摘要
以三氯化锑(SbCl3)、硫粉(S)和硼氢化钠(NaBH4)为原料,1,2-丙二醇(C3H8O2)作溶剂,用回流法成功合成了Sb2S3纳米棒.用XRD,EDS,SEM,TEM,HRTEM,SAED以及UV-Vis等手段对所制备产品的晶型、成分、形貌和光学特性进行了表征;以太阳光为光源、亚甲基蓝为目标降解物评价了Sb2S3纳米棒的光催化活性.结果表明,经186℃回流15h可得到直径约为78～180nm、长度达2～5μm的正交晶系的Sb2S3单晶纳米棒.经计算,其晶胞参数a=1.124nm,b=1.138nm,c=0.384nm.UV-Vis分析表明,Sb2S3纳米棒为半导体材料,其带隙能量为1.52eV.光催化性能测试表明,所制备的Sb2S3纳米棒在太阳光下对亚甲基蓝具有较高的光催化降解率,经20min降解,亚甲基蓝的降解率达84.31%,表现出明显的可见光活性.加入的聚乙烯吡咯烷酮(PVP)对控制Sb2S3的形貌有重要的作用.另外,还讨论了Sb2S3纳米棒可能的形成机理.
Antimony trisulfide （Sb2S3） nanorods were successfully synthesized via refluxing method,using antimony trichloride （SbCl3）,sulfur powders （S） and sodium borohydride （NaBH4） as starting materials,1,2-propanediol as solvent.The phase,morphologies,compositions and optical properties of the products were investigated by XRD,EDS,SEM,TEM,HRTEM,SAED and UV-Vis techniques.The sunlight was used as light source to investigate the photocatalytic activity of Sb2S3 nanorods for the degradation of methylene blue.The results show that the Sb2S3 nanorods with a single crystal structure can be obtained under refluxing at 186 ℃ for 15 h.The nanorods are typically 78～180 nm in diameter and 2～5 μm in length,and are orthorhombic phase with calculated cell parameters of a=1.124 nm,b=1.138 nm and c=0.384 nm.UV-Vis analysis exhibits that Sb2S3 nanorods are a semiconductor with bandwidth Eg=1.52 eV.Photocatalytic tests show that the as-prepared Sb2S3 nanorods have high photocatalytic degradation rate for methylene blue under sunlight,and the photocatalytic degradation rate of methylene blue is up to 84.31% after 20 min degradation,exhibiting obvious visible-light activity.Polyvinyl pyrrolidone （PVP） plays an important role in controlling the morphology of Sb2S3.In addition,the possible growth mechanism of Sb2S3 nanorods was also discussed.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2010年第21期2199-2205,共7页
Acta Chimica Sinica
基金
国家自然科学基金(No.20673092)
湖南省教育厅科学研究(No.06C829)资助项目
关键词
硫化锑
回流法
纳米棒
光催化
antimony trisulfide
refluxing method
nanorod
photocatalysis
