摘要
以Sm(NO_3)_3、NH_4H_2PO_4和Bi(NO_3)_3为原料,采用水热法合成了Sm^(3+)掺杂棒状BiPO_4光催化剂。采用XRD、SEM、UV-Vis吸收光谱、BET比表面积测试等手段对其组成、晶型、粒径、形貌及比表面积等进行了表征,并以金卤灯模拟可见光,以甲基橙和邻硝基苯酚为模型污染物,对其光催化性能进行了评价和分析。XRD和SEM分析表明,Sm^(3+)掺杂进入BiPO_4的晶格,导致其晶胞参数发生变化,但对其物相结构和形貌的影响不明显;UV-Vis吸收光谱测试表明,Sm^(3+)掺杂使BiPO_4在紫外光区的吸收减弱,可见光区略有增强。光催化实验表明,Sm^(3+)掺杂后BiPO_4的光催化活性与掺杂量密切相关,当Sm^(3+)掺杂量为0.75at%时光催化活性提高较显著。根据实验结果和文献报道,论文对Sm^(3+)掺杂后BiPO_4活性提高机理进行了探讨,认为Sm3+掺杂后BiPO_4光生电子-空穴分离效率提高是影响其活性的主要因素。
Using Sm(NO_3)_3, NH_4H_2PO_4 and Bi( NO_3)_3as raw material, Sm^(3+)doped BiPO_4 photocatalysts were synthesized by hydrothermal method. The phase composition, particle size,morphology and specific surface area of as-synthesized samples were characterized by XRD,SEM,UVVis-DRS and BET techniques. The photocatalytic activities of samples were evaluated by degradation of methyl orange and o-nitrophenol with metal halide as light source. XRD and SEM results show that Sm^(3+)doping makes BiPO_4 crystal lattice expansion. At the same time,no new phases are detected and Sm^(3+)doping can't have obviously influence on BiPO_4 crystal structure and morphology. UV-Vis-DRS analysis indicates that Sm^(3+)doping leads to BiPO_4 absorption intensity declining in the ultraviolet region and increasing slightly in the visible light region. Photocatalytic degradation of methyl orange and onitrophenol demonstrates the effects of Sm^(3+)doping on BiPO_4 Photocatalytic activity depend on the dopingamount,and when the doping amount come to 0. 75at%,BiPO_4 photocatalytic activity increases notely.Furthermore, BiPO_4 photoctalytic activity enhancement mechanism after Sm^(3+)doping was also investigated on the basis of experimental results and related literatures.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2015年第11期3172-3178,共7页
Journal of Synthetic Crystals
基金
陕西省科技厅工业攻关项目(2013K11-08
2013SZS20-P01)
陕西省社会发展科技攻关项目(2015SF291)
延安大学基金(2013YDZ-07
YDBK2013-11)
关键词
BiPO4
Sm3+掺杂
活性增强机理
BiPO_4
Sm^(3+)doping
photocatalytic activity enhancing mechanism
