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Rapid Photodegradation of Methyl Orange (MO) Assisted with Cu(II) and Tartaric Acid.

Guo J, Chen X, Shi Y, Lan Y, Qin C - PLoS ONE (2015)

Bottom Line: The results demonstrate that the introduction of Cu(II) could markedly enhance the photodegradation of MO.In addition, high initial concentrations of Cu(II) and tartaric acid benefited the decomposition of MO.Some intermediates in the reaction system were also detected to support this reaction mechanism.

View Article: PubMed Central - PubMed

Affiliation: College of Sciences, Nanjing Agricultural University, Nanjing 210095, P.R. China.

ABSTRACT
Cu(II) and organic carboxylic acids, existing extensively in soil and aquatic environments, can form complexes that may play an important role in the photodegradation of organic contaminants. In this paper, the catalytic role of Cu(II) in the removal of methyl orange (MO) in the presence of tartaric acid with light was investigated through batch experiments. The results demonstrate that the introduction of Cu(II) could markedly enhance the photodegradation of MO. In addition, high initial concentrations of Cu(II) and tartaric acid benefited the decomposition of MO. The most rapid removal of MO assisted by Cu(II) was achieved at pH 3. The formation of Cu(II)-tartaric acid complexes was assumed to be the key factor, generating hydroxyl radicals (•OH) and other oxidizing free radicals under irradiation through a ligand-to-metal charge-transfer pathway that was responsible for the efficient degradation of MO. Some intermediates in the reaction system were also detected to support this reaction mechanism.

No MeSH data available.


Related in: MedlinePlus

Effects of tertiary butyl alcohol (TBA, ~250 mmol/L) and l-histidine (l-H,) on MO degradation.Degradation conditions: 1 mmol/L Cu(II) and 10 mmol/L tartaric acid under the full light of a 300 W medium pressure Hg lamp at pH 4 and 25°C.
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pone.0134298.g002: Effects of tertiary butyl alcohol (TBA, ~250 mmol/L) and l-histidine (l-H,) on MO degradation.Degradation conditions: 1 mmol/L Cu(II) and 10 mmol/L tartaric acid under the full light of a 300 W medium pressure Hg lamp at pH 4 and 25°C.

Mentions: It was noted from Fig 2 that the Cu(II) catalytic degradation of MO in the presence of tartaric acid was clearly suppressed with the introduction of excess tertiary butyl alcohol (~250 mmol/L), especially in the initial 65 minutes (almost no MO degradation), confirming that ·OH resulted from the reaction system and contributed to MO decomposition to some degree. However, there was some MO (~64%) that was still degraded in the system containing excess tertiary butyl alcohol after 65 min, which indicated that there likely were some other types of active substances that were responsible for the destruction of MO.


Rapid Photodegradation of Methyl Orange (MO) Assisted with Cu(II) and Tartaric Acid.

Guo J, Chen X, Shi Y, Lan Y, Qin C - PLoS ONE (2015)

Effects of tertiary butyl alcohol (TBA, ~250 mmol/L) and l-histidine (l-H,) on MO degradation.Degradation conditions: 1 mmol/L Cu(II) and 10 mmol/L tartaric acid under the full light of a 300 W medium pressure Hg lamp at pH 4 and 25°C.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4524705&req=5

pone.0134298.g002: Effects of tertiary butyl alcohol (TBA, ~250 mmol/L) and l-histidine (l-H,) on MO degradation.Degradation conditions: 1 mmol/L Cu(II) and 10 mmol/L tartaric acid under the full light of a 300 W medium pressure Hg lamp at pH 4 and 25°C.
Mentions: It was noted from Fig 2 that the Cu(II) catalytic degradation of MO in the presence of tartaric acid was clearly suppressed with the introduction of excess tertiary butyl alcohol (~250 mmol/L), especially in the initial 65 minutes (almost no MO degradation), confirming that ·OH resulted from the reaction system and contributed to MO decomposition to some degree. However, there was some MO (~64%) that was still degraded in the system containing excess tertiary butyl alcohol after 65 min, which indicated that there likely were some other types of active substances that were responsible for the destruction of MO.

Bottom Line: The results demonstrate that the introduction of Cu(II) could markedly enhance the photodegradation of MO.In addition, high initial concentrations of Cu(II) and tartaric acid benefited the decomposition of MO.Some intermediates in the reaction system were also detected to support this reaction mechanism.

View Article: PubMed Central - PubMed

Affiliation: College of Sciences, Nanjing Agricultural University, Nanjing 210095, P.R. China.

ABSTRACT
Cu(II) and organic carboxylic acids, existing extensively in soil and aquatic environments, can form complexes that may play an important role in the photodegradation of organic contaminants. In this paper, the catalytic role of Cu(II) in the removal of methyl orange (MO) in the presence of tartaric acid with light was investigated through batch experiments. The results demonstrate that the introduction of Cu(II) could markedly enhance the photodegradation of MO. In addition, high initial concentrations of Cu(II) and tartaric acid benefited the decomposition of MO. The most rapid removal of MO assisted by Cu(II) was achieved at pH 3. The formation of Cu(II)-tartaric acid complexes was assumed to be the key factor, generating hydroxyl radicals (•OH) and other oxidizing free radicals under irradiation through a ligand-to-metal charge-transfer pathway that was responsible for the efficient degradation of MO. Some intermediates in the reaction system were also detected to support this reaction mechanism.

No MeSH data available.


Related in: MedlinePlus