Borrás-Jiménez Daniel, Silva-López Wilber, Nieto-Londoño César
Grupo de Investigación en Óptica y Espectroscopía, Universidad Pontificia Bolivariana, Medellín 050031, Colombia.
Grupo de Investigación en Energía y Termodinámica, Universidad Pontificia Bolivariana, Medellín 050031, Colombia.
Nanomaterials (Basel). 2022 Jul 12;12(14):2385. doi: 10.3390/nano12142385.
Photoelectrocatalysis has been highlighted as a tertiary wastewater treatment in the textile industry due to its high dye mineralisation capacity. However, design improvements are necessary to overcome photo-reactors limitations. The present work proposes a preliminary configuration of a photoelectrocatalytic reactor to degrade Reactive Red 239 (RR239) textile dye, using computational fluid dynamics (CFD) to analyse the mass transfer rate, radiation intensity loss (RIL), and its effect on kinetics degradation, over a photoelectrode based on a TiO2 nanotube. A study to increase the space-time yield (STY) was carried out through mass transfer rate and kinetic analysis, varying the optical thickness (δ) between the radiation entrance and the photocatalytic surface, photoelectrode geometry, inlet flow rate, and the surface radiation intensity. The RIL was determined using a 1D Beer-Lambert-based model, and an extinction coefficient experimentally determined by UV-Vis spectroscopy. The results show that in RR239 solutions below concentrations of 6 mg/L, a woven mesh photoelectrode and an optimal optical thickness δ of 1 cm is enough to keep the RIL below 15% and maximise the mass transfer and the STY in around 110 g/m3-day.
由于具有较高的染料矿化能力，光电催化已成为纺织工业中三级废水处理的重点。然而，必须进行设计改进以克服光反应器的局限性。本研究提出了一种光电催化反应器的初步配置，用于降解活性红239（RR239）纺织染料，使用计算流体动力学（CFD）分析基于TiO2纳米管的光电极上的传质速率、辐射强度损失（RIL）及其对动力学降解的影响。通过传质速率和动力学分析，改变辐射入口与光催化表面之间的光学厚度（δ）、光电极几何形状、入口流速和表面辐射强度，开展了提高时空产率（STY）的研究。使用基于一维比尔-朗伯定律的模型确定RIL，并通过紫外-可见光谱实验确定消光系数。结果表明，在浓度低于6 mg/L的RR239溶液中，编织网光电极和1 cm的最佳光学厚度δ足以使RIL保持在15%以下，并使传质和STY最大化，约为110 g/m3·天。
