Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (3): 956.doi: 10.7503/cjcu20200443

• Materials Chemistry • Previous Articles    

Sulfonic Acid-functionalized Spherical Covalent Organic Framework with Ultrahigh Capacity for the Removal of Cationic Dyes

YAN Yanhong, WU Simin, YAN Yilun, TANG Xihao, CAI Songliang(), ZHENG Shengrun(), ZHANG Weiguang, GU Fenglong   

  1. Key Laboratory of Theoretical Chemistry of Environment,Ministry of Education,School of Chemistry,South China Normal University,Guangzhou 510006,China
  • Received:2020-07-13 Online:2021-03-10 Published:2021-03-08
  • Contact: CAI Songliang E-mail:songliangcai@m.scnu.edu.cn;zhengsr@scnu.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21603076)

Abstract:

The development of porous covalent organic frameworks(COFs) as adsorbents for highly effective and selective removal of organic pollutants from aqueous solution is desirable but remains challenging. Herein, a β-ketoenamine-linked sulfonic acid-functionalized spherical COF, namely TFP-BDSA, was synthesized by the Schiff-base reaction of 1,3,5-triformylphloroglucinol(TFP) with 2,2′-benzidinedisulfonic acid(BDSA). The anionic nature of the framework can rapidly adsorb the cationic dyes of MLB, CV, and RhB, while it is difficult for the adsorption of MO and FS anionic dyes, making it promising for the separation of cationic and anionic dyes based on a charge-dependent mode. The adsorption kinetics of cationic dyes on TFP-BDSA all followed the Pseudo-second-order adsorption kinetic model, and the adsorption process fitted well the the Langmuir adsorption model. The maximum adsorption capacities of TFP-BDSA for MLB, CV and RhB are 1116, 1429 and 1638 mg/g, respectively, in which those of CV and RhB rank as the highest values in comparison to the other reported COFs to date. This work may provide a useful idea for developing COFs-based adsorbents for fast adsorption and effective removal of organic pollutants from wastewater.

Key words: Covalent organic frameworks(COFs), Dye, Adsorption, Separation (Ed.: V, K, S)

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