Pyrite nanomaterials show an excellent performance in remediating Cr(VI) contaminated wastewater. However, the high surface reactivity makes them easy to agglomerate to reduce their removal efficiency for Cr(VI). In this study, a novel hexapod-like pyrite nanosheet clusters material was successfully synthesized via a facile hydrothermal method with the assistance of fluorides. The products were pyrite microspherulites without fluoride ion. The hexapod-like pyrite nanosheet clusters had dramatically higher Cr(VI) removal efficiencies than microspherulites due to more dissolved Fe(II) and S(-II) into the suspension released for nanosheet clusters should be responsible for the enhanced removal rate of Cr(VI). The XPS analysis revealed that the rapid adsorption on the surface of pyrite nanosheet clusters followed by reduction of Cr(VI) to Cr(III) by FeS₂ and subsequent precipitation of Cr(III) hydroxides/oxyhydroxides are responsible for the high removal capacity of Cr(VI). The hexapod-like pyrite nanosheet clusters material had high stability and longevity, and did not aggregate during the Cr(VI) removal process. The removal efficiency of Cr(VI) was still 100% after 5 cycles. Our study shows that the hexapod-like pyrite nanosheet clusters material could be acted as a recyclable and promising mineral material with high activity, stability, feasibility for remediating Cr(VI) contaminated environment.

黄铁矿纳米材料在修复 Cr(VI) 污染废水方面表现出优异的性能。然而，高表面反应性使它们容易团聚，从而降低它们对 Cr(VI) 的去除效率。在这项研究中，在氟化物的帮助下，通过简便的水热法成功合成了一种新型六足类黄铁矿纳米片簇材料。产物为不含氟离子的黄铁矿微球晶。由于更多溶解的 Fe(II) 和 S(-II) 进入纳米片簇释放的悬浮液中，六足状黄铁矿纳米片簇具有比微球晶更高的 Cr(VI) 去除效率，这应该是提高 Cr 去除率的原因（六）。₂和随后 Cr(III) 氢氧化物/羟基氧化物的沉淀是 Cr(VI) 高去除能力的原因。六足状黄铁矿纳米片簇材料具有很高的稳定性和寿命，并且在去除 Cr(VI) 过程中没有聚集。5 个循环后 Cr(VI) 的去除效率仍为 100%。我们的研究表明，六足状黄铁矿纳米片簇材料可以作为一种可回收的、有前途的矿物材料，具有高活性、稳定性和修复六价铬污染环境的可行性。