Specific Recovery and In Situ Reduction of Precious Metals from Waste To Create MOF Composites with Immobilized Nanoclusters
Specific Recovery and In Situ Reduction of Precious Metals from Waste To Create MOF Composites with Immobilized Nanoclusters
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DOI：
10.1021/acs.iecr.7b02839
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发表时间：
2017-11
影响因子：
4.2
通讯作者：
Chao-Hsien Wu;Xiangyang Zhu;Zhe Wang;Jian Yang;Yongsheng Li;Jinlou Gu
中科院分区：
文献类型：
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作者：
Chao-Hsien Wu;Xiangyang Zhu;Zhe Wang;Jian Yang;Yongsheng Li;Jinlou Gu
将活性金属（特别是贵金属）纳米组分并入金属有机框架（MOFs）中可以使MOFs具有用于创新工业应用的增强的或新的性质。尽管贵金属纳米颗粒/MOF的报道越来越多，但开发具有低成本和高金属负载的此类复合材料仍然是非常期望的。在本文中，我们展示了一种通过使用硫脲改性的UiO-66-TU的MOFs将贵金属废物转化为财富的新颖且简便的方法，作为回收和重结晶贵金属的原理证明。新的MOFs表现出优异的选择性，允许贵金属从废弃电子和电气设备（WEBs）中分离出来，这些设备通常含有不同的金属物种。UiO-66-TU在较宽的pH范围内对代表性贵金属Au有较好的萃取效果，最大Au吸附容量可达326 mg g-1。吸附的Au离子通过简单的还原处理可转化为分散性好的金属离子。
Incorporation of active metal (especially precious metal) nanocomponents into metal–organic frameworks (MOFs) could capacitate MOFs with enhanced or new properties for innovative industrial applications. Despite increasing numbers of reports of precious metal nanoparticles/MOFs, developing such composites with low cost and high metal loading is still highly desirable. Herein, we demonstrated a novel and facile method to convert precious metal waste to wealth via using thiourea modified MOFs of UiO-66-TU as a proof of principle to recover and immobilize precious metals. The new MOFs exhibited excellent selectivity which allowed for precious metals to be isolated from the waste electronic and electrical equipment (WEEE), which commonly contain different metal species. UiO-66-TU extracts a representative precious metal of Au effectively in a wide pH range, and the maximum Au adsorption capacity could approach 326 mg g–1. Through a simple reduction treatment, the adsorbed Au ions could be converted to well-di...