High-performance Zn-based coordination polymers selectively adsorb mercury ions from aqueous solutions

作者：Zeng, Biao; Li, Jing; Xiong, Chao; Lin, Guo^*; Wang, Wei; Wu, Zhaoyang^*

来源：JOURNAL OF CLEANER PRODUCTION, 2022, 337: 130551.

DOI：10.1016/j.jclepro.2022.130551

• Adsorption
• MCPs
• Mechanism
• Mercury ions
• Selectivity

Mercury ions pose a serious threat to human health and there is an urgent need to control mercury pollution. In this study, we explored a new adsorbent (defined as Zn-IDC-AMT) to achieve the purpose of controlling mercury pollution. Batch experiment showed that the optimal pH, maximum adsorption quantity and thermodynamics of Zn-IDC-AMT were 3.0, 2763.87 mg/g and spontaneous endothermic, respectively. The adsorption type was chemisorption and was consistent with the pseudo-second-order kinetic model and Hill isothermal model. The selectivity of Zn-IDC-AMT to mercury ions was investigated by selective experiments. The stability of Zn-IDCAMT was studied by XRD analysis under different pH and three adsorption-desorption experiments. The results showed that Zn-IDC-AMT had excellent stability and good repeatability (the removal rate of all three times was more than 85%). In addition, XPS analysis, DFT calculation and frontier molecular orbital theory (FMO) were used to investigate the reaction mechanism, and the results confirmed that the reaction between Zn-IDCAMT and mercury ions was chelation and ion exchange, which depended on the N and S atoms reacting with mercury ions together, and the reaction product containing N-Hg bond was more stable. In short, the Zn-IDCAMT could be a promising adsorbent for effectively treating mercury pollution.

• 单位
  中山大学