The selective removal of Hg²⁺ from waste acids containing high concentrations of other metal cations, such as Cu²⁺, Zn²⁺, and Cd²⁺, which are discharged from nonferrous metal smelting industries, is in great demand. Herein, sulfureted Fe₂TiO₅ was developed as a regenerable magnetic sorbent to recover Hg²⁺ from waste acids for centralized control. Sulfureted Fe₂TiO₅ exhibited an excellent ability for Hg²⁺ removal with the capacity of 292–317 mg g⁻¹ and the rate of 49.5–57.6 mg g⁻¹ h⁻¹ at pH=2–4. Meanwhile, it exhibited an excellent selectivity for Hg²⁺ removal that not only the coexisting Cu²⁺, Zn²⁺, and Cd²⁺ can scarcely be adsorbed but also Hg²⁺ adsorption was hardly inhibited. The mechanism and kinetic studies indicated that the Fe²⁺ in the FeS₂ coated on sulfureted Fe₂TiO₅ was exchanged with Hg²⁺ adsorbed at a Fe²⁺ to Hg²⁺ mole ratio of 1:2. Meanwhile, most of the Hg²⁺ removed by sulfureted Fe₂TiO₅ can be thermally desorbed primarily as ultra-high concentrations of gaseous Hg⁰, which can finally be recovered as liquid Hg⁰ for centralized control in combination with existing Hg⁰-recovery devices in smelters. Moreover, the spent sulfureted Fe₂TiO₅ could be regenerated for duty-cycle operations with re-sulfuration without a remarkable degradation of the Hg²⁺-removal performance. Therefore, Hg²⁺ recovery using sulfureted Fe₂TiO₅ may be a promising, low-cost, and environmentally friendly technology for the centralized control of Hg²⁺ in waste acids discharged from smelters.

从有色金属冶炼行业排放的含有高浓度其他金属阳离子如Cu ²⁺、Zn ²⁺和Cd ²⁺的废酸中选择性去除Hg ^{2+的需求很大。}本文开发了硫化Fe ₂ TiO ₅作为可再生磁性吸附剂从废酸中回收Hg ^{2+以进行集中控制。}硫化Fe ₂ TiO ₅表现出优异的Hg ²⁺去除能力，容量为292-317 mg g ^-1，速率为49.5-57.6 mg g ^-1 h ^-1在 pH = 2–4 时。^{同时，它表现出优异的Hg 2+}去除选择性，不仅难以吸附共存的Cu ²⁺、Zn ²⁺和Cd ²⁺ ，而且几乎不抑制Hg ²⁺的吸附。机理和动力学研究表明，硫化Fe ₂ TiO ₅上包覆的FeS _2中的Fe ²⁺与吸附的Hg 2+ 交换，Fe ²⁺与^Hg 2+^的摩尔比为1:2。同时，硫化Fe ₂ TiO ₅去除的大部分Hg ²⁺主要可热解吸为超高浓度的气态Hg ⁰，最终可回收为液态Hg ^{0 ，与冶炼厂现有的Hg 0}回收装置相结合进行集中控制。此外，用过的硫化Fe ₂ TiO ₅可以再生用于具有再硫化的工作循环操作，而不会显着降低Hg ²⁺去除性能。因此，硫化Fe ₂ TiO ₅回收Hg ²⁺可能是集中控制冶炼厂排放废酸中Hg ²⁺的一种有前景的、低成本、环保的技术。