钨酸锌纳米棒的水热合成条件对其荧光及光催化性能的影响

以硝酸锌和钨酸钠为原料,采用前驱体一水热法制得了钨酸锌纳米棒.X射线衍射、透射电镜和扫描电镜等分析结果表明:所得产物为直径约20nm,长度约200nm的ZnWO4纳米棒.详细研究了水热温度和水热时间对纳米棒的形成、荧光发射强度以及对有机染料罗丹明B(maodamine B,RhB)光催化降解的影响.结果表明:水热温度为200℃,反应时间为16h得到的产品直径小,形貌均一,结晶度高且对RhB的光催化降解效率与商用光催化剂二氧化钛(P-25)接近.

INFLUENCE OF HYDROTHERMAL CONDITIONS ON THE LUMINESCENCE AND PHOTOCATALYTIC PROPERTIES OF ZINC TUNGSTATE NANORODS

Zinc tungstate (ZnWO4) nanorods were synthesized by a precipitate-hydrothermal process by using Zn(NO3)2 and Na2WO4 as the raw materials. X-ray diffraction, transmission electron microscope and scanning electron microscope characterizations show that the obtained products are homogeneous ZnWO4 nanorods with diameters of about 20 nm and lengths of about 200 nm. The fol-lowing was studied in detail: the influence of hydrothermal temperature and hydrothermal time on the formation mechanism of ZnWO4 nanorods, the intensity of the luminescence spectra, and the photocatalytie activity for the degradation of Rhodamine B (RhB)of ZnWO4 nanorods. The research showed that the synthesized products had small diameters, were well crystallized and were uniform in size at a temperature of 200℃ and reaction time of 16 h. Furthermore, the photocatalytic capability for the degradation of RhB of ZnWO4 nanorods is close to the commercial photoeatalyst P-25(Degussa).