Journal of Environmental Chemical Engineering ( IF 7.7 ) Pub Date : 2020-09-08 , DOI: 10.1016/j.jece.2020.104464 Claudio Passalía , Marina Flores , Sara G.S. Santos , Larissa O. Paulista , Marisol D. Labas , Vítor J.P. Vilar , Rodolfo J. Brandi
This study focuses on the radiation modelling and evaluation of the efficiencies in series regarding the NETmix photocatalytic reactor, using As(III) oxidation to As(V) as a model reaction. The performance of the NETmix reactor was evaluated using two configurations: front-side (FSI) and back-side (BSI) illumination. A CFD radiation modelling for the two configurations was complemented and analyzed with the concept of efficiencies in series. The outer geometrical, the inner geometrical, and the reaction photonic efficiency were considered and their contribution to the overall reactor performance was assessed. The reaction photonic efficiency was obtained through the experimental results of the As(III) oxidation under microscale illumination (UVA-LEDs), using catalyst thin-films (TiO2-P25) with different thickness in both reactor configurations. In a BSI mechanism, 71 % of the catalytic area is subject to a radiation flux between 250 and 450 W m−2, while in the case of a FSI mechanism, 70 % of the surface is illuminated with flux between 0 and 300 W m−2. In other words, even though FSI has a larger catalytic surface area (from 55.4 to 167.3 cm2 for BSI and FSI, respectively), it is worse or less illuminated since most of it corresponds to lateral walls. Along with the reaction photonic efficiency, it was possible to obtain a 2-fold increase in the global efficiency factor when FSI mechanism is used. Hence, the concept of efficiencies in series applied to radiation modelling allowed the identification of the main factors that influence the global reactor performance.
中文翻译:
NETmix光催化反应器中的辐射建模:串联效率的概念
这项研究集中于辐射建模和有关NETmix光催化反应器的串联效率评估,使用As(III)氧化成As(V)作为模型反应。使用两种配置评估NETmix反应器的性能:正面(FSI)和背面(BSI)照明。对这两种配置的CFD辐射建模进行了补充,并通过串联效率的概念进行了分析。考虑了外部几何形状,内部几何形状和反应光子效率,并评估了它们对整体反应器性能的贡献。反应光子效率是通过使用催化剂薄膜(TiO 2)在微型照明(UVA-LED)下As(III)氧化的实验结果获得的-P25)在两种反应器配置中具有不同的厚度。在BSI机理中,71%的催化面积受到250至450 W m -2的辐射通量,而在FSI机理中,70%的表面被0至300 W m的通量照射。−2。换句话说,即使FSI具有更大的催化表面积(从55.4到167.3 cm 2分别针对BSI和FSI),其照度较差或较差,因为其大部分对应于侧壁。随着反应光子效率的提高,使用FSI机制可以使总体效率因子提高2倍。因此,应用于辐射建模的串联效率概念允许确定影响整体反应堆性能的主要因素。