Superselective Hg(II) Removal from Water Using a Thiol-Laced MOF-Based Sponge Monolith: Performance and Mechanism

• DOI: 10.1021/acs.est.1c07480
• Publication Date: 2022-02-03T15:14:01Z
• Authors: Kaixing Fu; Xia Liu; Chunyu Lv; Jinming Luo; Mingxing Sun; Shenglian Luo; John C. Crittenden
• Keywords: Monolith; Mercury; Thiol

Point-of-use (POU) devices with satisfying mercury (Hg) removal performance are urgently needed for public health and yet scarcely reported. In this study, a thiol-laced metal–organic framework (MOF)-based sponge monolith (TLMSM) has been investigated Hg(II) as the POU device its benchmark application. The resulting TLMSM was characterized by remarkable chemical resistance, mechanical stability, hydroscopicity (>2100 wt %). Importantly, exhibited high adsorption capacity (∼954.7 mg g–1), fast kinetics (kf ∼ 1.76 × 10–5 ms–1), broad working pH range (1–10), selectivity (Kd > 5.0 107 mL excellent regeneration capability (removal efficiency >90% after 25 cycles). applicability of in real-world scenarios verified various real water matrices (e.g., surface waters industrial effluents). Moreover, fixed-bed column test demonstrated that ∼1485 bed volumes feeding streams (∼500 μg L–1) can be effectively treated an enrichment factor 12.6, suggesting great potential devices. Furthermore, principal complexes single-layer -S-Hg-Cl double-layer -S-Hg-O-Hg-Cl -S-Hg-O-Hg-OH) formed during process under wide were synergistically systematically unveiled using advanced tools. Overall, work presents applicable approach tailoring MOF into substrate to achieve application heavy metal from water, especially Hg(II).