g-C3N4/Ag/TiO2 NTs的制备及其对西维因的光催化降解

采用阳极氧化法制备二氧化钛纳米管(TiO₂ NTs),然后在紫外光和微波辅助下引入Ag、g-C₃N₄制备出g-C₃N₄/Ag/TiO₂ NTs三元复合光催化材料。用扫描电镜(SEM)、X-射线衍射(XRD)、X-射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis)、光致发光(PL)等手段对g-C₃N₄/Ag/TiO₂ NTs进行表征,研究了这种材料对西维因的降解性能。结果表明,在模拟太阳光照射下,g-C₃N₄/Ag/TiO₂ NTs对西维因的降解率由TiO₂ NTs的29.1%提高到51.8%。光催化活性的提高,与Ag表面等离子体共振效应、Ag优异的电荷传导性以及g-C₃N₄与TiO₂ NTs界面的异质结有关。

Preparation of g-C3N4/Ag/TiO2 NTs and Photocatalytic Degradation of Ceftazidine

Titanium oxide nano-tubes (TiO₂ NTs) were firstly prepared by anodic oxidation method, and then Ag and carbonitride g-C₃N₄ were deposited onto TiO₂ NTs under the synergistic action of ultraviolet irradiation and microwave heating to prepare the ternary composite photocatalyst g-C₃N₄/Ag/TiO₂ NTs. Then the prepared composites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV Vis diffuse reflectance spectroscopy (UV-Vis) and photoluminescence spectroscopy (PL).The results show that the composite of g-C₃N₄/Ag/TiO₂ NTs presents a higher degradation rate of 51.8% for the carbaryl under the simulated sunlight, in the contrast, that of the simple TiO₂ NTs is 29.1% only. The improvement of photocatalytic activity is related to the combined effect of the surface plasmon resonance effect of Ag, the excellent charge conductivity of Ag and the formation of heterojunction between g-C₃N₄ and TiO₂ NTs.