School of Environment Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Institutes of Innovation for Future Society, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
J Hazard Mater. 2022 Jun 5;431:128592. doi: 10.1016/j.jhazmat.2022.128592. Epub 2022 Feb 26.
In this study, β-Cyclodextrin (CD) modified FeS nanomaterials were synthesized by a one-step facile strategy and investigated for the removal of Cr(VI). The resulted CD-FeS exhibited enhanced removal efficiency toward Cr(VI) than bared FeS with a maximum capacity of 220.26 mg·g as the molar ratio of CD-to-FeS at 0.2. The effective performance of CD-FeS toward Cr(VI) could well maintain under oxic conditions and a wide pH range of aqueous solution. A high selectivity for Cr(VI) was achieved in the presence of coexisting cations and anions. More significantly, a single treatment step of CD-FeS effectively removed chromium from actual electroplating wastewater to the detection limit of 0.004 mg·L that far below the WHO limitation of Cr (VI) (<0.05 mg·L) combing with the rapid magnetic separation without adjusting the pH value of wastewater at 7. The effective removal of Cr (VI) by CD-FeS involved a complex process of surface adsorption/reduction, and solution homogenous reduction and subsequent sequestration of Cr(III) achieving the effective removal of aqueous total Cr. The superior Cr (VI) removal capability and facial separation of CD-FeS attained its prominent potential application as an effective material for the Cr(VI) removal.
在这项研究中，通过一步简便策略合成了 β-环糊精（CD）修饰的 FeS 纳米材料，并研究了其对 Cr(VI)的去除。与裸 FeS 相比，CD-FeS 对 Cr(VI)具有更高的去除效率，当 CD 与 FeS 的摩尔比为 0.2 时，其最大容量为 220.26 mg·g。在有氧条件下和宽 pH 值范围的水溶液中，CD-FeS 对 Cr(VI)的有效性能能很好地保持。在共存阳离子和阴离子存在的情况下，对 Cr(VI)表现出高选择性。更重要的是，通过单一的 CD-FeS 处理步骤，可将实际电镀废水中的铬有效去除至 0.004 mg·L 的检测限，远低于世界卫生组织对 Cr(VI)的限制(<0.05 mg·L)，同时在 pH 值为 7 的条件下无需调节废水，通过快速磁分离即可达到。CD-FeS 有效去除 Cr(VI)涉及表面吸附/还原、溶液均相还原以及随后对 Cr(III)的螯合等复杂过程，从而有效去除水溶液中的总 Cr。CD-FeS 具有优异的 Cr(VI)去除能力和易于分离的特性，使其作为一种有效的 Cr(VI)去除材料具有突出的潜在应用前景。
