Abstract Photocatalytic decomposition of methylene blue (BM) solution by Cu-doped ZnS nanoparticles in the presence of UV light has been studied. The effect of the molar ratio of Cu ions affecting the rate of degradation reaction has been investigated. Photocatalytic reactivity of ZnS:Cu nanoparticles could be tailored by the proper amount of Cu ions. The maximum decolorizing efficiency (85%) of 5 ppm MB was obtained by 30 mgL−1 nanoparticles containing 2 wt% Cu, which was ascribed to the most effective surface area of these particles. However, at more than 2 wt% Cu doping concentration, nanoparticles aggregated due to their high surface energy, and the decomposition efficiency was decreased.

中文翻译：

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不同化学计量比的ZnCuS纳米颗粒催化去除亚甲基蓝

摘要 研究了在紫外光存在下，Cu 掺杂的 ZnS 纳米颗粒对亚甲蓝 (BM) 溶液的光催化分解。已经研究了影响降解反应速率的Cu离子摩尔比的影响。ZnS:Cu 纳米粒子的光催化反应性可以通过适量的 Cu 离子来调整。通过含有 2 wt% Cu 的 30 mgL-1 纳米颗粒获得 5 ppm MB 的最大脱色效率 (85%)，这归因于这些颗粒的最有效表面积。然而，在超过 2 wt% 的 Cu 掺杂浓度下，纳米颗粒由于其高表面能而聚集，并且分解效率降低。