In the field of catalysis, the development of efficient and economical catalysts for the reduction of heavy metals such as Cr(VI) remains challenging. In this study, a series of CuCoOS nanomaterials were successfully prepared by a facile one-step method, and the morphological structures, elemental compositions, and optical properties of the catalysts were characterized in detail. The catalytic performance of each material was evaluated for reduction of a Cr(VI) solution in the dark without any other reagents. The CuCoOS catalyst exhibited excellent activity and completely reduced a 50 ppm Cr(VI) solution within 20 min. This activity could be mainly attributed to the large specific surface area of the prepared catalyst, which had many exposed active sites and defects. Synergy between the two metals (Cu and Co) also facilitated the catalytic reaction. The effects of the catalyst dose, concentration, and pH in the reduction system were studied systematically. Experiments performed by recycling the catalyst confirmed it had good stability and durability. Finally, a possible mechanism for Cr(VI) reduction is proposed.

中文翻译：

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一步制备双金属 CuCoOS 作为 Cr(VI) 还原的有效催化剂

在催化领域，开发高效、经济的催化剂来减少 Cr( VI )等重金属仍然具有挑战性。本研究通过简便的一步法成功制备了一系列CuCoOS纳米材料，并对催化剂的形貌结构、元素组成和光学性质进行了详细表征。在没有任何其他试剂的情况下，评估每种材料在黑暗中还原 Cr( VI ) 溶液的催化性能。CuCoOS 催化剂表现出优异的活性并完全减少了 50 ppm 的 Cr( VI) 20 分钟内解决。这种活性主要归因于所制备的催化剂具有较大的比表面积，具有许多暴露的活性位点和缺陷。两种金属（Cu 和 Co）之间的协同作用也促进了催化反应。系统地研究了催化剂用量、浓度和pH值对还原体系的影响。通过回收催化剂进行的实验证实它具有良好的稳定性和耐久性。最后，提出了一种可能的 Cr( VI ) 还原机制。