Development and Optimization of an Immobilized Photocatalytic System within a Stacked Frame Photoreactor (SFPR) Using Light Distribution and Fluid Mixing Simulation Coupled with Experimental Validation
Development and Optimization of an Immobilized Photocatalytic System within a Stacked Frame Photoreactor (SFPR) Using Light Distribution and Fluid Mixing Simulation Coupled with Experimental Validation
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DOI：
10.1021/acs.iecr.8b05709
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发表时间：
2019-02-27
影响因子：
4.2
通讯作者：
Robertson, Peter K. J.
中科院分区：
文献类型：
--
作者：
Boyle, Con;Skillen, Nathan;Robertson, Peter K. J.
最近，光催化反应器的设计着眼于克服传质限制，特别是在具有固定化催化剂的系统中。本文报道了一种将二氧化钛固定在叶片上的钛叶片螺旋桨的设计。为了评估螺旋桨的效率，以香豆素为探针分子，对COMSOL多物理模型进行了实验验证，允许OH自由基的定量。用射线光学模拟了不同辐照距离下的光分布和催化剂的辐照度，实验结果表明，在距螺旋桨4 cm和5 cm处的辐照产生的辐照度最大(29.3和22.1 mW/cm(2))，产生的OH自由基浓度最高(5.38和5.56µM)。对螺旋桨的旋转进行了模拟，并与实验数据进行了比较，以评估在不同转速下的传质极限。这表明，300rpm提供了最高的香豆素降解率(0.32muM/min)，尽管该模型在400rpm时显示了更高的流体速度。
Recently, photocatalytic reactors have been designed with a view toward overcoming mass transfer limitations especially in systems with immobilized catalysts. This paper reports the design of a titanium "bladed" propeller with TiO2 immobilized on the blades. To evaluate the propeller efficiency, modeling using COMSOL Multiphysics was validated experimentally using coumarin as a probe molecule allowing for OH radical quantification. Modeling of light distribution and catalyst irradiance at varying irradiation distance was performed using ray optics, which, alongside experimental work, showed that irradiation at 4 and 5 cm from the propeller yielded the highest irradiance (29.3 and 22.1 mW/cm(2)) and OH radical concentrations (5.38 and 5.56 mu M, respectively). Propeller rotation was modeled and compared against experimental data to assess mass transfer limitations at varying rotation speeds. This showed that 300 rpm provided the highest rate of coumarin degradation (0.32 mu M/min) despite the model showing higher fluid velocities at 400 rpm.