摘要
利用微波法合成纳米尺寸Ag@AgBr表面敏化K2Ti4O9的复合光催化剂（Ag@AgBr/K2Ti4O9）,并通过SEM、X-射线能量色散谱（EDX）、TEM、选定区域电子衍射（SAED）、XRD、紫外-可见漫反射（UV-VisDiffuseReflectance）、XPS等对其进行了表征,同时在可见光下测定催化剂对有机物降解的光催化活性。结果表明,粒径为0.2~0.5μm的Ag@AgBr均匀分散在K2Ti4O9表面,Ag@AgBr/K2Ti4O9对可见光有很好的吸收且Ag@AgBr的担载量影响可见光的吸收。当Ag@AgBr的担载量为25wt%时,复合光催化剂具有最高的光催化活性,光照1h对罗丹明B（RhB）的降解率可达97%。另外,催化剂的担载量和稳定性也做了考察。催化剂较高的光催化活性主要归因于Ag纳米粒子的表面等离子体效应和有效的光生电子-空穴的分离。
Nano-sized Ag@AgBr surface-sensitized K2Ti4O9 composite photocatalysts（Ag@AgBr/K2Ti4O9） was synthesized via a microwave method and characterized by SEM, Energy dispersive X-ray spectroscopy（EDX）,TEM, selected area electron diffraction（SAED）, XRD, UV-Vis diffuse reflectance spectroscopy and XPS. The photocatalytic property for the degradation of Rhodamine B（Rh B） dye pollutants was evaluated under visible light irradiation. The results indicate that the particles of Ag@AgBr/K2Ti4O9 distribute in the range of 200 ~500 nm.Ag@AgBr/K2Ti4O9 samples exhibit superior absorption for visible light and the loading amount of Ag@Ag Br affects the absorption spectra. The composite photocatalyst loaded with 25wt% Ag@AgBr shows the highest photocatalytic activity. 97% Rh B is degraded after irradiation for 1 h. The loading amount and stability were also investigated. The high photocatalytic activity can be attributed to the surface plasmon resonance effect of Ag Nanoparticles（NPs） and efficient photo-induced charge separation.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2014年第11期2675-2683,共9页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.51172063,51202056,51372068)
河北省杰出青年科学基金(No.B2014209304)
河北省自然科学钢铁联合研究基金(No.B2014209314)
河北省引进留学人员基金资助项目
