Magnetic Rattle-Type Fe3O4@CuS Nanoparticles as Recyclable Sorbents for Mercury Capture from Coal Combustion Flue Gas

Magnetic Rattle-Type Fe3O4@CuS Nanoparticles as Recyclable Sorbents for Mercury Capture from Coal Combustion Flue Gas
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磁响型 Fe3O4@CuS 纳米粒子作为可回收吸附剂用于从燃煤烟气中捕集汞

DOI:
10.1021/acsanm.8b00948
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发表时间:
2018-08
影响因子:
5.9
通讯作者:
Li Hailong
Li Hailong
中科院分区:
材料科学2区
文献类型:
--
作者:
Yang Zequn;Li Hailong

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采用两步法合成了拨浪鼓型Fe3O4@CuS,并首次将其用于燃煤烟气中单质汞(Hg 0)的吸附。具有强磁化的Fe 3 O 4是作为使吸附剂可回收的核的理想候选者,而稳定的CuS壳确保Fe3O4@CuS具有更高的Brunauer-Emmett-Teller(BET)表面积,具有更多暴露的活性位点和更强的磁化。75 °C的最佳操作温度允许在湿法脱硫(WFGD)和湿式静电除尘器(WESP)之间注入吸附剂,这去除了氮氧化物的有害影响。模拟烟道气(SFG)对Hg 0在Fe3O4@CuS上的吸附有轻微的抑制作用,这主要是由于水蒸气(H2O)的存在。H2O的抑制被证明是活性位阻止效应的结果,而不是广泛公认的竞争吸附效应。结果表明,该树脂对铁离子的吸附量和吸附速率均较好。
Rattle-type Fe3O4@CuS synthesized using a two-step method was applied for elemental mercury (Hg0) adsorption in coal combustion flue gas for the first time. The Fe3O4 with strong magnetization was an ideal candidate as a core to make the sorbent recyclable, while the stabilized ultrathin CuS shell assured that the Fe3O4@CuS had a higher Brunauer–Emmett–Teller (BET) surface area with more exposed active sites and stronger magnetization. The optimal operating temperature of 75 °C allowed for the injection of the sorbent between the wet desulfurization (WFGD) and wet electrostatic precipitator (WESP), which removed the detrimental influence of nitrogen oxides. Simulated flue gas (SFG) in this section showed a slight inhibitive effect on Hg0 adsorption over the Fe3O4@CuS, mainly due to the presence of water vapor (H2O). The inhibition of H2O was proven to be the result of an active site prevention effect instead of the widely recognized competitive adsorption effect. The adsorption capacity and rate of the Fe...
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