氧化锌插层蒙脱土纳米复合材料的制备及其光催化活性

摘要

Herein,we report a facile synthesis of ZnO/montmorillonite (MMT)nanocomposites.The layered structures of MMT was firstly expanded and partly exfoliated into ultrathin few layer structures by fully hydrating and freezing and then ZnO nanoparticles (NPs)were embedded into the layers by a controllable hydrolysis process.The results indicated that ZnO NPs (1-3 nm in diameter)were intercalated in the layers of MMT or (10-25 nm in dia-meter)anchored on the surface of MMT.The nanocomposites was found to have an excellent performance for the deg-radation of methyl orange (MO),which inferred a potential application as a novel photocatalyst.Analysis showed the interlayer charge of the intercalated nanostructure can significantly inhibit the electron-hole recombination in photoca-talysis process.The enhanced photocatalytic activity of ZnO/MMT nanocomposites could be ascribed to the synergis-tic effect of the MMT loaded with nano-ZnO.%采用一种简便的方法制备了氧化锌插层蒙脱土纳米复合材料。首先将蒙脱土充分充水后进行冷冻，具有层状结构的蒙脱土充水后会发生膨胀，部分从块状的蒙脱土上剥离形成超薄的片层结构。然后通过可控的水热过程使氧化锌纳米粒子进入蒙脱土层间或覆盖于表面。结果表明，直径1~3 nm 的纳米氧化锌会插层于蒙脱土的层间，而直径达10~25 nm的纳米氧化锌则会镶嵌在蒙脱土表面。该纳米复合材料对模拟污染物甲基橙具有优异的光催化性能。