Vis and UV photocatalytic detoxification methods (using TiO2, TiO2/H2O2, TiO2/O3, TiO2/S2O82−, O3, H2O2, S2O82−, Fe3+/H2O2 and Fe3+/H2O2/C2O42−) for dyes treatment

Domínguez, Joaquín R.; Beltrán, J.; Rodríguez, Oscar M.

doi:10.1016/j.cattod.2005.03.010

Cited by 102 publications

(27 citation statements)

References 29 publications

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“…In this study, OH • radicals in the solution can be produced either from the discharge processes reactions (1)-(2) and (7); and/or from the O 3 decomposition in water reactions (8)- (9). As observed in Table 1, small quantity of OH • radical can be detected when pure oxygen and dry air were used, indicating that O 3 decomposition did take place.…”

Section: Resultsmentioning

confidence: 67%

“…Its attractive feature lies in the ability to generate highly reactive species such as OH • radicals. Most advanced oxidation technologies developed such as photocatalytic oxidation and pulsed electrical discharges focus on OH • radical production directly in the aqueous phase [9][10][11][12][13][14][15][16]. Gas-phase electrical discharge reactors such as dielectric barrier discharge (DBD) and pulsed corona discharge, on the other hand, have long been used to generate ozone (O 3 ), a relatively selective oxidant, with clean dry air or pure oxygen [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Degradation of Azo Dye Acid Red 88 by Gas Phase Dielectric Barrier Discharges

Tang

Jiang

Zhang

et al. 2009

Plasma Chem Plasma Process

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The degradation of an azo dye, acid red 88 (AR88) in aqueous solutions by a gas-phase dielectric barrier discharge (DBD) system was investigated. The reactive species generated from the DBD system such as OH • radical, ozone and hydrogen peroxide were measured. The effects of various parameters such as gas flow rate, initial pH, input power, initial concentration of AR88 and the gas source on the degradation of AR88 were studied. The results show that OH • radical was the major reactive species generated when 100% relative humidity (RH) air was used. An aqueous solution of 25 mg L -1 AR88 was 96.3% degraded in 5 min treatment, and 68% of the initial total organic carbon was removed in 90 min treatment with 100% RH air at 60 W input power and 7 L min -1 gas flow rate. The degradation kinetics of AR88 followed a pseudo-first-order reaction and was dependent on the input power, gas flow rate, initial AR88 concentration and initial pH.

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Section: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Degradation of Azo Dye Acid Red 88 by Gas Phase Dielectric Barrier Discharges

Tang

Jiang

Zhang

et al. 2009

Plasma Chem Plasma Process

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“…The azo dyes that are widely used in the textile, photographic and coating industries cannot be removed sufficiently by conventional processes involving chemical coagulation and precipitation, and biological treatment [22][23][24]. Several researchers have studied the degradation of azo dyes via electrochemical oxidation using a PbO 2 anode [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical degradation of azo dye C.I. Reactive Red 195 by anodic oxidation on Ti/SnO2–Sb/PbO2 electrodes

Song

Fan

et al. 2010

Electrochimica Acta

291

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“…3,5,6 Due to their stability and xenobiotic nature, reactive azo dyes are not totally degraded or exhibit slow degradation by conventional wastewater biological treatment processes. 5 Although the efficiency of advanced oxidation processes for degradation of recalcitrant compounds has been extensively documented, [7][8][9][10][11] their use for removal of dyes from textile wastewater has some drawbacks, such as high operating and equipment costs.…”

Section: Introductionmentioning

confidence: 99%

Azo dye degradation by recycled waste zero-valent iron powder

Pereira¹,

Freire²

2006

J. Braz. Chem. Soc.

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Neste trabalho é apresentado um método eficiente para a degradação de corantes, usando uma fonte de pó de ferro zero ambientalmente amigável (resíduo de um processo industrial). A influência de vários fatores experimentais (tais como: pH, massa de ferro, tamanho de partícula, concentração do substrato, atmosfera inerte ou oxidante) sobre a eficiência do ferro zero em reduzir o grupo cromóforo e o teor de carbono orgânico total de um azocorante (Preto Remazol B) foi avaliada. O processo de degradação do corante apresentou uma cinética de primeira ordem com uma constante de 0,153 min -1 . Nas condições otimizadas (pH=3, [Fe] = 5 g L -1 , tamanho de partícula ≤ 250 μm), este processo promoveu uma descoloração de 95% e redução de 70% na concentração de carbono orgânico total de uma solução 100 mg L -1 do corante. Este processo também foi empregado na degradação de um efluente industrial têxtil apresentando bons resultados e demonstrando capacidade para ser uma alternativa para a remediação de sistemas aquáticos poluídos.In this paper an efficient method for azo dye degradation using an environmentally friendly zero-valent iron powder source is presented (iron particles discarded from a manufacturing process). The influence of several experimental parameters (such as pH, iron mass, particle size, substrate concentration, oxidizing and inert atmospheres) on the ability of zero-valent iron to reduce the chromophoric groups and total organic carbon content of the azo dye Remazol Black B was evaluated. Kinetic studies revealed that the azo degradation by Fe 0 appeared to be first-order with respect to substrate, with an observed rate constant (k obs ) of 0.153 min -1 . Under the optimized operational conditions (pH 3, [Fe] = 5 g L -1 , iron particle size ≤ 250 μm), the iron-based process produced net a reduction in color and total organic carbon of about 95% and 70%, respectively. The process was also evaluated for the degradation of textile effluent. The studied process showed good characteristics, which can make it an effective alternative for polluted aquatic system remediation.Keywords: reductive degradation process, dye degradation, effluent treatment, Fenton´s reagent IntroductionOver the last decades, the increasing demand for dyes by the textile industry has shown a high pollutant potential. It is estimated that around 10 -15% of the dyes are lost in the effluent during the dyeing processes. 1,2 The discharge of highly colored synthetic dye effluents can be very damaging to the receiving water bodies, since these dyes in the water strongly absorb sunlight, which decreases the intensity of light absorbed by water plants and phytoplankton, reducing photosynthesis and the oxygenation of water reservoirs. 3 Also, public perception of water quality is greatly influenced by its color. The presence of unnatural colors is esthetically unpleasant and tends to be associated with contamination. 4 In addition, dyes used in the textile industry may be toxic to aquatic organisms and can be resistant to natural biological deg...

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Vis and UV photocatalytic detoxification methods (using TiO2, TiO2/H2O2, TiO2/O3, TiO2/S2O82−, O3, H2O2, S2O82−, Fe3+/H2O2 and Fe3+/H2O2/C2O42−) for dyes treatment

Cited by 102 publications

References 29 publications

Degradation of Azo Dye Acid Red 88 by Gas Phase Dielectric Barrier Discharges

Degradation of Azo Dye Acid Red 88 by Gas Phase Dielectric Barrier Discharges

Electrochemical degradation of azo dye C.I. Reactive Red 195 by anodic oxidation on Ti/SnO2–Sb/PbO2 electrodes

Azo dye degradation by recycled waste zero-valent iron powder

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