Herein, ZnCr layered double hydroxide (ZnCr LDH), and its nanocomposites with GO and rGO were synthesized using the co-precipitation method. The samples were characterized using XRD, FT-IR, SEM, TEM, BET, and XPS techniques. The sonophotocatalytic activity of the ZnCr LDH, ZnCr LDH/GO, and ZnCr LDH/rGO was investigated via the degradation of rifampicin (RIF) in the ultrasonic bath under visible light irradiation. The synergy index of more than 1 determined for ZnCr LDH/rGO indicated the positive interaction of sonocatalysis and photocatalysis resulted by hybridizing the LDH nanosheets with rGO. The maximum sonophotocatalytic degradation efficiency of 87.3% was achieved in the presence of ZnCr LDH/rGO nanocomposite with the concentration of 1.5 g L⁻¹ for degradation of RIF with an initial concentration of 15 mg L⁻¹ within 60 min sonication under visible light irradiation. The addition of different scavengers indicated that hydroxyl radicals, superoxide anion radicals, and the generated holes played a dominant role in the degradation of the pollutant molecules. A possible degradation mechanism was suggested based on the intermediates. The antibacterial tests confirmed the higher antibacterial activity of ZnCr LDH/GO compared with ZnCr LDH and ZnCr LDH/rGO against Gram-positive Staphylococcus aureus.

本文采用共沉淀法合成了 ZnCr 层状双氢氧化物 (ZnCr LDH) 及其与 GO 和 rGO 的纳米复合材料。使用 XRD、FT-IR、SEM、TEM、BET 和 XPS 技术对样品进行表征。通过在超声波浴中在可见光照射下降解利福平 (RIF)，研究了 ZnCr LDH、ZnCr LDH/GO 和 ZnCr LDH/rGO 的声光催化活性。ZnCr LDH/rGO 的协同指数大于 1，表明 LDH 纳米片与 rGO 杂交产生了声催化和光催化的正相互作用。在浓度为 1.5 g L ^-1的 ZnCr LDH/rGO 纳米复合材料存在下，声光催化降解效率最高可达 87.3%用于在可见光照射下超声处理 60 分钟内降解初始浓度为 15 mg L ^-1的 RIF 。不同清除剂的加入表明羟基自由基、超氧阴离子自由基和产生的空穴在污染物分子的降解中起主导作用。基于中间体提出了可能的降解机制。抗菌试验证实，与 ZnCr LDH 和 ZnCr LDH/rGO 相比，ZnCr LDH/GO 对革兰氏阳性葡萄球菌具有更高的抗菌活性。