Analytical Studies on the Oxidative Degradation of the Reactive Textile Dye Uniblue A

McCallum, Jeremy; Madison, Stephen A.; Alkan, Sibel; Depinto, Richard L.; Wahl, Roy U. Rojas

doi:10.1021/es0019124

Cited by 7 publications

(10 citation statements)

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“…3. Although Graham et al [5] recommended APS due to its exceptional solubility; we observed in our screening tests that KPS gave a more rapid removal of BY2 than APS at initial neutral pH. The difference in the removal efficiency is apparently due to the presence of the ammonium ion.…”

Section: Effect Of Uv Irradiation In the Presence Of S 2 O 8 2−contrasting

confidence: 48%

“…•− were generated catalytically in alkaline conditions, which induced recombination of these two radicals (Eq. (9)), though this could be minor [5].…”

Section: Effect Of the Initial Phmentioning

confidence: 97%

“…For different S 2 O 8 2− concentrations that increased from 0.1 to 5 mM, the photooxidative reaction rate constants increased from 0.0042 to 0.0642 min −1 , respectively. This is likely because sulfate radicals and hydroxyl radicals are generated simultaneously and improved the photooxidative decolorization of BY2 [5,7]. Furthermore, when the S 2 O 8 2− concentration increased beyond 5 mM, the increment of BY2 decay rate slowed down slightly.…”

Section: Effect Of Initial S 2 O 8 2− Concentrationmentioning

confidence: 98%

“…Potassium peroxydisulfate (KPS) recently was shown to be an effective disinfectant and/or oxidant for the Norwalk virus, foot and mouth disease and Coronaviridae (causing severe acute respiratory syndromes SARS). It has also been reported to be effective for degrading organics in hazardous wastewaters in acidic or basic media through direct chemical oxidation (DCO), where peroxydisulfate is used as a sacrificial reagent [5,6]. However, since the reactions of peroxydisulfate are generally slow at normal temperature, the thermal or photochemical activated decomposition of S 2 O 8 2− ion to S 2 O 8 2− radical has been proposed as a method of accelerating the process [6], as summarized in the following reactions:…”

Section: Introductionmentioning

confidence: 99%

“…Alternatively, potassium peroxydisulfate cost is much cheaper than other oxidants like hydrogen peroxide and ozone. Since peroxydisulfate will start reacting exothermally only at 100 • C [5,6], it is not recommended for use in conventional water purification processes, other factors such as different light intensity, water pH, and temperature might also affect its decomposition rate.…”

Section: Introductionmentioning

confidence: 99%

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The photooxidative destruction of C.I. Basic Yellow 2 using UV/S2O82− process in a rectangular continuous photoreactor

Salari

Niaei

Aber

et al. 2009

Journal of Hazardous Materials

142

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The photooxidative decolorization of C.I. Basic Yellow 2 (BY2), was investigated using UV radiation in the presence of peroxydisulfate (S(2)O(8)(2-)) in a rectangular photoreactor at experimental condition. S(2)O(8)(2-) and UV-light showed negligible effect when they were used independently. Removal efficiency of BY2 was sensitive to the operational parameters such as initial concentrations of S(2)O(8)(2-), BY2, light intensity, flow rate and pH. The conversion ratios of BY2 at the volumetric flow rates of 330, 500 and 650 ml/min were 84%, 79%, 51% in 30 min, respectively. Our results showed that light intensity was a beneficial parameter for dye removal. The results showed that in the presence of S(2)O(8)(2-), the photooxidation quantum yield obtained was higher than direct photolysis quantum yield, suggesting that photodecay of BY2 was dominated by photooxidation. The electrical energy per order (E(EO)) values for decolorization of BY2 solution was calculated. Results show that applying a desired peroxydisulfate concentration can reduce the E(EO).

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Section: Effect Of Uv Irradiation In the Presence Of S 2 O 8 2−contrasting

confidence: 48%

“…•− were generated catalytically in alkaline conditions, which induced recombination of these two radicals (Eq. (9)), though this could be minor [5].…”

Section: Effect Of the Initial Phmentioning

confidence: 97%

Section: Effect Of Initial S 2 O 8 2− Concentrationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The photooxidative destruction of C.I. Basic Yellow 2 using UV/S2O82− process in a rectangular continuous photoreactor

Salari

Niaei

Aber

et al. 2009

Journal of Hazardous Materials

142

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Electrochemical Degradation of Reactive Blue 19 Dye by Combining Boron‐Doped Diamond and Reticulated Vitreous Carbon Electrodes

et al. 2019

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Reactive Blue 19 (RB‐19) dye has a low fixation efficiency, a long half‐life and high toxicity. It is easily loss during the cleaning of textiles and can remain in the environment for a long time, causing serious environmental problems if not removed. This study reports the degradation of RB‐19 by: 1) direct electrochemical degradation with boron‐doped diamond (BDD) electrodes and 2) combined processes using BDD and reticulated vitreous carbon (RVC) electrodes that generate H2O2. The direct degradation uses different current densities and concentrations. High currents densities, longer electrolysis times and low volumetric flow rates favour RB‐19 degradation, removing total colour and 100 % TOC after 5 and 60 min, respectively. At a current density of 41 mA cm−2 and a volumetric flow rate of 20 dm3 h−1, the energy consumption to degrade 20 mg dm−3 of RB‐19 was 279 kWh kg−1. The TOC removal of RB‐19 dye combining BDD and RVC at a current density of 41 mA cm−2 was below 72 % after 90 min and the energy consumption increased to 612 kWh kg−1. The higher energy consumption observed during the combined process suggests that the direct degradation process at low volumetric flow rates is more efficient than the combined process.

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Identification of Chlorophene in a Backwater Stream in Kerala (India) and its Sonochemical Degradation Studies

Rayaroth

Khalid

Sasi

et al. 2015

CLEAN Soil Air Water

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Identification of Chlorophene in a Backwater Stream in Kerala (India) and its Sonochemical Degradation StudiesChlorophene, a chlorinated phenolic compound and a well-known emerging pollutant due to its extensive use as an antimicrobial agent, has been identified in a local backwater stream using liquid chromatography quadrupole time of flight MS (LC-Q-TOF-MS). The concentration of chlorophene has been calculated as 6 Â 10 À7 mol L À1(0.132 ppm). In order to develop a suitable treatment protocol, ultrasound mediated oxidative degradation has been carried out. Prior to the investigation of chlorophene in the backwater sample, the degradation in pure water has been investigated at 620 kHz and 40.25 W mL À1. Complete disappearance of chlorophene was observed within 40 min of sonication. The presence of various inorganic ions had no significant influence on the degradation. A complete chemical oxygen demand removal in the local backwater samples was achieved within 3 h of sonication. Three major intermediate products have been identified by LC-Q-TOF-MS and a plausible mechanism of the degradation is proposed. The same method was applied for the backwater sample containing chlorophene with a concentration of 6 Â 10 À7 mol L À1. Complete disappearance of chlorophene and nearly 85.7% COD removal was observed in this system as well.

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Analytical Studies on the Oxidative Degradation of the Reactive Textile Dye Uniblue A

Cited by 7 publications

References 0 publications

The photooxidative destruction of C.I. Basic Yellow 2 using UV/S2O82− process in a rectangular continuous photoreactor

The photooxidative destruction of C.I. Basic Yellow 2 using UV/S2O82− process in a rectangular continuous photoreactor

Electrochemical Degradation of Reactive Blue 19 Dye by Combining Boron‐Doped Diamond and Reticulated Vitreous Carbon Electrodes

Identification of Chlorophene in a Backwater Stream in Kerala (India) and its Sonochemical Degradation Studies

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