Nano-sized CuInS₂ was evenly anchored on the thin film of reduced graphene oxide (rGO/CuInS₂) by a simple one-step solvothermal method. The photocatalytic activity of rGO/CuInS₂ was much higher than that of pure CuInS₂, and was highly dependant on rGO amount with results revealing an optimal rGO content of 1 wt%. The 1% rGO/CuInS₂ composite demonstrated the highest visible-light photocatalytic activity with almost 90% 2-nitrophenol removal, which was almost two times of pure CuInS₂. The enhanced photocatalytic activity of rGO/CuInS₂ is ascribed to that the ultrathin film structure of rGO endows rGO/CuInS₂ composites with a large density of exposed active sites to reactants, short transport distances of photogenerated charges and the efficient separation of charge carriers. Of special significance is that 1% rGO/CuInS₂ composite can effectively treat real pharmaceutical wastewater with 86.5% chemical oxygen demand (COD) removal efficiency in 11 h. Moreover, there was no obvious decrease in the photocatalytic activity of rGO/CuInS₂ composites after four photocatalytic cycles. The high COD removal efficiency of pharmaceutical wastewater and reusability indicate the great potential of rGO/CuInS₂ in environmental purification of organic pollutants.

通过简单的一步溶剂热法将纳米尺寸的CuInS ₂均匀地锚固在还原的氧化石墨烯薄膜（rGO / CuInS ₂）上。rGO / CuInS ₂的光催化活性远高于纯CuInS ₂，并且高度依赖于rGO的量，结果表明最佳rGO含量为1 wt％。1％rGO / CuInS ₂复合材料显示出最高的可见光光催化活性，几乎去除了90％的2-硝基苯酚，这几乎是纯CuInS _2的两倍。rGO / CuInS ₂的增强的光催化活性归因于rGO的超薄膜结构赋予rGO / CuInS ₂具有高密度的暴露于反应物的活性位点，光生电荷的传输距离短以及电荷载体的有效分离的复合材料。特别重要的是，1％rGO / CuInS ₂复合材料可以在11 h内以86.5％的化学需氧量（COD）去除效率有效地处理制药废水。此外，经过四个光催化循环后，rGO / CuInS ₂复合材料的光催化活性没有明显降低。制药废水的高COD去除效率和可重复使用性表明rGO / CuInS ₂在有机污染物的环境净化方面具有巨大潜力。