摘要
以共沉淀法制备的纳米Fe3O4为核,以正硅酸乙酯为硅源,通过溶胶-凝胶法制备了SiO2@Fe3O4壳-核结构纳米颗粒,再以钛酸四丁酯为钛源,通过溶胶-凝胶法、经焙烧制得TiO2/SiO2@γ-Fe2O3磁性纳米光催化剂。采用X射线衍射仪、透射电子显微镜、比表面分析仪、振动磁强计对光催化剂的结构进行了表征,以苯酚溶液为模拟废水对光催化剂的光催化性能进行了评价。实验结果表明:经500℃焙烧的光催化剂活性相为锐钛矿型TiO2;在苯酚溶液初始浓度为0.2mmol/L、苯酚溶液pH为7的条件下,COD去除率为70.9%。
Using the nano Fe3O4 prepared by coprecipitation as core and tetraethoxysilane as silica source, the SiO2@ Fe3O4 particles with core-shell structure were prepared by sol-gel method. Then, using tetrabutyl titanate as Ti source, the TiO2/SiO2 @ γ-Fe2O3 magnetic nano photocatalyst was prepared by sol-gel method and calcination. The structure of the photocatalyst was characterized by XRD, TEM, BET and VSM, and its catalytic capability was evaluated using phenol solution as the simulated wastewater. The experimental results show that： The active phase of the photocatalyst calcined at 500 ℃ is the anatase TiO2 ; Under the conditions of initial phenol concentration 0.2 mmol/ L and solution pH 7, the COD removal rate can reach 70.9%.
出处
《化工环保》
CAS
CSCD
北大核心
2010年第5期450-453,共4页
Environmental Protection of Chemical Industry
关键词
磁性
壳-核结构
光催化剂
二氧化钛
氧化铁
苯酚
magnetic
core-shell structure
photocatalyst
titanium dioxide
ferric oxide
phenol
