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Photocatalytic removal of microcystin-LR by advanced WO3-based nanoparticles under simulated solar light.

Zhao C, Li D, Liu Y, Feng C, Zhang Z, Sugiura N, Yang Y - ScientificWorldJournal (2015)

Bottom Line: In the present study, Pt/WO3 exhibited the best performance for the photocatalytic degradation of MC-LR.The presence of metal cations (Cu2+ and Fe3+) improved the photocatalytic degradation of MC-LR.This study suggests that Pt/WO3 photocatalytic oxidation under solar light is a promising option for the purification of water containing MC-LR.

View Article: PubMed Central - PubMed

Affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan ; School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China.

ABSTRACT
A series of advanced WO3-based photocatalysts including CuO/WO3, Pd/WO3, and Pt/WO3 were synthesized for the photocatalytic removal of microcystin-LR (MC-LR) under simulated solar light. In the present study, Pt/WO3 exhibited the best performance for the photocatalytic degradation of MC-LR. The MC-LR degradation can be described by pseudo-first-order kinetic model. Chloride ion (Cl-) with proper concentration could enhance the MC-LR degradation. The presence of metal cations (Cu2+ and Fe3+) improved the photocatalytic degradation of MC-LR. This study suggests that Pt/WO3 photocatalytic oxidation under solar light is a promising option for the purification of water containing MC-LR.

No MeSH data available.


Photoluminescence spectral changes observed during irradiation of the Pt/WO3 sample. (Experimental conditions: NaOH concentration of 2 × 10−3 M, terephthalic acid concentration of 5 × 10−4 M, Pt/WO3 concentration of 200 mg L−1, and simulated solar light intensity of 0.4 mW cm−2.)
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fig4: Photoluminescence spectral changes observed during irradiation of the Pt/WO3 sample. (Experimental conditions: NaOH concentration of 2 × 10−3 M, terephthalic acid concentration of 5 × 10−4 M, Pt/WO3 concentration of 200 mg L−1, and simulated solar light intensity of 0.4 mW cm−2.)

Mentions: Photocatalytic degradation of MC-LR was initiated by the attack of hydroxyl radical (∙OH) on the conjugated diene structure of ADDA [28], indicating the primary reactive species in MC-LR degradation is ∙OH radical. The photogenerated ∙OH radicals can be detected by photoluminescence spectra analysis. Figure 4 shows the photoluminescent spectral changes of Pt/WO3 during 60 min solar light irradiation. At the wavelength of 425 nm, the photoluminescence intensity gradually increased from 2.5 to 43.8 a.u with increasing the irradiation time to 60 min, indicating that ∙OH radicals were generated on the photocatalyst-water interface via photocatalytic reactions [26, 27].


Photocatalytic removal of microcystin-LR by advanced WO3-based nanoparticles under simulated solar light.

Zhao C, Li D, Liu Y, Feng C, Zhang Z, Sugiura N, Yang Y - ScientificWorldJournal (2015)

Photoluminescence spectral changes observed during irradiation of the Pt/WO3 sample. (Experimental conditions: NaOH concentration of 2 × 10−3 M, terephthalic acid concentration of 5 × 10−4 M, Pt/WO3 concentration of 200 mg L−1, and simulated solar light intensity of 0.4 mW cm−2.)
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4390111&req=5

fig4: Photoluminescence spectral changes observed during irradiation of the Pt/WO3 sample. (Experimental conditions: NaOH concentration of 2 × 10−3 M, terephthalic acid concentration of 5 × 10−4 M, Pt/WO3 concentration of 200 mg L−1, and simulated solar light intensity of 0.4 mW cm−2.)
Mentions: Photocatalytic degradation of MC-LR was initiated by the attack of hydroxyl radical (∙OH) on the conjugated diene structure of ADDA [28], indicating the primary reactive species in MC-LR degradation is ∙OH radical. The photogenerated ∙OH radicals can be detected by photoluminescence spectra analysis. Figure 4 shows the photoluminescent spectral changes of Pt/WO3 during 60 min solar light irradiation. At the wavelength of 425 nm, the photoluminescence intensity gradually increased from 2.5 to 43.8 a.u with increasing the irradiation time to 60 min, indicating that ∙OH radicals were generated on the photocatalyst-water interface via photocatalytic reactions [26, 27].

Bottom Line: In the present study, Pt/WO3 exhibited the best performance for the photocatalytic degradation of MC-LR.The presence of metal cations (Cu2+ and Fe3+) improved the photocatalytic degradation of MC-LR.This study suggests that Pt/WO3 photocatalytic oxidation under solar light is a promising option for the purification of water containing MC-LR.

View Article: PubMed Central - PubMed

Affiliation: Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan ; School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China.

ABSTRACT
A series of advanced WO3-based photocatalysts including CuO/WO3, Pd/WO3, and Pt/WO3 were synthesized for the photocatalytic removal of microcystin-LR (MC-LR) under simulated solar light. In the present study, Pt/WO3 exhibited the best performance for the photocatalytic degradation of MC-LR. The MC-LR degradation can be described by pseudo-first-order kinetic model. Chloride ion (Cl-) with proper concentration could enhance the MC-LR degradation. The presence of metal cations (Cu2+ and Fe3+) improved the photocatalytic degradation of MC-LR. This study suggests that Pt/WO3 photocatalytic oxidation under solar light is a promising option for the purification of water containing MC-LR.

No MeSH data available.