Nano tungsten trioxide powder may be prepared by liquid phase ion exchange method and be used as a photocatalyst. It has excellent photocatalytic degradation performance.
Liquid Phase Ion Exchange Method to Produce Fully Tungsten-based Z-type Orthorhombic Hydrated Tungsten Trioxide/Tetragonal Lead Tungstate Composite Photocatalyst
Liquid phase ion exchange method was used to produce fully tungsten-based Z-type orthorhombic hydrated tungsten trioxide/tetragonal lead tungstate (WO3?0.33H2O/PbWO4) composite photocatalyst. The study found:
1. Determine the crystal phase and composition of the composite photocatalyst by XRD and Raman tests.
2. Hydrated tungsten trioxide is generated on the surface of lead tungstate by ion exchange and structural rearrangement.
3. HRTEM test results show that place where the ion exchange takes place is the end of (110) crystal plane of lead tungstate.
4. Photocatalytic performance test shows that the photocatalytic activity of the composite photocatalyst is 6~8 times that of two single phase photocatalysts.
5. The PL spectrum testing results show that performance of the composite photocatalyst is greatly improved due to the increase of separation efficiency of photon-generated carriers.
6. Photocatalytic mechanism test and photodeposition platinum experiment analysis results show that the separation process of photon-generated carriers is a Z-type system.
7. The composite photocatalyst can completely degrade Rhodamine B after illuminated for 40 minutes.
8. After exposed to light for 60 minutes, 82% of methyl orange can be degraded.
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