Żukowski Witold, Migas Przemysław, Bradło Dariusz, Dulian Piotr
Faculty of Chemical Engineering and Technology, Cracow University of Technology, ul. Warszawska 24, 31-155 Cracow, Poland.
Materials (Basel). 2020 Apr 4;13(7):1691. doi: 10.3390/ma13071691.
The results of a photocatalytic process performed in a new type of inclined, three-phase fluidised bed reactor with a periodic photocatalyst film are presented. These phases were fly ash cenospheres coated with TiO, an aqueous solution of methylene blue and an air stream passing from the bottom of the photoreactor. The cenospheres have a density lower than water and could thus form a catalytic film on a top irradiated window. The formed surface film is stable but is easy to break and be reproduced in a cyclic air-sparged process. Mixing was performed in either a cyclic or a continuous manner. From an operational point of view, the best variant of mixing was a 10 s air-sparge/10 s break with a 50% duty cycle, because it provided the same discolouration efficiency and reduced energy demand by 50% in comparison with the continuous mixing. Due to film formation, the proposed catalytic reactor enables a substantial reduction in the energy required for mixing while maintaining the desired degree of discolouration.
介绍了在一种新型的带有周期性光催化剂薄膜的倾斜三相流化床反应器中进行的光催化过程的结果。这些相分别是涂有TiO的粉煤灰空心微珠、亚甲基蓝水溶液以及从光反应器底部通过的气流。空心微珠的密度低于水，因此可以在顶部受辐照的窗口上形成催化膜。形成的表面膜是稳定的，但很容易破裂，并在循环鼓泡空气过程中得以重现。混合以循环或连续方式进行。从操作角度来看，最佳的混合方式是10秒鼓泡空气/10秒中断，占空比为50%，因为与连续混合相比，它提供了相同的脱色效率，并将能源需求降低了50%。由于成膜作用，所提出的催化反应器能够在保持所需脱色程度的同时，大幅降低混合所需的能量。
