| 纳米Ag@AgBr表面敏化K2Ti4O9可见光催化剂的微波合成、表征和光催化活性 |
| Nano Ag@AgBr Surface-Sensitized K2Ti4O9 Visible-Light Photocatalyst: Microwave Synthesis, Characterization and Photocatalytic Activity |
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| 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-Vis Diffuse Reflectance)、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0.2~0.5 μm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1 h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。 |
| 关键词: Ag@AgBr/K2Ti4O9 微波 光催化: 纳米复合材料: 降解 |
| 基金项目: 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。 |
| Abstract: 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 (RhB) 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@AgBr affects the absorption spectra. The composite photocatalyst loaded with 25wt% Ag@AgBr shows the highest photocatalytic activity. 97% RhB 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. |
| Keywords: Ag@AgBr/K2Ti4O9 microwave photocatalysis nanocomposites degradation |
| 投稿时间：2014-06-29 修订日期：2014-08-22 |
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| 梁英华,林双龙,刘利,胡金山,崔文权.纳米Ag@AgBr表面敏化K2Ti4O9可见光催化剂的微波合成、表征和光催化活性[J].无机化学学报,2014,30(11):2675-2683. |
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