Zhang Huiqin, Ding Hongrui, Wang Xin, Zeng Cuiping, Lu Anhuai, Li Yan, Wang Changqiu
The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China.
Institutes of Science and Development, Chinese Academy of Sciences, Beijing 100190, China.
J Environ Sci (China). 2017 Feb;52:259-267. doi: 10.1016/j.jes.2016.04.009. Epub 2016 May 5.
Birnessite films on fluorine-doped tin oxide (FTO) coated glass were prepared by cathodic reduction of aqueous KMnO. The deposited birnessite films were characterized with X-ray diffraction, Raman spectroscopy, scanning electron microscopy and atomic force microscopy. The photoelectrochemical activity of birnessite films was investigated and a remarkable photocurrent in response to visible light was observed in the presence of phenol, resulting from localized manganese d-d transitions. Based on this result, the photoelectrocatalytic oxidation of phenol was investigated. Compared with phenol degradation by the electrochemical oxidation process or photocatalysis separately, a synergetic photoelectrocatalytic degradation effect was observed in the presence of the birnessite film coated FTO electrode. Photoelectrocatalytic degradation ratios were influenced by film thickness and initial phenol concentrations. Phenol degradation with the thinnest birnessite film and initial phenol concentration of 10mg/L showed the highest efficiency of 91.4% after 8hr. Meanwhile, the kinetics of phenol removal was fit well by the pseudofirst-order kinetic model.
通过对水溶液中的高锰酸钾进行阴极还原，在氟掺杂氧化锡（FTO）涂层玻璃上制备了水钠锰矿薄膜。用X射线衍射、拉曼光谱、扫描电子显微镜和原子力显微镜对沉积的水钠锰矿薄膜进行了表征。研究了水钠锰矿薄膜的光电化学活性，在苯酚存在的情况下，观察到了由局域锰d-d跃迁引起的对可见光的显著光电流。基于这一结果，研究了苯酚的光电催化氧化。与单独的电化学氧化过程或光催化降解苯酚相比，在涂覆有水钠锰矿薄膜的FTO电极存在下，观察到了协同光电催化降解效果。光电催化降解率受薄膜厚度和初始苯酚浓度的影响。在8小时后，最薄的水钠锰矿薄膜和初始苯酚浓度为10mg/L时，苯酚降解效率最高，达到91.4%。同时，苯酚去除动力学与准一级动力学模型拟合良好。
