Sulfonated reduced graphene oxide (rGO-SO₃H, SRGO) was synthesized by introducing aryl diazonium salt of sulfanilic acid radicals onto chemically modified reduced graphene oxide (rGO) under sonication. SRGO catalyst was characterized by X-ray diffraction (XRD), Raman spectroscopy, solid state ¹³C MAS NMR (¹³C SSNMR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron spectroscopy (TEM), and X-ray photoelectron spectroscopy (XPS). SRGO was efficiently used as a reusable, metal-free, solid acid catalyst for the direct N-acetylation of amines with acetonitrile under sonication into the corresponding amides. Thus, the method could also serve as a novel convenient alternative for the other acetylation reactions under sonication to avoid using toxic substances such as acetic anhydride, acetyl chloride, and acetic acid.

磺化还原氧化石墨烯（rGO -SO ₃ H，SRGO）是通过在超声处理下将磺胺酸自由基的芳基重氮盐引入化学修饰的氧化还原石墨烯（rGO）上而合成的。SRGO催化剂的特征在于X射线衍射（XRD），拉曼光谱，固态¹³ C MAS NMR（¹³ C SSNMR），扫描电子显微镜（SEM），能量色散光谱（EDS），透射电子光谱（TEM）和X射线光电子能谱（XPS）。SRGO被有效地用作直接N的可重复使用，无金属的固体酸催化剂在超声处理下将胺与乙腈进行乙酰化反应生成相应的酰胺。因此，该方法还可以作为超声处理下其他乙酰化反应的新颖方便的替代方法，从而避免使用有毒物质，例如乙酸酐，乙酰氯和乙酸。