Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China.
Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China.
J Colloid Interface Sci. 2018 Sep 15;526:470-479. doi: 10.1016/j.jcis.2018.04.106. Epub 2018 Apr 30.
A p-n heterojunction film of CuO/α-FeO was constructed by electrodepositing p-type CuO microcubes on liquid phase deposited film of n-type α-FeO. The surface morphology, the crystal phase and composition of CuO/α-FeO heterojunction film were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The enhanced absorption in the visible light region was observed in UV-visible diffuse reflectance spectra. Meanwhile, an efficiently improved separation and faster transfer of photogenerated electrons and holes were revealed by photoluminescence spectra and electrochemical impedance spectra. The CuO/α-FeO p-n heterojunction was applied to photoelectrocatalytic degradation of oxytetracycline at a bias potential of +0.5 V under visible light illumination. After 60-min photoelectrocatalytic treatment, 73.3% of oxytetracycline was removed and the degradation rate constant reached 2.14 × 10 min. Moreover, the crystal phases and compositions for the used and fresh CuO/α-FeO films were studied, and a possible photoelectrocatalytic mechanism was proposed.
通过在液相沉积的 n 型α-FeO 薄膜上电沉积 p 型 CuO 微立方体，构建了 CuO/α-FeO p-n 异质结薄膜。采用扫描电子显微镜、X 射线衍射和 X 射线光电子能谱对 CuO/α-FeO 异质结薄膜的表面形貌、晶体相和组成进行了表征。在紫外-可见漫反射光谱中观察到可见光区的增强吸收。同时，通过光致发光光谱和电化学阻抗谱揭示了有效的光生电子和空穴的分离和更快的转移。在可见光照射下，在偏压为+0.5 V 的条件下，将 CuO/α-FeO p-n 异质结应用于盐酸土霉素的光电催化降解。经过 60 分钟的光电催化处理，盐酸土霉素去除率达到 73.3%，降解速率常数达到 2.14×10-2 min-1。此外，还研究了用过和新鲜的 CuO/α-FeO 薄膜的晶体相和组成，并提出了一种可能的光电催化机制。
