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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.


Efficiency of photocatalytic degradation of MC-LR as a function of Cl− concentration. (Experimental conditions: MC-LR concentration of 1 mg L−1, Pt/WO3 concentration of 100 mg L−1, and simulated solar light intensity of 0.4 mW cm−2.)
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fig7: Efficiency of photocatalytic degradation of MC-LR as a function of Cl− concentration. (Experimental conditions: MC-LR concentration of 1 mg L−1, Pt/WO3 concentration of 100 mg L−1, and simulated solar light intensity of 0.4 mW cm−2.)

Mentions: Sodium chloride (NaCl) was introduced into the reaction solution at different concentrations to investigate the effect of Cl− on the photocatalytic degradation of MC-LR. As shown in Figure 7, without Cl− addition, about 88.6% MC-LR was removed after 120 min solar light irradiation. With Cl− addition at the concentration of 0.02 mM, the percentage removal of MC-LR increased to 94.8%, whereas the percentage removal of MC-LR decreased to 79.8% and 74.2%, when the Cl− concentrations were 0.1 mM and 0.2 mM, respectively. The results indicate that Cl− at proper concentration could enhance the photocatalytic degradation of MC-LR, whereas excessive Cl− could inhibit the degradation. This phenomenon can be ascribed to the formation of Cl radicals (∙Cl) in the photocatalytic reaction system. With Cl− addition at an appropriate concentration, the photogenerated holes on the catalyst surface were scavenged by the Cl− ions to form ∙Cl radicals [30, 31]. The ∙Cl radical is also a kind of high reactive species that can oxidize many organic substances. Guo et al. reported that Cl− ions adsorbed on TiO2 surface promoted the photocatalytic oxidation of propylene [32]. However, excessive Cl− ions can also scavenge ∙OH radicals to form Cl2 molecules very quickly, and the reactivity of Cl2 was lower than that of ∙OH [33]. Consequently, when adding Cl− at an excessive concentration, the Cl− ions began to scavenge ∙OH radicals preferentially that decreased the photocatalytic degradation of MC-LR.


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)

Efficiency of photocatalytic degradation of MC-LR as a function of Cl− concentration. (Experimental conditions: MC-LR concentration of 1 mg L−1, Pt/WO3 concentration of 100 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

fig7: Efficiency of photocatalytic degradation of MC-LR as a function of Cl− concentration. (Experimental conditions: MC-LR concentration of 1 mg L−1, Pt/WO3 concentration of 100 mg L−1, and simulated solar light intensity of 0.4 mW cm−2.)
Mentions: Sodium chloride (NaCl) was introduced into the reaction solution at different concentrations to investigate the effect of Cl− on the photocatalytic degradation of MC-LR. As shown in Figure 7, without Cl− addition, about 88.6% MC-LR was removed after 120 min solar light irradiation. With Cl− addition at the concentration of 0.02 mM, the percentage removal of MC-LR increased to 94.8%, whereas the percentage removal of MC-LR decreased to 79.8% and 74.2%, when the Cl− concentrations were 0.1 mM and 0.2 mM, respectively. The results indicate that Cl− at proper concentration could enhance the photocatalytic degradation of MC-LR, whereas excessive Cl− could inhibit the degradation. This phenomenon can be ascribed to the formation of Cl radicals (∙Cl) in the photocatalytic reaction system. With Cl− addition at an appropriate concentration, the photogenerated holes on the catalyst surface were scavenged by the Cl− ions to form ∙Cl radicals [30, 31]. The ∙Cl radical is also a kind of high reactive species that can oxidize many organic substances. Guo et al. reported that Cl− ions adsorbed on TiO2 surface promoted the photocatalytic oxidation of propylene [32]. However, excessive Cl− ions can also scavenge ∙OH radicals to form Cl2 molecules very quickly, and the reactivity of Cl2 was lower than that of ∙OH [33]. Consequently, when adding Cl− at an excessive concentration, the Cl− ions began to scavenge ∙OH radicals preferentially that decreased the photocatalytic degradation of MC-LR.

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.