Combined effects of Ag and UiO-66 for removal of elemental mercury from flue gas.
Combined effects of Ag and UiO-66 for removal of elemental mercury from flue gas.
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DOI：
10.1016/j.chemosphere.2018.01.025
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发表时间：
2018-04
期刊：
影响因子：
8.8
通讯作者：
Songjian Zhao;Dongyao Chen;Haomiao Xu;Jian Mei;Zan Qu;Ping Liu;Yong Cui;N. Yan
中科院分区：
文献类型：
--
作者：
Songjian Zhao;Dongyao Chen;Haomiao Xu;Jian Mei;Zan Qu;Ping Liu;Yong Cui;N. Yan
将纳米银掺杂到锆金属有机骨架材料UIO-66中，研究了其对烟气中汞(Hg0)的脱除性能。吸附剂的物理和化学表征表明，银的加入并没有改变UIO-66的晶体结构和形貌。银掺杂可以提高UIO-66的氧化还原活性，且具有较高的热稳定性和比表面积。除汞实验表明，UIO-66表现出比P25和活性碳更好的去除Hg0的性能，添加Ag的UIO-66与UIO-66表现出明显的协同效应，在50 °C时，UIO-66对Hg0的吸附能力最大(3.7 mg/g)。此外，对其去除机理进行了探讨，发现低温下通过形成银汞齐和通道吸附去除Hg0，高温下通过Ag-活性氧氧化和通道捕获去除Hg0。
The zirconium metal-organic framework material UiO-66 was doped with Ag nanoparticles and investigated for the removal of elemental mercury (Hg0) in flue gas. Physical and chemical characterization of the adsorbents showed that adding Ag did not change the crystal structure and morphology of the UiO-66. Ag doping can improve the redox activity of UiO-66, and the adsorbent exhibited high thermal stability and surface area. Hg0removal experiments indicated that UiO-66 exhibited the higher performance compared with P25 and activated carbon, and the addition of Ag exhibited a significant synergistic effect with the UiO-66, which had highest Hg0adsorption capacity (3.7 mg/g) at 50 °C. Furthermore, the Hg0removal mechanism was investigated, revealing that Hg0is removed by the formation of an Ag amalgam and channel adsorption at low temperature, and through Ag-activated oxygen oxidation and channel capture at high temperature.