| Ag-AgI/CN/MA复合物的制备及其可见光催化性能 |
| 摘要点击 1484 全文点击 578 投稿时间：2017-03-07 修订日期：2017-04-25 |
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| 中文关键词 Ag-AgI/CN/MA 光催化剂 可见光 染料 光降解 |
| 英文关键词 Ag-AgI/CN/MA photocatalysts visible light dyes photodegradation |
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| 中文摘要 |
| 采用沉淀法和热聚合法分别将AgI、氮化碳（CN）负载在介孔γ-Al2O3（MA）上，并通过光还原银离子成功制备了等离子体诱导可见光催化剂Ag-AgI/CN/MA.利用X射线衍射（XRD）、X射线光电子能谱（XPS）、场发射扫描电子显微镜（FESEM）、紫外可见漫反射光谱（UV-vis DRS）和透射电子显微镜（TEM）对Ag-AgI/CN/MA复合材料进行表征，并对其在可见光照射下（λ>420 nm）的光催化性能进行了研究，考察了初始溶液pH值及催化剂投加量等条件对光催化反应的影响.结果表明，表面银以Ag+和Ag0形式共存，并且Ag和AgI均匀地分散在CN的表面.与CN和Ag-AgI/MA相比，Ag-AgI/CN/MA复合物对甲基橙（MO）具有更高的可见光催化降解效率，且反应过程中Ag+的释放量显著减少，显示出良好的稳定性.当溶液pH值为7、催化剂投加量为1 g·L-1时，Ag-AgI/CN/MA-2显示出最优的催化性能.同时，其对罗丹明B（RhB）、甲基红（MR）和刚果红（CR）等不同电性的染料均体现出良好的催化性能. |
| 英文摘要 |
| Ag-AgI/CN/MA photocatalysts were prepared by coupling graphitic carbon nitride (CN) with AgI/γ-Al2O3(AgI/MA) through a thermal polymerization method and Ag nanoparticles were deposited by photoreduction. The catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), UV-vis diffuse reflectance spectra (UV-vis DRS), and transmission electron microscopy (TEM). The photocatalytic performance of different catalysts was evaluated under visible light irradiation (λ>420 nm). The effects of different conditions such as pH and catalyst dosage on photoreactions were also investigated. The results showed that Ag+ and Ag0 coexisted on the surface of the catalyst and Ag and AgI nanoparticles were uniformly distributed on the surface of CN. Compared with CN and Ag-AgI/MA, Ag-AgI/CN/MA composites exhibited better visible-light photocatalytic activity and stability, and the release of silver ions was significantly suppressed. At the catalyst dosage of 1 g·L-1 and pH=7, Ag-AgI/CN/MA-2 exhibited the optimal photocatalytic performance. Ag-AgI/CN/MA-2 also showed high photoactivity for the degradation of dyes with different charges, such as rhodamine B (RhB), methyl red (MR) and congo red (CR). |
