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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.


The molecular structure of microcystin-LR and the main attack sites ((A) benzene ring; (B) methoxy group; (C) conjugated double bond; (D) unsaturated double bond of MDHA) of hydroxyl radicals during photocatalytic reaction. ADDA: 3-amino-methoxy-10-phenyl-2,6,8-trimethyl-deca-4,6-dienoic acid.
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Related In: Results  -  Collection


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fig9: The molecular structure of microcystin-LR and the main attack sites ((A) benzene ring; (B) methoxy group; (C) conjugated double bond; (D) unsaturated double bond of MDHA) of hydroxyl radicals during photocatalytic reaction. ADDA: 3-amino-methoxy-10-phenyl-2,6,8-trimethyl-deca-4,6-dienoic acid.

Mentions: The degradation pathway of MC-LR through photocatalytic reaction has been in detail reported by Su et al. [41]. As shown in Figure 9, MC-LR is a relatively large molecule with a cyclostructure, which consists of a usual 20-carbon amino acid (ADDA) that expresses biological toxicity and an amino acid N-methyldehydroalanine (MDHA). The MC-LR molecule is more readily attacked by ∙OH radicals at four sites of the toxin: three on the ADDA chain ((A) aromatic ring, (B) methoxy group, and (C) conjugated double bonds) and one on the cyclic structure ((D) MDHA amino acid) [28]. Among these, the conjugated double bond (site (C)) at the ADDA moiety of MC-LR molecule has been reported to be susceptible to photocatalytic attack [42, 43]. The destruction of MC-LR molecule by the attack of ∙OH radicals on these sensitive sites leads to production of many kinds of intermediate products, which can be degraded to final products by further reaction with ∙OH radicals.


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)

The molecular structure of microcystin-LR and the main attack sites ((A) benzene ring; (B) methoxy group; (C) conjugated double bond; (D) unsaturated double bond of MDHA) of hydroxyl radicals during photocatalytic reaction. ADDA: 3-amino-methoxy-10-phenyl-2,6,8-trimethyl-deca-4,6-dienoic acid.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig9: The molecular structure of microcystin-LR and the main attack sites ((A) benzene ring; (B) methoxy group; (C) conjugated double bond; (D) unsaturated double bond of MDHA) of hydroxyl radicals during photocatalytic reaction. ADDA: 3-amino-methoxy-10-phenyl-2,6,8-trimethyl-deca-4,6-dienoic acid.
Mentions: The degradation pathway of MC-LR through photocatalytic reaction has been in detail reported by Su et al. [41]. As shown in Figure 9, MC-LR is a relatively large molecule with a cyclostructure, which consists of a usual 20-carbon amino acid (ADDA) that expresses biological toxicity and an amino acid N-methyldehydroalanine (MDHA). The MC-LR molecule is more readily attacked by ∙OH radicals at four sites of the toxin: three on the ADDA chain ((A) aromatic ring, (B) methoxy group, and (C) conjugated double bonds) and one on the cyclic structure ((D) MDHA amino acid) [28]. Among these, the conjugated double bond (site (C)) at the ADDA moiety of MC-LR molecule has been reported to be susceptible to photocatalytic attack [42, 43]. The destruction of MC-LR molecule by the attack of ∙OH radicals on these sensitive sites leads to production of many kinds of intermediate products, which can be degraded to final products by further reaction with ∙OH radicals.

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.