钕负载二氧化钛-炭杂化气凝胶的制备及其光催化性能

Nd-doped TiO2-C hybrid aerogels and their photocatalytic properties

    摘要
  • 摘要: 采用溶胶凝胶法和浸渍法制备了不同钕掺量负载的二氧化钛/炭（TiO2-C）杂化气凝胶。通过XRD，SEM，FTIR，XPS及氮气吸附脱附等温线表征了样品的微观结构、形貌及表面元素状态。在500 W汞灯照射下，以亚甲基蓝为目标降解物，研究了样品的光催化活性。结果表明，所制样品为不规则颗粒，钕的掺杂抑制了TiO2颗粒的生长，TiO2为锐钛矿型且炭呈现不定型态，同时Nd3+进入TiO2内形成Ti-O-Nd键。在紫外光波段，样品具有较强的吸收性能，表现出紫外光照下对亚甲基蓝良好的光催化性能。当钕的负载量为3%-4%时，样品具有最佳的光催化活性，此时亚甲基蓝在紫外光照160 min后被完全降解。

     

    Abstract: Nd-doped TiO2-C hybrid aerogels with different Nd doping levels were prepared by a combined sol-gel and impregnation method. The microstructure, morphology and photocatalytic activities of the samples were investigated by XRD, SEM, FTIR, XPS, nitrogen adsorption and the photocatalytic degradation of methylene blue (MB) under UV irradiation. Results showed that the samples are composed of irregular-shaped nanoparticles and the Nd dopant inhibits their growth. The TiO2 in the samples is anatase, the carbon is amorphous and Nd3+ is in a Ti-O-Nd bond form. The samples had strong absorption in the ultraviolet region and exhibited good degradation activity for MB in aqueous solutions under UV light. The best activity was achieved when the ratio of Nd to Ti is 3-4 wt%, in which case MB was completely degraded under UV irradiation for 160 min.

     

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