LDO/CeO_2纳米复合材料的合成及性能研究

Synthesis and performance of LDO/CeO_2 nanocomposites

以水热法合成出的Mg-Al类水滑石为载体,用Ce(NO3)3·6H2O和HMT作原料,水热合成出LDO/CeO2纳米复合材料,并采用傅里叶变换红外光谱(FT-IR)、X射线衍射仪(XRD)和冷场发射扫描电子显微镜(FE-SEM)对样品结构和形貌进行了表征。此外,以H2O2为氧化剂,研究了该复合材料对罗丹明B模拟废水的催化氧化性能,结果表明,相同条件下制备出的LDO/CeO2纳米复合材料比纯CeO2具有更高的催化活性;当CeO2的负载量为50%,LDO/CeO2的投加量为0.2g时,罗丹明B模拟废水的降解接近完全,且催化剂重复使用5次后,脱色率仍保持85%以上。

Mg-A1 hydrotalcite was synthesized by a hydrothermal method. By using layered double hydrotalcite （LDH） as the support and Ce（NO3 ）3 · 6H2O and hexamethylenetetramine （HMT） as raw materials, LDO/CeO2 nanocomposites were prepared hydrothermally. The structure and morphology of the obtained samples were characterized by fourier transform--infrared spectroscopy （FT-IR）, X-ray diffraction （XRD） and field-emission scanning electron microscopy （FE-SEM）. In addition, the catalytic performance of LDO/CeO2 on oxidation of rhodamine B wastewater was investigated in the presence of oxidant H2 O2. The results showed that LDO/CeO2 nanocomposites exhibited better catalytic activity than pure CeO2 powder under the same synthetic conditions. When the loading amount of CeO2 was 50% and the dosage of LDO/CeO2 was 0. 2g, almost all rhodamine B wastewater was degraded. Moreover, more than 85% of dyes could still be degraded for the catalyst reused for 5 times.