Development of new photo-catalytic methods and reactors for water water treatment

摘要

The efficiency of photocatalytic reactors using immobilized photocatalysts have been found to be lower than those using dispersed titanium compound particles (slurry). However, for practical applications, immobilized catalyst is preferred as it does not need an additional separation process to recover the photocatalyst. Zeolites, as catalyst supports, offer the advantage of having high absorptivity for organics in watewater aiding at preconcentrating pollutants on their surface. More than 40 different types of zeolites and their modifications as a support were synthesized and tested. Different mehtods of loading TiO_2 on zeolites and special techniques to charaterize distribution of the photocatalyst were developed. Adsorbency of various organic materials commonly present in wastewater was also evalauted. Lab-scale experiments on the newly developed immobilized photocatalyst particles (100-900 microns) have already been conducted.