This study aims to develop the graphene oxide-based metal sulphide nanocomposite, which has outstanding photocatalytic properties. The graphene oxide (GO) was prepared by the Hummers method, and GO/nickel sulphide (GO/NiS) nanocomposite was synthesized by the hydrothermal method to evaluate the photocatalytic dye degradation. The synthesized nanocomposites were characterized by X-ray diffraction, Fourier transform infrared, ultraviolet–visible, scanning electron microscopy with energy-dispersive X-ray and transmission electron microscopy techniques. Photocatalytic dye degradation efficiency of GO, NiS and GO/NiS nanocomposites were evaluated by using crystal violet (CV) dye. The GO/NiS nanocomposite exhibited good photocatalytic activity as compared to NiS as well as GO. The optimum condition obtained for the effective photocatalytic degradation of CV is pH = 8.0, crystal violet = 2.0 × 10 −5 M, nanocomposite = 0.30 g. The rate of degradation of CV with the composite was found to be 2.39 × 10 −4 s −1 .

中文翻译：

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使用氧化石墨烯/硫化镍纳米复合材料有效光催化降解结晶紫

本研究旨在开发具有优异光催化性能的氧化石墨烯基金属硫化物纳米复合材料。通过 Hummers 法制备氧化石墨烯 (GO)，并通过水热法合成 GO/硫化镍 (GO/NiS) 纳米复合材料以评估光催化染料降解。合成的纳米复合材料通过 X 射线衍射、傅里叶变换红外、紫外-可见光、扫描电子显微镜、能量色散 X 射线和透射电子显微镜技术进行表征。通过使用结晶紫 (CV) 染料评估了 GO、NiS 和 GO/NiS 纳米复合材料的光催化染料降解效率。与NiS和GO相比，GO/NiS纳米复合材料表现出良好的光催化活性。获得有效光催化降解 CV 的最佳条件是 pH = 8.0，结晶紫 = 2.0 × 10 -5 M，纳米复合材料 = 0.30 g。发现复合材料的CV降解率为2.39×10 -4 s -1 。