Dye Catalyzed Oxidation of Industrial Wastes

Sargent, Jerome W.; Sanks, Robert L.

doi:10.1061/jeegav.0000552

Cited by 6 publications

(5 citation statements)

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“…The reason is probably that both agents are efficient 3 RF* quenchers. This finding supports the hypothesis ,,, that the photosensitized degradation of alginate and similar polymers in water under visible light irradiation and aerobic conditions predominantly proceeds through the triplet state of the sensitizer.…”

Section: Resultssupporting

confidence: 89%

Riboflavin-Photosensitized Changes in Aqueous Solutions of Alginate. Rheological Studies

et al. 2003

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Interactions between photoexcited riboflavin (RF), promoted by irradiation in the range of 310-800 nm, and alginate have been studied in air equilibrated aqueous solutions with the aid of rheological methods. Light irradiation of RF causes under aerobic conditions fragmentation of alginate and a decrease in the shear viscosity and other rheological parameters of its solutions. The decrease is most pronounced in concentrated polymer solutions. The photochemical degradation of alginate is inhibited in the presence of the quenchers/scavengers d-mannitol, glutathione, potassium iodide, and sodium azide and in excess oxygen. The addition of thiourea to alginate-RF solutions leads to enhanced degradation of the polymer. Significant shear-thinning effects and deviations from the Cox-Merz rule are observed at higher polymer concentrations.

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Section: Resultssupporting

confidence: 89%

Riboflavin-Photosensitized Changes in Aqueous Solutions of Alginate. Rheological Studies

et al. 2003

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“…The efficiency factors, C, which were calculated by using eq 5 when lower sensitizer concentrations were used, a low sensitizer concentration, on the order of 0.1 mg/L for methylene blue, may be optimum for photolysis system design. Acher and Saltzman (3) and Sargent and Sanks (11,12) found 2-10 mg/L methylene blue to be optimum for the photolysis of bromacil (3) and o-cresol (11,12). The difference in the results of the previous studies and this research may be explained by the differences in light path length.…”

Section: Resultsmentioning

confidence: 60%

“…Two possibilities exist for removal of the sensitizer in the photolysis reactor effluent. Sargent and Sanks (12) proposed using an ion-exchange system for sensitizer removal followed by displacement of the sensitizer from the exchange resin with subsequent recycle to the head of the reactor. Another possibility is related to the low concentration of sensitizer proposed in the current study.…”

Section: Applicationmentioning

confidence: 99%

“…Indirect photolysis mechanisms include singlet oxygen generation (3,4), free radicals (5), organic hydroperoxides (6), and hydrogen peroxide and hydroxyl radical (7,8). The process has been effective in degrading pesticides (9), polycyclic aromatic hydrocarbons (10), phenols (11,12), and chloroanilines (13,14).…”

Section: Introductionmentioning

confidence: 99%

“…Sargent and Sanks (11,12) performed a bench-scale treatability study for the indirect photolysis of phenol and o-cresol. They determined optima for pH, sensitizer concentration, and waste concentration.…”

Section: Introductionmentioning

confidence: 99%

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