W18O49@Cu2O纳微米复合材料的制备及其光催化性能研究

Preparation and photocatalytic performance of W18O49@Cu2Onano-/micro-structure composites

摘要:

本文首先用热蒸发方法制备得到了W₁₈O₄₉纳微米棒,然后经醋酸铜饱和溶液浸泡后再热处理的办法成功在W₁₈O₄₉纳微米棒表面负载Cu₂O制得得到了W₁₈O₄₉@Cu₂O纳微米复合材料；采用X-射线衍射仪、扫描电子显微镜、X-射线能谱分析及透射电子显微镜对样品进行分析表征；最后选用亚甲基蓝溶液作为目标降解物模拟污水处理测试材料的光催化性能。实验结果表明,W₁₈O₄₉纳微米棒在饱和醋酸铜溶液中浸泡时间越长,所得到的催化剂中Cu₂O的负载量越多,且所制备的W₁₈O₄₉@Cu₂O的纳微米复合材料相对于纯W₁₈O₄₉纳微米棒,其光催化效率得到了显著提高。

Abstract:

In this paper, W₁₈O₄₉ nano-/micro-structures (NMS) were first prepared by evaporating of WO₃ and elemental S powders, and then W₁₈O₄₉@Cu₂O NMS composite was successfully fabricated by dipping the prepared W₁₈O₄₉NMS in saturated cupric acetate solution and thereafter thermal treatment. The prepared W₁₈O₄₉NMS and the finally obtained W₁₈O₄₉@Cu₂O NMS composite were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy and transmission electron microscopy. Finally, the photocatalytic performances of the prepared W₁₈O₄₉NMS and the final W₁₈O₄₉@Cu₂O NMS composite were evaluated by the degradation of methylene blue under simulated sunlight irradiation. It was revealed that a longer dipping time would result in more Cu₂O loaded on the W₁₈O₄₉ NMS; and the loading of Cu₂O on W₁₈O₄₉ NMS can effectively improve its photocatalytic performance.