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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 intensity of pure WO3 and modified WO3-based photocatalysts as a function of irradiation time. (Experimental conditions: NaOH concentration of 2 × 10−3 M, terephthalic acid concentration of 5 × 10−4 M, catalyst concentration of 200 mg L−1, and simulated solar light intensity of 0.4 mW cm−2.)
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fig5: Photoluminescence intensity of pure WO3 and modified WO3-based photocatalysts as a function of irradiation time. (Experimental conditions: NaOH concentration of 2 × 10−3 M, terephthalic acid concentration of 5 × 10−4 M, catalyst concentration of 200 mg L−1, and simulated solar light intensity of 0.4 mW cm−2.)

Mentions: Figure 5 presents the photoluminescence intensity of pure WO3 and modified WO3-based photocatalysts at 425 nm as a function of irradiation time. The photoluminescence intensity induced by simulated solar light in terephthalic acid solution was linearly related to the irradiation time. The number of ∙OH radicals generated on the surface of these photocatalysts was proportional to the irradiation time and followed zero-order kinetic model [26, 28]. Furthermore, the slopes of the regression lines represent the generation rate of ∙OH radicals (Figure 5). Without a dopant, WO3 could only generate a small number of ∙OH radicals under solar light irradiation. The generation rate of ∙OH radicals on the surface of pure WO3 is merely 0.04 a.u min−1. When doped with CuO, Pd, and Pt, the generation rate of ∙OH radicals on WO3 surface was obviously enhanced. During 60 min solar light irradiation, Pt/WO3 achieved the highest generation rate (0.72 a.u min−1) of ∙OH radicals, which was much higher than those by CuO/WO3 (0.17 a.u min−1) and Pd/WO3 (0.42 a.u min−1). Since the photocatalytic degradation of MC-LR was initiated by the attack of ∙OH radical, Pt/WO3 seems to be the most promising photocatalyst for MC-LR removal due to its higher generation rate of ∙OH radicals. Therefore, in the following part, Pt/WO3 was selected as the photocatalyst for MC-LR removal under simulated solar light irradiation.


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 intensity of pure WO3 and modified WO3-based photocatalysts as a function of irradiation time. (Experimental conditions: NaOH concentration of 2 × 10−3 M, terephthalic acid concentration of 5 × 10−4 M, catalyst 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

fig5: Photoluminescence intensity of pure WO3 and modified WO3-based photocatalysts as a function of irradiation time. (Experimental conditions: NaOH concentration of 2 × 10−3 M, terephthalic acid concentration of 5 × 10−4 M, catalyst concentration of 200 mg L−1, and simulated solar light intensity of 0.4 mW cm−2.)
Mentions: Figure 5 presents the photoluminescence intensity of pure WO3 and modified WO3-based photocatalysts at 425 nm as a function of irradiation time. The photoluminescence intensity induced by simulated solar light in terephthalic acid solution was linearly related to the irradiation time. The number of ∙OH radicals generated on the surface of these photocatalysts was proportional to the irradiation time and followed zero-order kinetic model [26, 28]. Furthermore, the slopes of the regression lines represent the generation rate of ∙OH radicals (Figure 5). Without a dopant, WO3 could only generate a small number of ∙OH radicals under solar light irradiation. The generation rate of ∙OH radicals on the surface of pure WO3 is merely 0.04 a.u min−1. When doped with CuO, Pd, and Pt, the generation rate of ∙OH radicals on WO3 surface was obviously enhanced. During 60 min solar light irradiation, Pt/WO3 achieved the highest generation rate (0.72 a.u min−1) of ∙OH radicals, which was much higher than those by CuO/WO3 (0.17 a.u min−1) and Pd/WO3 (0.42 a.u min−1). Since the photocatalytic degradation of MC-LR was initiated by the attack of ∙OH radical, Pt/WO3 seems to be the most promising photocatalyst for MC-LR removal due to its higher generation rate of ∙OH radicals. Therefore, in the following part, Pt/WO3 was selected as the photocatalyst for MC-LR removal under simulated solar light irradiation.

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.