Data underlying the publication: Transport and surface reaction model of a photocatalytic membrane during the radical filtration of methylene blue

This study explores the synergy between photocatalytic oxidation and membrane filtration using a photocatalytic membrane. Titanium dioxide coated alumina membranes were fabricated and tested in a customized Photocatalytic Membrane Reactor (PMR) module. The discoloration of methylene blue (MB), 3.2 mg.L^-1 in an aqueous solution, was evaluated in dead-end filtration mode. A simple 1D analytic transport and surface reaction model was used based on advection and diffusion, containing intrinsic retention by the membrane and reaction kinetics to predict the permeate concentration. The discoloration of MB by the photocatalytic membrane could be well described by a single retention and reaction rate constant (second Damköhler number) for fluxes from 1.6 to 16.2 L.m^-2.h^-1. The model furthermore indicates the potential synergy between membrane retention, which leads to increased concentration, and accompanying photocatalytic conversion, at the membrane surface.<br>

本研究围绕光催化膜展开，探究光催化氧化与膜过滤之间的协同效应。研究制备了二氧化钛包覆氧化铝膜，并在定制化光催化膜反应器（Photocatalytic Membrane Reactor, PMR）模块中开展测试。以浓度为3.2 mg·L⁻¹的亚甲基蓝（MB）水溶液为对象，在死端过滤模式下评估其脱色性能。本研究基于平流与扩散过程构建了简化的一维解析传输-表面反应模型，该模型纳入膜本征截留效应与反应动力学参数，用于预测渗透液浓度。当膜通量介于1.6~16.2 L·m⁻²·h⁻¹时，仅需单一截留参数与反应速率常数（第二达姆科勒数）即可精准描述该光催化膜对亚甲基蓝的脱色过程。此外，该模型还揭示了膜截留（可提升表面浓度）与膜表面伴随发生的光催化转化之间的潜在协同机制。