A high throughput fluorescence photo-imaging method has been developed for the screening of photo-degradation catalysts. When employed to analyze the photo-degradation of 1,6-hexamethylenediamine (the probe molecule), the method produced results that are comparable to that when methyl orange was employed as a probe molecule and UV spectrometry as an analysis device. We found that the variation trends in catalytic activity over the same group of catalysts are the same in both cases. The results indicate that the fluorescence photo-imaging method is applicable to the screening of photo-degradation catalysts. For comparison, mesoporous catalysts of high specific surface area prepared by using P123 (HO(CH2CH2O)20(CH2CH(CH 3)O)70(CH2CH2O)20H) as a template and "regular" catalysts (those prepared without P123) were tested. The results showed that most of the former catalysts are superior to the latter counterparts. Our study also revealed that the addition of ZrO 2 to TiO2 did not result in significant improvement in catalytic activities, whereas marked improvement was observed when Nb 2O5 or WO3 was added to TiO2. When Nb2O5 and WO3 were co-doped to TiO2, the tertiary catalysts exhibited higher catalytic activities. The catalysts containing 20-30% of Nb2O5 and 10-20% of WO3 (balanced with TiO2) are superior to any of pure TiO2, Nb2O5, WO3, and the binary catalysts composed of any two of TiO2, Nb2O5, and WO3. Our study has demonstrated that besides the traditional TiO2-domain catalysts, active photo-degradation catalysts can be prepared by combination of Nb2O5, WO3, and ZrO2.
Scopus Subject Areas
- Process Chemistry and Technology
- Physical and Theoretical Chemistry
- High throughput methodology
- Photo-degradation catalysts