Au-N共掺杂TiO_(2)纳米管电极的制备与表征

Preparation and characterization of Au-N co-doped TiO_(2) nanotube electrode

采用等离子体法和光化学沉积法制备出Au-N共掺杂TiO_(2)纳米管(Au-N-TNT)电极,并对其进行了扫描电镜(SEM)、X射线衍射(XRD)、紫外可见漫反射(UV-VIS-DRS)、循环伏安(CV)、和瞬态光电流(I-t)分析。以Au-N-TNT为工作电极,对四环素进行了光电催化降解研究。结果表明,Au-N-TNT管口处出现Au单质纳米颗粒,在紫外和可见光范围的光吸收率都明显增加,且在可见光范围吸收峰红移;循环伏安和光电流的结果表明共掺杂电极具有良好的导电性;光电流密度约为纯TNT的6倍。Au-N-TNT光电催化降解四环素反应过程符合一级反应动力学,0.2 mmol/L氯金酸掺杂条件下的光电催化降解速率最高,达到0.07744 min^(-1)。

Au-N co-doped TiO_(2) nanotubes(Au-N-TNT)electrodes are prepared by plasma and photochemical deposition methods.The properties of the co-doped electrode are characterized by scanning electron microscope(SEM),X-ray diffraction(XRD),UV-Vis diffuse reflectance spectroscopy(UV-VIS-DRS),cyclic voltammetry(CV)and transient photocurrent(I-t).The photoelectrocatalytic property of Au-N-TNT electrode for the degradation of tetracycline is investigated.The results show that Au elemental nanoparticles appear at the mouth of the Au-N-TNT.The light absorption rates in the ultraviolet and visible light ranges are significantly increased,and the absorption peaks in the visible light range are red-shifted.The results of cyclic voltammetry and photocurrent show that the co-doped electrode has good conductivity,and the photocurrent density is about 6 times that of pure TNT.The Au-N-TNT photoelectric catalytic degradation reaction process of tetracycline conforms to the first-order reaction kinetics.The photoelectric degradation rate under the doping condition of 0.2 mmol/L chloroauric acid is the highest,reaching 0.07744/min.