State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, and ‡Cyrus Tang Center for Sensor Materials and Application, Department of Materials Science and Engineering Zhejiang University , Hangzhou 310027 P. R. China.
ACS Appl Mater Interfaces. 2015 Jan 28;7(3):1795-803. doi: 10.1021/am5074722. Epub 2015 Jan 15.
Two dimensional (2-D) Ti3C2Tx nanosheets are obtained by etching bulk Ti3C2Tx powders in HF solution and delaminating ultrasonically, which exhibit excellent removal capacity for toxic Cr(VI) from water, due to their high surface area, well dispersibility, and reductivity. The Ti3C2Tx nanosheets delaminated by 10% HF solution present more efficient Cr(VI) removal performance with capacity of 250 mg g(-1), and the residual concentration of Cr(VI) in treated water is less than 5 ppb, far below the concentration (0.05 ppm) of Cr(VI) in the drinking water standard recommended by the World Health Organization. This kind of 2-D Ti3C2Tx nanosheet can not only remove Cr(VI) rapidly and effectively in one step from aqueous solution by reducing Cr(VI) to Cr(III) but also adsorb the reduced Cr(III) simultaneously. Furthermore, these reductive 2-D Ti3C2Tx nanosheets are generally explored to remove other oxidant agents, such as K3[Fe(CN)6], KMnO4, and NaAuCl4 solutions, by converting them to low oxidation states. These significantly expand the potential applications of 2-D Ti3C2Tx nanosheets in water treatment.
二维（2-D）Ti3C2Tx 纳米片通过在 HF 溶液中蚀刻大块 Ti3C2Tx 粉末并通过超声剥离获得，由于其高表面积、良好的分散性和还原性，对水中的有毒 Cr(VI)具有出色的去除能力。用 10%HF 溶液剥离的 Ti3C2Tx 纳米片具有更高的去除 Cr(VI)性能，容量为 250mg g(-1)，处理水中 Cr(VI)的残留浓度低于 5ppb，远低于世界卫生组织推荐的饮用水标准（0.05ppm）中 Cr(VI)的浓度。这种二维 Ti3C2Tx 纳米片不仅可以通过将 Cr(VI)还原为 Cr(III)一步从水溶液中快速有效地去除 Cr(VI)，还可以同时吸附还原的 Cr(III)。此外，这些还原的二维 Ti3C2Tx 纳米片通常被探索用于通过将其他氧化剂（如 K3[Fe(CN)6]、KMnO4 和 NaAuCl4 溶液）转化为低氧化态来去除。这些显著扩大了二维 Ti3C2Tx 纳米片在水处理中的潜在应用。
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