Enhanced arsenite removal from water using zirconium-ferrocene MOFs coupled with peroxymonosulfate:oxidation and multi-sites adsorption mechanism

作者：Li, Zongchen; Ma, Shengjia; Sang, Linfeng; Qu, Guojuan; Zhang, Tao; Xu, Bin; Jin, Wei; Zhao, Yaping^*

来源：Chemosphere, 2023, 319: 138044.

DOI：10.1016/j.chemosphere.2023.138044

• Arsenite
• MOFs
• Ferrocene
• Multi-sites adsorption
• Oxidation

The efficient removal of arsenite (As(III)) poses a significant challenge to traditional water treatment technologies due to its high toxicity and mobility. In this work, multifunctional Zirconium-Ferrocene Metal Organic Framework (ZrFc-MOF) fabricated with redox-active 1,1-ferrocene dicarboxylic acid ligands and Zr4+ precursors were elaborated to achieve remarkably enhanced As(III) removal via activation by peroxymonosulfate (PMS). The adsorption affinity coefficient increased from 0.097 to 2.035 L mg(-1) and the maximum adsorption capacity increased from 59.79 to 111.34 mg g(-1) compared with that without PMS. Besides the conventional homogeneous PMS oxidation and the following adsorption through Zr-O clusters of ZrFc-MOFs, the enhanced As(III) removal synergistic combines the oxidation mechanism of As(III) by reactive oxygen species (center dot OH, SO4 center dot-, O-2(center dot-) and O-1(2)) formed in Ferrocene (Fc) activating PMS process with the simultaneous formed extra adsorption sites of Ferrocenium (Fc(+)). PMS also help ZrFc-MOF to avoid destruction in harsh alkaline condition, making the effluent in this advanced treatment meet the World Health Organization (WHO) threshold of 10 mu g L-1 over a wide range of initial pH (2-11) with high selectivity and durability. These results indicate that this novel Fc-based MOFs activating PMS system has potential applicability for As(III) in oxidation and selectively capturing in the water environment.

• 单位
  同济大学