Document
type: Class

Role of 1[O2]* in chlortetracycline degradation by solar radiation assisted by ruthenium metal complexes
has funding vehicle: Consejo Nacional de Ciencia y Tecnología, CONACYT: 290842
abstract: This study was aimed at the degradation of chlortetracycline (CTC) in aqueous solution by direct and indirect photooxidation employing a solar simulator. Ruthenium complexes, tris-(2,2%27-bipyridine) ruthenium(II) chloride (Ru3B), and tris-(1,10-phenanthroline) ruthenium(II) chloride (Ru3P) were used as photosensitizers to promote singlet oxygen (1[O2]*) formation in indirect photooxidation. The degradation kinetics of CTC followed a first-order kinetic, and the rate constant and the maximum percentage of degradation decreased by raising the concentration of CTC. This effect was attributed to that the amount of radiant energy absorbed by each CTC molecule decreased by raising the concentration of CTC. Addition of Ru3B produced a 6.98-fold increase in the degradation rate and 3-fold increment in the maximum percentage of degradation in comparison to direct photolysis. This is due to the formation of 1[O2]* in the aqueous medium, as corroborated by the finding that a reduction in the level of dissolved oxygen produces a proportional decrease in the removal rate of CTC. High-resolution mass spectrometry studies demonstrated that degradation byproducts result from reduction-oxidation processes and the loss of functional groups, highlighting the hydrolysis and reduction of the primary amide, the formation of double bonds, and the addition of 1[O2]* to the aromatic ring of CTC. The presence of humic acid in the solution favored direct photolysis but inhibited the action of photosensitizers. © 2015 Elsevier B.V.
related by: authorship_28726
crisid: 4811
e iscopus: 2-s2.0-84942548958
type: Information Content Entity
most specific type: Article
has funding vehicle: Junta de Andalucía: RNM 172, RNM 7522
freetext keyword: Chlortetracycline; Mechanism; Metal complex; Photodegradation; Solar radiation Byproducts; Chlorine compounds; Degradation; Dissolved oxygen; Mass spectrometry; Mechanisms; Metal complexes; Photolysis; Photooxidation; Photosensitizers; Rate constants; Ruthenium; Ruthenium compounds; Solar radiation; Solutions; Chlortetracycline; Degradation by-products; Degradation kinetics; First order kinetics; High resolution mass spectrometry; Reduction-oxidation; Ruthenium complexes; Tris(1 ,10phenanthroline)ruthenium; Photodegradation
date time value: article date 4811
most specific type: Document
type: Document
page end: 904
has funding vehicle: European Regional Development Fund, FEDER: CTQ2011-29035-C02-02
type: Article
type: Thing
type: Entity
abstract: This study was aimed at the degradation of chlortetracycline (CTC) in aqueous solution by direct and indirect photooxidation employing a solar simulator. Ruthenium complexes, tris-(2,2'-bipyridine) ruthenium(II) chloride (Ru3B), and tris-(1,10-phenanthroline) ruthenium(II) chloride (Ru3P) were used as photosensitizers to promote singlet oxygen (1[O2]*) formation in indirect photooxidation. The degradation kinetics of CTC followed a first-order kinetic, and the rate constant and the maximum percentage of degradation decreased by raising the concentration of CTC. This effect was attributed to that the amount of radiant energy absorbed by each CTC molecule decreased by raising the concentration of CTC. Addition of Ru3B produced a 6.98-fold increase in the degradation rate and 3-fold increment in the maximum percentage of degradation in comparison to direct photolysis. This is due to the formation of 1[O2]* in the aqueous medium, as corroborated by the finding that a reduction in the level of dissolved oxygen produces a proportional decrease in the removal rate of CTC. High-resolution mass spectrometry studies demonstrated that degradation byproducts result from reduction-oxidation processes and the loss of functional groups, highlighting the hydrolysis and reduction of the primary amide, the formation of double bonds, and the addition of 1[O2]* to the aromatic ring of CTC. The presence of humic acid in the solution favored direct photolysis but inhibited the action of photosensitizers. © 2015 Elsevier B.V.
origen: scopus
related by: authorship_28724
type: Continuant
page start: 896
related by: authorship_28728
estado: published
type: Generically Dependent Continuant
related by: authorship_28727
doi: 10.1016/j.cej.2015.09.010
has publication venue: Chemical Engineering Journal
volume: 284
related by: authorship_28725

European Regional Development Fund, FEDER: CTQ2011-29035-C02-02
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funding vehicle for: Role of 1[O2]* in chlortetracycline degradation by solar radiation assisted by ruthenium metal complexes

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Junta de Andalucía: RNM 172, RNM 7522
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funding vehicle for: Role of 1[O2]* in chlortetracycline degradation by solar radiation assisted by ruthenium metal complexes

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Consejo Nacional de Ciencia y Tecnología, CONACYT: 290842
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type: BFO_0000020
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funding vehicle for: Role of 1[O2]* in chlortetracycline degradation by solar radiation assisted by ruthenium metal complexes

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date: 2026-08-25T22:12:06
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Chemical Engineering Journal
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publication venue for: Role of 1[O2]* in chlortetracycline degradation by solar radiation assisted by ruthenium metal complexes
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