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首页> 外文期刊>Catalysis science & technology >Preparation of graphene/TiO2 nanotube array photoelectrodes and their photocatalytic activity for the degradation of alachlor
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Preparation of graphene/TiO2 nanotube array photoelectrodes and their photocatalytic activity for the degradation of alachlor

机译：制备石墨烯/二氧化钛纳米管阵列光电极及其光催化活性草不绿的退化

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摘要

Graphene/TiO2 nanotube array (GR/TNA) photoelectrodes were fabricated by combining in situ anodization and an electro-deposition process. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-vis diffuse reflectance spectra (DRS), photopotential measurement, electrochemical impedance spectroscopy (EIS) and zeta-potential measurement were employed to characterize the as-prepared samples. The photocatalytic properties of the GR/TNA photoelectrodes were investigated using the degradation of alachlor as a model reaction. The introduction of GR had no obvious effect on the original crystallization of the TNAs, whereas the photoelectric property was significantly improved. The GR/TNA photoelectrodes exhibited higher photocatalytic activity for alachlor degradation than the bare TNA photoelectrodes. The degradation efficiency of alachlor by the GR/TNA photoelectrodes gradually decreased with the increase of initial alachlor concentration, initial pH and distance from illuminant. Some interfering anions (e.g. NO3- and SO42-) could improve the photocatalysis efficiency, whereas Cl(-)exhibited a slight inhibition effect on the alachlor degradation. Additionally, GR/TNA photoelectrodes possessed superb stability for maintaining a high alachlor degradation efficiency at more than 99.5% after 15 times of successive use with 60 min irradiation for each cycle.
机译：石墨烯/二氧化钛纳米管阵列(GR / TNA)光电极被结合在捏造原地阳极化和电泳的过程。x射线衍射(XRD)、傅里叶变换红外光谱(FTIR),紫外可见漫反射反射光谱(DRS) photopotential测量、电化学阻抗光谱法(EIS)和电动电位测量是用来描述好了吗样本。使用GR / TNA光电极进行调查草不绿作为模型的降解反应。GR的引入没有明显的影响的原始结晶TNAs,而光电性质明显改善。更高的光催化活性草不绿比裸TNA光电极的降解。草不绿的降解效率GR / TNA光电极逐渐减少最初的草不绿浓度的增加,初始pH值和距离光源。干扰离子(例如NO3 -、SO42 -)提高光催化效率,而Cl(-)表现出轻微的抑制影响草不绿退化。光电极具有极好的稳定性维持一个高草不绿退化15次后效率在99.5%以上连续使用60分钟照射周期。

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