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Removal of flue gas mercury by porous carbons derived from one-pot carbonization and activation of wood sawdust in a molten salt medium
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2021-09-24 , DOI: 10.1016/j.jhazmat.2021.127336
Jianping Yang 1 , Hong Xu 1 , Hong Chen 2 , Fanyue Meng 1 , Hongxiao Zu 1 , Penglin Zhu 1 , Zequn Yang 1 , Min Li 1 , Hailong Li 1
Affiliation  

Porous carbons derived from one-pot carbonization and activation of wood sawdust in a molten salt (LiCl-KCl) medium were employed for Hg0 removal. The carbons derived from molten salt carbonization (MSC) displayed much superior Hg0 removal performance comparing with the carbons derived from N2 pyrolysis method (NC). The best molar ratio of LiCl-KCl was 59:41, the optimal molten salt temperature was 700 °C, and the best mass ratio of wood sawdust to molten salt was 1:10. The MSC displayed good applicability at 50–125 °C. The saturation Hg0 adsorption capacity of MSC was about 7828.39 μg·g−1, far exceeding those for carbonaceous adsorbents reported in literatures. A Hg0 removal mechanism over MSC was proposed, i.e., the hierarchical porous structure accelerated mass transfer of Hg0, and the Cdouble bondO groups served as electron acceptors from Hg0 atoms to form organic matter bonded mercury (Hg-OM). The molten salt could be easily separated from the mixture of MSC for recycling multiple times. Thus, molten salt carbonization method appears to be promising in one-pot carbonization and activation of biomass as efficient adsorbents for gaseous Hg0.



中文翻译:

熔盐介质中木屑一锅碳化活化所得多孔碳去除烟气汞

多孔碳来源于在熔融盐 (LiCl-KCl) 介质中的木锯屑的一锅碳化和活化,用于 Hg 0去除。与来自N 2热解法(NC)的碳相比,来自熔盐碳化(MSC)的碳表现出更优异的Hg 0去除性能。LiCl-KCl的最佳摩尔比为59:41,最佳熔盐温度为700 ℃,木屑与熔盐的最佳质量比为1:10。MSC 在 50–125 °C 下表现出良好的适用性。MSC的饱和Hg 0吸附量约为7828.39 μg·g -1,远超文献报道的碳质吸附剂。汞0提出了MSC上的去除机理,即分层多孔结构加速了Hg 0的传质,双键CO基团作为Hg 0原子的电子受体形成有机物键合汞(Hg-OM)。熔盐可以很容易地从 MSC 的混合物中分离出来,以便多次循环利用。因此,熔盐碳化法作为气态Hg 0的有效吸附剂,在生物质的一锅碳化和活化方面看起来很有前景。

更新日期:2021-09-30
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