Abstract
Ultra-fine zinc oxalate powders were prepared through precipitation stripping method with Bis (2-ethylhexyl) phosphate (HDEHP) diluted by tetrachloride carbon as an extractant, and oxalic acid ethanol aqueous solution as a re-extractant and precipitator. Zinc oxide powders were obtained by decomposing zinc oxalate powders at 450°C. The prepared zinc oxide powders were characterized by TEM, SEM, TG, XRD and FT-IR. The photocatalytic performance of methylene blue by zinc oxide was studied based on the Langmuir model and photo-layer model. The results showed that some zinc oxide powders were micro-multipore materials with hexagonal crystal and the particle size was around 32 nm. The photocatalytic process was the control step in chemical reaction. The photo catalytic process followed the pseudo-first order kinetics and · OH concentration inside the photo-layer in different reaction condition were calculated according to the photo-layer model.
| Original language | English |
|---|---|
| Pages (from-to) | 641-645 |
| Number of pages | 5 |
| Journal | Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology |
| Volume | 27 |
| Issue number | 7 |
| Publication status | Published - Jul 2007 |
Keywords
- Kinetics
- Photocatalysis
- Precipitation stripping method
- ZnO