1. Rapid, Selective Extraction of Silver from Complex Water Matrices with a Metal–Organic Framework/Oligomer Composite Constructed via Supercritical CO2.
- Author
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Xue, Tianwei, Peng, Li, Syzgantseva, Olga A., Syzgantseva, Maria A., Guo, Peiwen, Lai, Huiyan, Li, Ruiqing, Chen, Jiawen, Li, Shumu, Yan, Xiaomei, Yang, Shuliang, Li, Jun, Han, Buxing, and Queen, Wendy L.
- Subjects
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METAL-organic frameworks , *COMPLEX matrices , *SILVER , *SUPERCRITICAL carbon dioxide , *COMPLEX fluids , *ADSORPTION capacity , *POROUS materials - Abstract
Every year vast quantities of silver are lost in various waste streams; this, combined with its limited, diminishing supply and rising demand, makes silver recovery of increasing importance. Thus, herein, we report a controllable, green process to produce a host of highly porous metal–organic framework (MOF)/oligomer composites using supercritical carbon dioxide (ScCO2) as a medium. One resulting composite, referred to as MIL‐127/Poly‐o‐phenylenediamine (PoPD), has an excellent Ag+ adsorption capacity, removal efficiency (>99 %) and provides rapid Ag+ extraction in as little as 5 min from complex liquid matrices. Notably, the composite can also reduce sliver concentrations below the levels (<0.1 ppm) established by the United States Environmental Protection Agency. Using theoretical simulations, we find that there are spatially ordered polymeric units inside the MOF that promote the complexation of Ag+ over other common competing ions. Moreover, the oligomer is able to reduce silver to its metallic state, also providing antibacterial properties. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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