Jiangsu Key Laboratory of Anaerobic Biotechnology, School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, P. R. China.
Environ Sci Technol. 2020 Jan 7;54(1):586-594. doi: 10.1021/acs.est.9b06142. Epub 2019 Dec 16.
There is a high demand for developing a more effective and environment-friendly technology to substitute the complicated and hazardous Boliden-Norzink technology for recovering gaseous Hg from smelting flue gas. In this work, a low-cost and reproducible sorbent (FeMoS/TiO) was developed to recover gaseous Hg from smelting flue gas. FeMoS/TiO exhibited a superior ability for capturing high concentrations of Hg, with an adsorption rate of 72.2 μg g min and a capacity of 41.8 mg g at 60 °C. These were generally larger than the sums of those of FeS/TiO and MoS/TiO The kinetic model of Hg adsorption by FeS/TiO, MoS/TiO, and FeMoS/TiO were constructed according to the adsorption mechanism. Then, the structure-activity relationship of FeMoS/TiO for Hg capture was determined by comparing the kinetic parameters. The intrinsic adsorption of Hg by MoS/TiO (i.e., physically adsorbed Hg was oxidized by MoS to HgS) was inhibited marginally after FeS was incorporated. However, another Hg adsorption route (i.e., physically adsorbed Hg was oxidized by FeS to HgS) appeared on FeMoS/TiO. Its rate was significantly higher than that of FeS/TiO. Thus, a novel synergistic effect of Fe and Mo in FeMoS/TiO for Hg capture was observed.
开发一种更有效、更环保的技术来替代复杂危险的 Boliden-Norzink 技术，以从冶炼烟气中回收气态汞，这一需求很高。在这项工作中，开发了一种低成本且可重复使用的吸附剂（FeMoS/TiO），用于从冶炼烟气中回收气态汞。FeMoS/TiO 表现出优异的捕获高浓度汞的能力，在 60°C 时，其吸附速率为 72.2μg g min，容量为 41.8mg g。这些值通常大于 FeS/TiO 和 MoS/TiO 的总和。根据吸附机理，构建了 FeS/TiO、MoS/TiO 和 FeMoS/TiO 吸附 Hg 的动力学模型。然后，通过比较动力学参数，确定了 FeMoS/TiO 对 Hg 捕获的结构-活性关系。FeS 掺入后，MoS/TiO 对 Hg 的本征吸附（即物理吸附的 Hg 被 MoS 氧化为 HgS）受到轻微抑制。然而，在 FeMoS/TiO 上出现了另一种 Hg 吸附途径（即物理吸附的 Hg 被 FeS 氧化为 HgS）。其速率明显高于 FeS/TiO。因此，在 FeMoS/TiO 中观察到了 Fe 和 Mo 的协同作用。
