Enhancement of the rate of solar photocatalytic mineralization of organic pollutants by inorganic oxidizing species

Malato, Sixto; Blanco, J.; Richter, Christoph; Braun, Burga; Maldonado, Manuel I.

doi:10.1016/s0926-3373(98)00019-8

Cited by 212 publications

(90 citation statements)

References 51 publications

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“…Malato et al [11] have successfully tested peroxodisulfate (S 2 O 8 2− ) and oxone (2KHSO 5 ·KHSO 4 ·K 2 SO 4 ) which is essentially HSO 5 − and also known as peroxomonosulfate (PMS). This oxidant has been used in the degradation of pentachlorophenol under visible light irradiation in conjunction with a TiO 2 oxidant as an alternative to H 2 O 2 which is widely used for this purpose.…”

Section: Introductionmentioning

confidence: 99%

“…AOT's [10][11][12] uses UV-Vis light to activate the degradation of many organic compounds through the formation of metallo-complexes like: ligand to metal (LMCT), metal to ligand or ligand to ligand (LLCT) charge transfer photo-dissociation states leading to a variety of radicals under light irradiation [6][7][8][9][10]21,23,24]. Ozone has also been used as a source of oxidative radicals in waste water treatment [2].…”

Section: Introductionmentioning

confidence: 99%

“…The values given below for reaction (4) are calculated potentials from equilibria considerations. Details of reactions ( (2)- (4)) have been reported [11,17,21]:…”

Section: Introductionmentioning

confidence: 99%

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Bleaching and photobleaching of Orange II within seconds by the oxone/Co2+ reagent in Fenton-like processes

Fernández

Maruthamuthu

Renken

et al. 2004

Applied Catalysis B: Environmental

125

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Accelerated bleaching, photobleaching and mineralization of the non-biodegradable azo-dye, Orange II, was observed with oxone in solutions with Co 2+ -ions. The bleaching rate of Orange II in the dark was found to follow a first-order kinetics with respect to [Co 2+ ] with a rate constant of 20 M −1 s −1 . Fitting of the Orange II photobleaching experimental points in the presence of the Co 2+ /oxone reagent was carried out and followed the trend known for reactions presenting a chain radical branched mechanism. The photobleaching trace could be fitted by a single mathematical expression with an error <5% with respect to the experimental data. The bleaching trace observed for the Orange II solution in the dark followed zero-order decay kinetics. In a typical run, Orange II (0.20 mM or TOC 30 mg C/l) in the presence of oxone and Co 2+ was bleached under visible light within ∼15 s. The Co 2+ -ion concentrations necessary to catalyze the Orange II mineralization by oxone was observed to be ∼100 times lower than the oxone concentration. A 100% TOC decrease, under visible light irradiation, was attained for an Orange II (0.2 mM) solution in the presence of Co 2+ -ions (0.06 mM) and oxone (20 mM) within times ∼70 min for solutions purged with oxygen. Under visible light irradiation, Orange II mineralization in the presence of O 2 involves the photo-dissociation of reaction intermediates leading to organic peroxides in the second step of the mineralization process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bleaching and photobleaching of Orange II within seconds by the oxone/Co2+ reagent in Fenton-like processes

Fernández

Maruthamuthu

Renken

et al. 2004

Applied Catalysis B: Environmental

125

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“…The use of inorganic oxidizing species has been demonstrated to enhance the rates of degradation of different organic contaminants remarkably because they trap the photogenerated electrons more efficiently than O 2 [34]. For better results, these additives should fulfill the following criteria: dissociate into harmless by-products and lead to the formation of OH or other oxidizing agents [35].…”

Section: The Effect Of Inorganic Oxidizing Speciesmentioning

confidence: 99%

“…For example, the For sodium persulfate, the product SO 4 ÿ is a very strong oxidant (E 0 ¼ 2.6 eV) and engages in at least three reaction modes with organic compounds: by abstracting a hydrogen atom from saturated carbon, by adding to unsaturated or aromatic carbon, and by removing one electron from carboxylate anions and from certain neutral molecules [34]. For Fe(NO 3 ) 3 , Fe(OH) 2þ , the Fe 3þ -hydroxyl species predominant in aqueous solutions in the pH range 2.5e5.5, is the most photoactive Fe 3þ species in the 300e400 nm range.…”

Section: The Effect Of Inorganic Oxidizing Speciesmentioning

confidence: 99%

Microwave assisted photocatalytic degradation of high concentration azo dye Reactive Brilliant Red X-3B with microwave electrodeless lamp as light source

Zhang

Wang

2007

Dyes and Pigments

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Photocatalysis

Herrmann¹

2006

Kirk-Othmer Encyclopedia of Chemical Technology

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When photons are implicated in a catalytic reaction, the system becomes a photocatalytic one. The titania catalyst acts (1) by adsorbing the reactants and (2) by absorbing efficient photons which create electrons and holes, responsible for the subsequent redox reactions. Photocatalysis is a complex polyphasic system, involving simultaneously solid, gaseous and liquid phases plus the uv‐irradiation considered as the “electromagnetic” phase. The action of the five basic physico‐chemical parameters which control the kinetics are deeply described and demonstrated. In dry media, photocatalysis can be used as a means for selective mild oxidation reactions. In the presence of water, the generation of OH° radicals gives total oxidation reactions with a total mineralization in CO 2 + H 2 O of pollutants, pesticides, dyes in water as well as total degradation of pollutants in (humid) air. Several examples are given. The actual tendency is the use of fixed beds of titania photocatalysts for air and water purification. Photocatalytic engineering is also developing with pilot plants, especially in the fields of solar photocatalysis, named “Helio‐photocatalysis” by the author.

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Enhancement of the rate of solar photocatalytic mineralization of organic pollutants by inorganic oxidizing species

Cited by 212 publications

References 51 publications

Bleaching and photobleaching of Orange II within seconds by the oxone/Co2+ reagent in Fenton-like processes

Bleaching and photobleaching of Orange II within seconds by the oxone/Co2+ reagent in Fenton-like processes

Microwave assisted photocatalytic degradation of high concentration azo dye Reactive Brilliant Red X-3B with microwave electrodeless lamp as light source

Photocatalysis

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