A lot of magnetic sorbents have been developed to meet the current demand for removing Cr (VI) from wastewater. However, the application of magnetic sorbents remains restricted by the unsatisfactory Cr (VI) removal efficiency, sorbent regeneration, and safe disposition of adsorbed Cr species. In this study, magnetic titanomaghemite (Fe₂TiO₅) was sulfurated with gaseous H₂S to improve its Cr (VI) removal efficiency. Sulfuration significantly improved the Cr (VI) removal efficiency of Fe₂TiO₅ from 3%–14% to 27%–82% at pH 4–10 due to drastically increased the electrostatic adsorption of Cr (VI) and heterogeneous reduction of adsorbed Cr (VI) to Cr (III). Furthermore, the sulfurated Fe₂TiO₅ recovered using magnetic separation can be regenerated by re-sulfuration without degrading the Cr (VI) removal efficiency, therefore, sulfurated Fe₂TiO₅ can be recycled for Cr (VI) removal after the regeneration. Moreover, Cr (VI) in aqueous solution can be enriched on sulfurated Fe₂TiO₅ after multiple adsorptions in the form of Cr₂O₃ in a content of more than 30% what can be considered as a source of chrome ore. Therefore, sulfurated Fe₂TiO₅ may be a promising, low-cost, and environment-friendly sorbent for Cr recovery as a co-benefit of Cr (VI) removal from wastewater.

已经开发了许多磁性吸附剂来满足当前从废水中去除 Cr (VI) 的需求。然而，磁性吸附剂的应用仍然受到不令人满意的 Cr (VI) 去除效率、吸附剂再生和吸附的 Cr 物质的安全处置的限制。在这项研究中，磁性钛磁赤铁矿 (Fe ₂ TiO ₅ ) 用气态 H ₂ S硫化，以提高其 Cr (VI) 去除效率。由于显着增加了 Cr (VI) 的静电吸附和吸附的 Cr 的异质还原，硫化显着提高了 Fe ₂ TiO ₅的 Cr (VI) 去除效率，在 pH 4-10 时从 3%–14% 提高到 27%–82% (VI) 至 Cr (III)。此外，硫化 Fe ₂使用磁选回收的TiO ₅可以通过再硫化再生而不会降低Cr（VI）的去除效率，因此，再生后的硫化Fe ₂ TiO ₅可以循环用于Cr（VI）的去除。此外，水溶液中的Cr(VI)可以在多次吸附后以Cr ₂ O ₃的形式富集在硫化Fe ₂ TiO _{5 上}，其含量超过30%，可以被认为是铬矿的来源。因此，硫化 Fe ₂ TiO ₅可能是一种有前景、低成本且环境友好的吸附剂，用于回收铬，作为从废水中去除 Cr (VI) 的共同效益。