TiO2/g-C3N4复合粉体的制备及其在紫外/芬顿反应中光催化性能

本文通过静电吸附法制备了TiO₂/g-C₃N₄复合粉体。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)、紫外-可见漫反射光谱(UV-Vis DRS)等对其形貌、成分、光学性能进行表征。以罗丹明B为模拟污染物,表征其在紫外光条件下的光催化性能。结果表明:在降解罗丹明B实验中,当复合粉体中TiO₂负载量达到15%(质量分数)时,具有更明显的催化降解效果,在20 min内降解率可以达到99.40%。在加入异丙醇作为羟基自由基捕获剂后,降解率降到了27.30%,确定了反应的主要活性物质为羟基自由基。紫外辅助芬顿反应可以明显提高传统芬顿反应的效果,本文还对催化剂的反应机理进行了相应探索。

Preparation of TiO2/g-C3N4 Composite Powder and Its Photocatalytic Performance in UV/Fenton Reaction

In this paper, TiO₂/g-C₃N₄ composite powder was prepared by electrostatic adsorption method, and its morphology, composition and optical properties were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), UV-Vis diffuse reflectometry (UV-Vis DRS) and other characterization methods. Rhodamine B was used as a simulated pollutant to characterize its photocatalytic performance under UV light. The result show that: in the Rhodamine B degradation experiment, when the loading amount of TiO₂ reaches 15% (mass fraction), the composite powder has more obvious catalytic degradation effect, and the degradation efficiency can reach 99.40% within 20 min. After adding isopropanol as hydroxyl radical capture agent, the degradation rate decreases to 27.30%, and it is determined that the main active substance of the reaction is hydroxyl radical. Ultraviolet assisted Fenton reaction can obviously improve the effect of traditional Fenton reaction, and the reaction mechanism of catalyst was explored.