花形ZnO纳米片微球的合成、表征及光催化性能

Synthesis,Characterization and Photocatalytic Activity for Flower-Like Microspheres of ZnO Nanosheets

以ZnCl2和尿素为原料,采用水热法合成了由纳米片组成的花形微球碱式碳酸锌前驱体,然后在300℃下煅烧0.5 h得到了形貌一致的ZnO产物。采用XRD、FTIR、TG、SEM、TEM、XPS对其进行表征,结果表明产物为六方纤维矿结构ZnO;组成3D花型微球的纳米片构筑单元厚度为10 nm,表面呈孔装结构,比表面积为72 m2.g-1。分别以花形ZnO纳米片、单分散ZnO纳米片和商用ZnO纳米颗粒为光催化剂,通过降解罗丹明B(Rh B)进行了光催化活性研究。结果表明,与商用ZnO纳米颗粒相比,水热法制备的花形ZnO纳米片显示了更好的光催化活性,可能是由于花形ZnO纳米片微球有较高的比表面积和3D花形形貌所致。

Zns（COa）2（OH）6 was prepared via the hydrothermal process by using ZnC12 and urea as raw materials and the corresponding ZnO nanosheets-eonstructed flower-like microspheres were obtained after calcination of the precursors at 300°C for 0.5 h. The hierarchical ZnO microarchiteeture was characterized by XRD, FTIR, TG, SEM, TEM and XPS. The results indicate that the product is hexagonal ZnO with wurtzite structure,and the thickness of ZnO nanosheets is 10 nm. ZnO mierospheres are monodispersed with uniform shape and high surface area. The hierarchical ZnO microarchitecture exhibits higher photocatalytic activity for decolorization of Rhodamine B under ultraviolet irradiation than that of commercial ZnO nanoparticles, which can be attributed to the larger surface area and the special 3D structural feature of the nanosheets.