摘要
以Bi(NO3)3·5H2O和NH4VO3为原料,采用微波水热法在200℃不同前驱液碱浓度下制备了BiVO4粉体。利用XRD、FE-SEM、BET、UV-Vis等手段研究了前驱液碱浓度对BiVO4晶型、结构及形貌的影响,并对不同前驱液碱浓度下合成粉体的光催化性能进行了研究。溶于纯水获得的粉体是单斜相和四方相1～3μm八面体结构的BiVO4混晶。溶于HNO3和NaOH溶液时制得粉体为纯单斜相3μm大小球状BiVO4,NaOH增加到4mol/L时为2μm大小鱼排骨状BiVO4的混晶。光催化结果表明,紫外光下光催化活性顺序为:BiVO4(纯水)>BiVO4(4mol/L NaOH)>BiVO4(2mol/L NaOH),可见光下光催化活性顺序为:BiVO4(4mol/L NaOH)>BiVO4(纯水)>BiVO4(2mol/L NaOH)。
Under different alkali concentrations of the precursor solution BiVO4 powers were synthesized by microwave-hydrothermal method at 200℃, using Bi（NO3）3·5H2O and N H4VO3 powders as raw materials. The phases, structures and morphologies of BiVO4 photoeatalysts were characterized respectively by XRD, FESEM, BET, and UV-Vis methods. The photocatalytic properties of the BiVO4 powders prepared under the dif-ferent alkali concentrations were also studied. The powder prepared under the precursor dissolved deionized wa- ter was BiVO4 mixed crystal with monoclinic phases and tetragonal phases with 1-3μm octahedral structure. When the precursor was dissolved into HNOa and NaOH solutions, the as-prepared powder was 3μm pure monoclinic ball-like BiVO4. When the concentration of NaOH was increased to 4mol/L, the powder became the mixed crystal with 2μm fishbone-like BiVO4. The results of photocatalytic activity show that the order of the photocatalytic activities under UV-light was BiVO4 （deionized water）〉BiVO4 （4mol/L NaOH）〉BiVO4 （2mol/L NaOH）. Under the visible-light irradiation, the order was BiVO4（4mol/L NaOH） 〉 BiVO4 （deionized water） 〉BiVO4 （2mol/L NaOH）.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2012年第6期756-759,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51172135)
国家青年科学基金资助项目(51002092)
陕西省自然科学基金资助项目(2010JM6013)
陕西科技大学研究生创新基金资助项目(SUST-A04)
关键词
微波水热法
BIVO4
光催化
晶相
碱浓度
microwave-hydrothermal method
BiV04
photocatalytic properties
crystalline structure
different al-kali concentration
