Abstract:

A new rotating falling film slurry photoreactor（RFFS）was proposed based on the analysis of the characteristics of traditional bubble slurry photoreactor（TBS）.The performance of RFFS was investigated by using Degussa P25 as the photocatalyst and phenol as the model chemical of photocatalytic degradation.In comparison，RFFS had higher efficiency in photocatalytic degradation，especially it could be operated at a higher concentration of catalyst，thus solving the problem of light transfer in the traditional bubble slurry photoreactor.The mass transfer in the photocatalytic slurry was largely strengthened because of the presence of the rotating film on the reactor wall，and the bulk slurry in the center part of the reactor was circulated and flowed down spirally on the reactor wall，and had more time to accept photons.As a result，the efficiency in photocatalytic degradation was largely improved.When circulating flow rate was more than 2.7 L·min-1，aeration rate was 1.0 L·min-1 and catalyst concentration was 3.0 g·L-1，the efficiency in photocatalytic degradation for RFFS increased by 1.6 times for the traditional bubble slurry photoreactor.The degradation kinetics of phenol in RFFS followed apparent first order reaction kinetic model.

Key words:

旋转薄膜光催化反应器, 苯酚, 光催化降解

摘要：

在分析现有光催化反应器特点的基础上，提出了一种新型的旋转薄膜式浆态光催化反应器（RFFS）。用商品化光催化剂Degussa P25，以苯酚模型有机物为降解对象，对比了RFFS与传统鼓泡浆态光催化反应器（TBS）的性能，研究了RFFS的光催化性能。结果表明，与传统浆态光催化反应器相比，RFFS具有较高的光催化性能，尤其是能够在较高的光催化剂浓度下运行。在光催化体系的循环流速大于2.7 L·min-1、供气流量为1.0 L·min-1、催化剂浓度为3.0 g·L-1的条件下，RFFS比传统浆态鼓泡光催化反应器的降解速率提高1.6倍。RFFS利用旋转浆态薄膜强化了光催化反应体系的传质，同时提高了体系中光催化剂对光能的利用率，较好地解决了光在传统浆态体系中的传递问题，为开发新型的具有工业应用前景的光催化反应器提供了方案。苯酚在RFFS中的降解动力学符合表观一级动力学模型，理论值与实验结果吻合较好。

关键词:

旋转薄膜光催化反应器, 苯酚, 光催化降解