This paper presents a novel triphase photocatalytic microreactor by generating periodic gas bubbles in running micro-flows, with the aim to control the Gas-Liquid-Solid interfaces stably, precisely and repeatedly, which can better understand interface kinetics contributing to photocatalytic reactions. The experimental results show that it achieves rapid water treatment with the degradation rate as high as 26.5% s^-1.The oxygen bubbles could promote photocatalytic reactions by adjusting volume ratio, and the degradation of methylene blue is improved by larger than 40% as compared to nitrogen. The reaction rate constants under different volume ratios follow an exponential relationship and tend to saturate after 2:1 (gas:liquid). For oxygen bubbles, the reaction rate constant is k = 0.174 s^-1, about 2.4 times of k₀ (no bubbles). The space time yield is as high as 268.7 g l^-1 day^-1 and the photocatalysis space time yield is also estimated to 10^-6 g l^-1 day^-1 W^-1 due to large distance between light source and microreactor. The simulation results also demonstrate the effect of mass transfer, oxygen diffusion and self-refreshment and are approximately consistent with the experimental results.

本文提出了一种新型的三相光催化微反应器，该微反应器通过在运行的微流中产生周期性的气泡，旨在稳定，精确和重复地控制气-液-固界面，从而更好地了解有助于光催化反应的界面动力学。实验结果表明，它能实现快速水处理，降解率高达26.5％s ^-1。氧气泡通过调节体积比可以促进光催化反应，与之相比，亚甲基蓝的降解率提高了40％以上。氮。在不同体积比下的反应速率常数遵循指数关系，并在2：1（气体：液体）后趋于饱和。对于氧气气泡，反应速率常数为k= 0.174 s ^-1，约为k _0的2.4倍（无气泡）。时空产率高达268.7 gl ^-1 day ^-1，并且由于光源和微反应器之间的距离较大，光催化时空产率也估计为10 ^-6 gl ^-1 day ^-1 W ^-1。模拟结果还证明了传质，氧扩散和自刷新的效果，并且与实验结果大致一致。