不同碱源对Sm（OH）3纳米晶的结构和光催化性能的影响

以Sm(NO3)3·6H2O、氨水、NaOH、乙二胺和二乙烯三胺为主要原料,蒸馏水为溶剂,在水浴条件下分别制得了颗粒状和棒状结构的Sm(OH)3纳米晶.采用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)和Lambda 950分光光度计分别对产物的物相、形貌和光学性能进行表征,研究了不同碱源对Sm(OH)3纳米晶的结构和光催化性能的影响.结果表明:水浴条件下,弱碱氨水不利于Sm(OH)3纳米晶的结晶生长过程的进行,所得产物呈现非晶颗粒的团聚体;在强碱乙二胺和二乙烯三胺作用下得到了结晶性良好的棒状结构的产物,且棒的长径比的增大有益于产物光催化性能的提高.

Influence of different alkaline agents on the structure and photocatalytic activity of Sm（OH）3 nanocrystallites

Sm（OH）3 nanocrystaIlites with particle and rodlike morphology were synthesized by using Sm （NO3）3 · 6H2O,NH3 · H2O, NaOH, ethanediamine and diethylenetriamine as main raw materials and distilled water as solvent in water bath. The phase composition,morphologies and optical performances of the as-prepared samples were characterized by XRD （X-ray diffractometer）, SEM （scanning electron microscope） and Lambda 950 spectrophotometer and the influence of different alkaline agents on the structure and photocatalytic activity of the products were investigated. Results show that NH3 · H2O is negative for the crystallized process of Sm（OH）3 nanocrystallites under the condition of water bath. Well crystallized hexagonal Sm（OH）3 nanocrystallites with rodlike morphology were prepared by using ethanediamine and diethylenetriamine as alkaline agents. Moreover the increase of the aspect ratio of the nanorods is good for improving the photocatalytic activities of the Sm （OH）s nanocrystallites.