Enhanced photoelectrocatalytic performance for degradation of diclofenac and mechanism with TiO2 nano-particles decorated TiO2 nano-tubes arrays photoelectrode
Enhanced photoelectrocatalytic performance for degradation of diclofenac and mechanism with TiO2 nano-particles decorated TiO2 nano-tubes arrays photoelectrode
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DOI：
10.1016/j.electacta.2013.06.110
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发表时间：
2013-10
影响因子：
6.6
通讯作者：
Xiuwen Cheng;Huiling Liu;Qinghua Chen;Junjing Li;Pu Wang
中科院分区：
文献类型：
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作者：
Xiuwen Cheng;Huiling Liu;Qinghua Chen;Junjing Li;Pu Wang
本研究通过阳极氧化结合超声策略，并进行退火后处理，成功制备了TiO2纳米粒子装饰的TiO2纳米管阵列（TiO2NPs/TiO2NTAs）光电极。通过扫描电子显微镜（SEM）、N2吸附/解吸等温线、X射线衍射（XRD）和紫外-可见光漫反射光谱（DRS）对所制备的TiO2NPs/TiO2NTAs光电极的形貌和结构进行了表征。此外，使用对苯二甲酸（TA）作为探针分子，通过光致发光（PL）光谱检测羟基自由基（自由基dotOH）的产生。此外，通过瞬态开路电位（OCP）、光电流响应（PCR）和电化学阻抗谱（EIS）研究了TiO2NPs/TiO2NTAs光阳极的光电化学（PECH）性能。结果发现，TiO2NPs/TiO2NTAs 光电极的 OCP 显着降低 -0.219 mV cm−2，PCR 显着降低 0.049 mA cm−2，同时双氯芬酸的降解光电催化 (PEC) 效率显着提高 63.6% (0.4 Vvs.SCE)。此外，还提出了TiO2NPs/TiO2NTAs光阳极的增强PEC机制。高PEC性能可归因于TiO2NPs的修饰，它可以提高光生载流子在外部电势下的迁移率和分离效率。
In this study, TiO2nano-particles decorated TiO2nano-tubes arrays (TiO2NPs/TiO2NTAs) photoelectrodes have been successfully prepared through anodization, combined with ultrasonic strategy, followed by annealing post-treatment. The morphology and structure of the as-prepared TiO2NPs/TiO2NTAs photoelectrodes were characterized by scanning electrons microscopy (SEM), N2adsorption/desorption isotherms, X-ray diffraction (XRD) and UV–visible light diffuse reflection spectroscopy (DRS). In addition, the generation of hydroxyl radicals (radical dotOH) was detected by a photoluminescence (PL) spectra using terephthalic acid (TA) as a probe molecule. Furthermore, the photoelectrochemical (PECH) properties of TiO2NPs/TiO2NTAs photoanode were investigated through transient open circuit potential (OCP), photocurrent response (PCR) and electrochemical impedance spectroscopy (EIS). It was found that TiO2NPs/TiO2NTAs photoelectrode exhibited a distinct decrease of OCP of −0.219 mV cm−2and PCR of 0.049 mA cm−2, while a significantly enhanced photoelectrocatalytic (PEC) efficiency of 63.6% (0.4 Vvs.SCE) for the degradation of diclofenac. Moreover, the enhanced PEC mechanism of TiO2NPs/TiO2NTAs photoanode was proposed. The high PEC performance could be attributed to the decoration of TiO2NPs, which could improve the mobility and separation efficiency of photoinduced charge carriers under external potential.