Zhang Sai, Zhang Li-Li, Hu Chun
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
Huan Jing Ke Xue. 2017 Oct 8;38(10):4245-4252. doi: 10.13227/j.hjkx.201703055.
Ag-AgI/CN/MA photocatalysts were prepared by coupling graphitic carbon nitride (CN) with AgI/-AlO(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 (>420 nm). The effects of different conditions such as pH and catalyst dosage on photoreactions were also investigated. The results showed that Ag and Ag 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 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).
通过热聚合方法将石墨相氮化碳（CN）与AgI/γ -Al₂O₃（AgI/MA）耦合制备Ag-AgI/CN/MA光催化剂，并通过光还原沉积Ag纳米颗粒。采用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）对催化剂进行表征。在可见光照射（>420 nm）下评估不同催化剂的光催化性能。还研究了pH值和催化剂用量等不同条件对光反应的影响。结果表明，Ag⁰和Ag⁺共存于催化剂表面，且Ag⁰和AgI纳米颗粒均匀分布在CN表面。与CN和Ag-AgI/MA相比，Ag-AgI/CN/MA复合材料表现出更好的可见光光催化活性和稳定性，且银离子的释放得到显著抑制。在催化剂用量为1 g·L⁻¹且pH = 7时，Ag-AgI/CN/MA-2表现出最佳的光催化性能。Ag-AgI/CN/MA-2对不同电荷的染料，如罗丹明B（RhB）、甲基红（MR）和刚果红（CR）的降解也表现出高光活性。
