Cu-Bi纳米粉体的制备及其可见光光催化性能研究

Preparation and Visible-Light Photocatalytic Properties of Cu-Bi Nano-particle

以Cu(NO3)2、Bi(NO3)3、CO(NH)2为原料,聚乙二醇(PEG)为分散剂,采用均匀共沉淀法制备了Cu-Bi催化剂,用X-射线粉末衍射法、能量色散法、透射电镜和紫外-可见漫反射光谱法对催化剂的组成、粒径大小、表面形貌和光学吸收性能进行了详细表征,并以酸性大红和亚甲基蓝为目标降解物,考察了所制备的Cu-Bi催化剂在可见光下的光催化性能。实验结果表明,该催化剂为类球形纳米粉体,粒度均匀,粒径约50nm。在可见光作用下,该催化剂对酸性大红和亚甲基蓝均表现出良好的光催化性能,且在240min前,对酸性大红的降解率要优于亚甲基蓝;240min后则两者的降解效果相近。

Cu-Bi nano-particles were prepared by an improved homogeneous precipitation method, using the Cu（NO3）2·3H2O, Bi（NO3）3-5H2O and CO（NH2）2 as start materials and polyethylene glycol （PEG） as dispersant. Its structure and physicochemical properties were characterized by XRD, EDS, TEM and UV-Vis-DRS. The photocatalytic activity for degradation of methylene blue and acid Scarlet GR were investigated under visible-light irradiation. The results showed that the grain size distribution of Cu-Bi nanoparticles was within 50 nm. It exhibited a good photodegradation activity and the photodegradation rate of acid Scarlet GR and methylene blue. As for photodegradation rate, acid Scarlet GR is prior to methylene blue at the beginning, but after 240 min the results turned out to be similar.