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采用沉淀法和热聚合法分别将AgI、氮化碳(CN)负载在介孔γ-Al_2O_3(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(Rh B)、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.
AgI and CN (CN) were supported on mesoporous γ-Al 2 O 3 (MA) by precipitation and thermal polymerization respectively. The Ag-AgI / CN / MA catalyst was successfully prepared by photocatalytic reduction of silver ions The structure of Ag-AgI / Ag-Ag / Ag-Ag / Ag-Ag / Ag- CN / MA composites were characterized and their photocatalytic activities under visible light irradiation (λ> 420 nm) were investigated. The effects of initial solution pH and dosage of catalyst on the photocatalytic reaction were investigated. Results It is shown that the surface silver coexists in the form of Ag + and AgO, and Ag and AgI are uniformly dispersed on the surface of CN.Compared with CN and Ag-AgI / MA, Ag-AgI / CN / Has a higher catalytic efficiency of visible light degradation, and the release of Ag + significantly decreases during the reaction, showing good stability.When the solution pH is 7 and the catalyst dosage is 1 g · L -1, Ag-AgI / CN / MA-2 showed the best catalytic performance, and its different electrical properties such as rhodamine B, methyl red (MR) and congo red It is reflected in the good catalytic performance.