棉织物表面ZnO纳米棒的原位生长和掺杂改性

In-situ growth and doping modification of ZnO nanorods on cotton fabric

以硝酸锌和六亚甲基四胺为原料,聚乙二醇2000表面活性剂为形貌控制剂,采用低温水浴法,在棉织物表面实现稀土钕掺杂ZnO纳米棒阵列的原位生长;同时采用X射线衍射仪、扫描电子显微镜和紫外分光光度计等对制备的样品进行结构表征和性能分析。结果表明,当掺入物质的量之比为3%的钕时,可明显改善ZnO纳米棒表面状态,有利于产生更多的表面羟基,抑制光生电子和空穴的复合;Nd掺入ZnO晶格,增大了ZnO纳米棒的直径和比表面积,显著提高光催化活性和抗紫外线性能。表面生长有Nd/ZnO纳米棒阵列的棉织物,抗紫外线指数UPF值由掺杂前的360.9提升至471.5;在太阳光下照射8h,对亚甲基蓝溶液(MB)的降解率由掺杂前的56.3%跃升至87.6%。

Nd-doped ZnO nanorods are fabricated on the surface of cotton fabric using zinc nitrate, hexamethylenetetramine and polyethylene glycol 2000 by low-temperature hydrothermal process. The structure and morphology of as-prepared samples are characterized by XRD, SEM and UV-vis. The results show that ZnO nanorods doped with 3% （molar ratio）neodymium have far more hydroxy groups over the surface of the doped sample than the pure ZnO. It also indicates that the presence of 3% neodymium effectively suppressed the recombination of the photogenerated hole-electron pairs. With the incorporation of Nd into ZnO nanorods, the diameter and specific surface area of ZnO nanorods with remarkable photocatalys and UV-blocking property increased. The UPF of cotton fabric modified by ZnO nanorod can be increased from 360.9 to 471.5. Under visible light irradiation for 8 h, the photocatalysis degradation of MB can be increased from 56.3% to 87.6%.