Outstanding performance of magnetically separable sulfureted MoO3/Fe-Ti spinel for gaseous Hg0 recovery from smelting flue gas: Mechanism and adsorption kinetics.
Outstanding performance of magnetically separable sulfureted MoO3/Fe-Ti spinel for gaseous Hg0 recovery from smelting flue gas: Mechanism and adsorption kinetics.
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磁可分离硫化MoO3/Fe-Ti尖晶石用于从冶炼烟气中回收气态Hg0的杰出性能：机理和吸附动力学。
DOI：
10.1021/acs.est.0c01373
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发表时间：
2020-05
影响因子：
11.4
通讯作者：
Yang Shijian
中科院分区：
文献类型：
--
作者：
Wang Chang;Zhang Xufan;Mei Jian;Hu Qixing;Yang Shijian
为替代工艺复杂、危害性大的Bolten-Norzink法，采用磁性可再生硫化MoO 3/Fe-Ti尖晶石法从冶炼烟气中回收Hg 0，以保证生产的H2SO 4不含汞。硫化MoO 3/Fe-Ti尖晶石对气态Hg 0具有良好的吸附性能，在60 °C时的平均吸附速率为93.3 μg g-1 min-1，吸附容量为66.3mg g-1，远优于大多数已报道的吸附剂。同时，硫化后的MoO 3/Fe-Ti尖晶石具有优良的超顺磁性，磁化强度为19.9 emu g-1，无需专门的沉淀剂或将粉状吸附剂成型为整体吸附剂即可实现磁分离。为探讨MoO 3负载对硫化Fe-Ti尖晶石吸附Hg 0的促进作用机理，比较了硫化MoO 3/Fe-Ti尖晶石和硫化Fe-Ti尖晶石对Hg 0的吸附动力学参数。MoO 3负载量的增加是由于硫化后Fe-Ti尖晶石对Hg 0物理吸附的吸附位显著增加，主要与层状MoS 3的形成有关。
To replace the hazardous and complicated Boliden-Norzink technology, the technology of Hg0 recovery from smelting flue gas by magnetic and reproducible sulfureted MoO3/Fe-Ti spinel was employed to keep the produced H2SO4 free of Hg. The sulfureted MoO3/Fe-Ti spinel showed excellent performance to capture gaseous Hg0 with an average adsorption rate of 93.3 μg g-1 min-1 and an adsorption capacity of 66.3 mg g-1 at 60 °C, which was much better than that of most of the other reported sorbents. Meanwhile, the sulfureted MoO3/Fe-Ti spinel exhibited excellent super-paramagnetism and its magnetization of 19.9 emu g-1, which ensured that it could easily be magnetically separated without a specialized precipitator or the molding of pulverous sorbents to monolithic sorbents. To investigate the promotion mechanism of MoO3 loading on Hg0 adsorption onto the sulfureted Fe-Ti spinel, the Hg0 adsorption kinetic parameters of the sulfureted MoO3/Fe-Ti spinel and sulfureted Fe-Ti spinel, resulting from the fitting of the adsorption breakthrough curves based on the kinetic model, were compared. The promotion of MoO3 loading was attributed to the remarkable increase in the adsorption sites on the sulfureted Fe-Ti spinel for Hg0 physical adsorption, which was mainly related to the formation of layer MoS3.
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