Nanosized Copper Selenide Functionalized Zeolitic Imidazolate Framework‐8 (CuSe/ZIF‐8) for Efficient Immobilization of Gas‐Phase Elemental Mercury

• DOI: 10.1002/adfm.201807191
• Publication Date: 2019-03-12T18:52:02Z
• Authors: Zequn Yang; Hailong Li; Jianping Yang; Shihao Feng; Xi Liu; Jiexia Zhao; Wenqi Qu; Pu Li; Yong Feng; Po‐Heng Lee; Kaimin Shih
• Keywords: 7. Clean energy; 01 natural sciences; 0104 chemical sciences

AbstractA key challenge in elemental mercury (Hg0) decontamination from flue gas lies in the design of a sorbent with abundant reactive adsorption sites that exhibit high affinity toward Hg0 to simultaneously achieve rapid capture and large capacity. Herein, zeolitic imidazolate framework‐8 (ZIF‐8) supported copper selenide (CuSe) nanocomposites are synthesized by a newly designed two‐step surfactant‐assisted method. The as‐prepared CuSe/ZIF‐8 with CuSe to ZIF‐8 mass ratio of 80% (0.8NC‐ZIF) exhibits unparalleled performance toward Hg0 adsorption with equilibrium capacity and average rate reaching 309.8 mg g−1 and 105.3 µg g−1 min−1, respectively, surpassing all reported metal sulfides and traditional activated‐carbon‐based sorbents. The impressive performance of 0.8NC‐ZIF for Hg0 immobilization is primarily attributed to the adequate exposure of the Se‐terminated sites with high affinity toward Hg0 resulted from the layered structure of CuSe. The adsorbed mercury selenide exhibits even higher stability than the most stable natural mercury ore—that is, mercury sulfide—hence minimizing its environmental impact when the CuSe/ZIF‐8 sorbent is dumped. This work provides a new mindset for future design of sorbents for efficient Hg0 capture from industrial flue gas. The results also justify the candidature of CuSe/ZIF to be applicable for mercury pollution remediation in real‐world conditions.