 10.11944/j.issn.1000-0518.2018.05.170193

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Adsorption of Two Anionic Organic Dyes Methyl Orange and Alizarin Green Using a Magnetic Covalent Organic Frameworks

FU Chang'e(),CHEN Wan,DAI Zhaoxia,XIANG Qizhi   

  1. National Open University Division Teaching Department,Jiangsu Open University,Nanjing 210036,China
  • Received:2017-06-02 Accepted:2017-08-28 Published:2018-04-23 Online:2018-04-23
  • Contact: FU Chang'e
  • Supported by:
    Supported by the Natural Science Fund of Jiangsu Province(No.BK20161480), the Qing-Lan Project of Jiangsu Province and the Six Talents Peak Project of Jiangsu Province

Abstract:

Adsorption of methyl orange(MO) and alizarin green(AG-25) onto a novel magnetic covalent organic frameworks(COF) were studied via static adsorption method. The maximal adsorption capacities reach 997 mg/g for MO and 1314 mg/g for AG-25 within the pH range of 6~8 at 25 ℃. The adsorption isotherms follow Langmuir isothermal adsorption model, indicating a monolayer adsorption. The pseudo-second-order model best fits adsorption kinetics data, implying the adsorption processes are mainly chemical adsorption. Magnetic COF shows advantages of excellent adsorption performance and rapid separation, which is believed to enlarge the application of COF on the removal of anionic dyes from wastewaters.

Key words: adsorption, magnetic, covalent organic frameworks, anionic dyes