School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Beijing Engineering Research Center of Process Pollution Control, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
Beijing Engineering Research Center of Process Pollution Control, CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
Chemosphere. 2019 May;222:38-45. doi: 10.1016/j.chemosphere.2019.01.084. Epub 2019 Jan 21.
Photocatalytic ozonation is an attractive advanced oxidation process for wastewater treatment, but highly active catalysts with strong response to visible light are urgently needed to push forward its practical application. In this study, a hierarchical biomimetic monoclinic bismuth vanadate (BiVO) with leaves morphology was synthesized by a hydrothermal method, and employed as catalyst for oxalic acid and penicillin degradation in photocatalytic ozonation. The results show that the organics degradation was more efficient using leaves shaped BiVO as catalyst than the bulk shaped one in photocatalytic ozonation and the synergy index is ranged from 2.8 to 3.3, indicating a superior positive synergistic effect between photocatalysis and ozonation. The higher activity of the leaves shaped BiVO was probably attributed to the distinctive biomimetic morphology and preferable band structure with more negative CB potential. Mechanism studies suggested that the main reactive species were h and OH for the degradation of persistent oxalic acid in photocatalytic ozonation. In addition, the effect of ozone concentration and inorganic ions and reusability of the material were also intensively investigated.
光催化臭氧氧化是一种很有吸引力的废水处理高级氧化工艺，但需要具有强可见光响应的高活性催化剂来推动其实用化应用。在这项研究中，通过水热法合成了具有叶状形貌的分级仿生单斜氧化铋（BiVO），并将其用作光催化臭氧氧化中草酸和青霉素降解的催化剂。结果表明，在光催化臭氧氧化中，使用叶状 BiVO 作为催化剂比使用块状 BiVO 时有机物的降解效率更高，协同指数范围为 2.8 到 3.3，表明光催化和臭氧氧化之间存在较好的正协同效应。叶状 BiVO 具有更高的活性，可能归因于其独特的仿生形态和更负的 CB 势的更优能带结构。机理研究表明，在光催化臭氧氧化中，持久性草酸降解的主要活性物质是 h 和 OH。此外，还深入研究了臭氧浓度、无机离子的影响以及材料的可重复使用性。
