| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 94 === A photocatalytic membrane reactor, in which permeation of solutes through a membrane and photocatalytic reaction occur simultaneously, is described. In this photocatalytic membrane reactor, TiO2 catalyst was coated on the surface of ceramic filter tube and most of the experiments were conducted in one pass dead-end system. Acid Red 4 (AR 4) dye and N-Methyl Pyrrolidinone (NMP) were used as model pollutant. A detailed study of physical parameters including solution pH, catalyst loading, light intensity, flow rate and initial pollutant concentration has been performed to obtain the reaction kinetics. The simultaneous effects of catalyst loading-light intensity and catalyst loading-flow rate were also determined experimentally. Experiments were also conducted to compare the photocatalytic degradation of AR 4 in the dead-end and tangential-flow system. The results showed that for both model pollutants, the decomposition ratio increased with increasing catalyst loading and light intensity since more active sites available for reaction, but the decomposition ratio will remain constant at higher catalyst loading since the light cannot penetrate deeper into the catalyst layer. The decomposition ratio was found to be decreased with increasing solution pH and flow rate. In studying the flow rate effect, a photocatalytic reaction model where photocatalytic reaction happened in the outer reaction zone and in the inner reaction zone under membrane permeation condition was proposed and the result was consistent with the observed experimental data.
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