Degradation of food dyes by zero-valent metals exposed to ultrasonic irradiation in water medium: optimization and electrospray ionization mass spectrometry monitoring

Pavanelli, Sérgio Pinton; Bispo, Glayson Leonardo; Nascentes, Clésia C.; Augusti, Rodinei

doi:10.1590/s0103-50532011000100015

Cited by 14 publications

(13 citation statements)

References 36 publications

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“…Studies have shown that amaranth can cause many adverse health effects, such as high genotoxicity, cytostaticity, and cytotoxicity 17. In the last few years, several studies have been performed on the degradation of amaranth in aqueous solution by hypochlorite,18 zerovalent metals (Fe and Sn) under ultrasonic irradiation,19 electrochemical processes,20 advanced oxidation processes using UV/TiO 2 14, 21 or UV/TiO 2 /O 3 ,21 and biological oxidation 15. The oxidation of amaranth by an advanced photo‐Fenton process in the presence of some aromatic derivatives such as hydroquinones, chlorophenol, dichlorobenzene, aromatic carboxylic acids, anilidine, and nitrophenol has also been investigated recently 22…”

Section: Introductionmentioning

confidence: 99%

Efficient Oxidative Degradation of Azo Dyes by a Water‐Soluble Manganese Porphyrin Catalyst

et al. 2013

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Dyes in wastewater severely affect the nature and quality of water by inhibiting the sunlight penetration into the stream, which thereby reduces the photosynthesis reaction. This poses a serious environmental threat in many developing countries. Recently, new methods for the treatment of colored dye effluent streams have attracted much attention. The [MnIII(tmpyp)]/H2O2 system (tmpyp=meso‐tetrakis(1‐methylpyridinium‐4‐yl)porphyrinato) was now found to degrade various azo dyes with remarkably high efficiency under ambient conditions in aqueous solution at certain pH values. Main products of the catalytic degradation of the dye amaranth by [MnIII(tmpyp)]/H2O2 were analyzed. The reaction mechanism was studied in more detail by using rapid‐scan stopped‐flow spectrophotometry as a function of pH, [catalyst], [H2O2], [dye], and [surfactants]. Spectral analyses and kinetic data suggested rapid formation of an intermediate [MnIII(tmpyp)(OOH)] (a compound 0‐type intermediate), followed by the formation of a relatively stable trans‐dioxomanganese(V) porphyrin complex, [MnV(O)2(tmpyp)] (a compound I analog). The one‐electron reduction of [MnV(O)2(tmpyp)] to [MnIV(O)(tmpyp)] (a compound II analog) was accelerated greatly by amaranth. On the basis of the kinetic and spectroscopic data, a reaction mechanism of the formation of reactive intermediates [MnIII(tmpyp)(OOH)], [MnV(O)2(tmpyp)], and [MnIV(O)(tmpyp)] was proposed.

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Section: Introductionmentioning

confidence: 99%

Efficient Oxidative Degradation of Azo Dyes by a Water‐Soluble Manganese Porphyrin Catalyst

et al. 2013

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“…For E132, the degradation ratio in the presence of ZnO and H2O2 is 69.47 % at 2 min and 97.1% and at 10 min irradiation time for 10 mg L -1 and 50 mg L -1 respectively. Importantly, there was no emergence of new absorption bands after 8 min and 2 min reaction time for E127 and E132 respectively, thus suggesting the presence of by-products (possibly formed under these conditions) [10]. These results indicate that these food dyes can be degraded to a certain extent under ultrasonic dye combined with ZnO powder and H2O2.…”

Section: Effect Of Initial Dye Concentrationmentioning

confidence: 70%

“…The spectra show a clear decrease in the maximum absorption wavelength in the visible region (λ max) for each dye and a hypsochromic shift occurred simultaneously with increasing sonication time *38, 40+. Most importantly, after 30 min of reaction time, no emergence of new absorption bands for E132 and E127 was observed indicating a possible formation of by-products under these conditions as revealed by the low mineralization rates [10].…”

Section: Comparison Of Removal Efficiency Of Food Dyes Using Us Znomentioning

confidence: 90%

“…But the rapid rate of recombination of electron-hole pairs produced is the main limitation for the application of ZnO in the catalytic process (adsorption on ZnO). To prevent the electron-hole recombination, US-ZnO is combined with H2O2 in catalytic process [10,17,18]. In addition, the addition of H2O2 to sonocatalytic oxidation methods increases the efficiency of the decomposition and reduces the time required to remove food dyes [14,19,20].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, it's well known in the sonocatalytic systems that a light with strong energy is generated by the ultrasonic cavitation mechanism which excites ZnO semiconductor leading to the production of • OH radicals for dye degradation [10,16,21].…”

Section: Introductionmentioning

confidence: 99%

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Degradation of C.I. Acid Red 51 and C.I. Acid Blue 74 in Aqueous Solution by Combination of Hydrogen Peroxide, Nanocrystallite Zinc Oxide and Ultrasound Irradiation

Brahim¹,

Belmedani²,

Haddad³

et al. 2018

Journal of Advanced Oxidation Technologies

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This study illustrates the degradation of food dyes, C.I. Acid Red 51 (erythrosine E127) and C.I. Acid Blue 74 (indigo carmine E132) by sonocatalysis using an ultrasonic frequency of 37 kHz and a power of 150 W in the presence of heterogeneous catalysts ZnO and peroxide hydrogen (H2O2). The adsorption process for the two dyes on the ZnO nanocrystalline which satisfies the Freundlich model appears not effective because the elimination of the two food dyes does not exceed 35%.In order to improve the removal, the sonocatalytic process (AD-OX) has been investigated. At this purpose, effect of operating parameters such as initial dye concentrations, H2O2 (0-0.75M) and initial pH on the sonochemical degradation was investigated. It was observed that when the adsorption-catalysis was assisted by the ultrasonic and H2O2 a considerable yields has been achieved and about 86% and 97% of E127 and E132 were removed for 10 mg L -1 and 50 mg L -1 respectively.To understand the behavior of dye degradation, structure of the zinc catalyst before and after the sonocatalytic process was characterized by mean X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM).Results showed that the ZnO particles before and after sonocatalysis were crystallized in the hexagonal wurtzite phase and the size distribution indicates that most of the particles are in the range of 300 and 600 nm. Finally, ADMI and COD analysis were performed in order to quantify the residual color in solution and evaluate the efficiency of the dye mineralization. Results showed that the treatment of food dyes by US-ZnO-H2O2 process increased color degradation (ADMI) and mineralization efficiency (COD) by more than 50% and 76% respectively. problem causing harmful effects on human health and environmental pollution. Food dyes are not toxic but their degradation generate byproducts such as release of aromatic amines [2] which are suspected to be directly or indirectly responsible of several diseases such as endocrine disrupters, anemia nausea, hypertension, cancer, allergies [2]. Thus food dyes and colored effluent must be subject to regular controls [3-5] and treated before their discharge. Although, rigorous standard were established, the tolerance limit of the color change of the receiving environment should not exceed 100 mg Pt.L -1 (platinum-cobalt) [6], and the maximum daily intake (ADI) tolerated in humans is ranging between 30 and 500 ppm [7]. At this purpose, enormous efforts have been made to eliminate food dyes from effluents and conventional methods are often expensive for their implementation and maintenance, and fail to achieve a desired high yield [2,8,9]. Adsorption and oxidation are the most important processes used in industry for the treatment of food dyes [10] but unfortunately, most adsorbents have low adsorption capacity [11]. The advanced oxidation processes (AOPs) have proven and shown to be effective against various colorful and toxic pollutants. They rely on the formation of hydroxyl radica...

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Effectiveness of ozonation and catalytic ozonation (iron oxide) in the degradation of sunset yellow dye

et al. 2020

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Azo dyes present in industrial effluents represent a hurdle that regular treatments cannot overcome. In this study, the application of ozone and a catalytic (iron oxide) ozone treatment were proposed as a means of degrading aqueous sunset yellow dye. In order to understand the factors involved, a rotatable central composite design was applied using the variables time, initial dye concentration (C 0), pH, ozone inlet concentration (O 3), and mass of catalyst, which varied in each case. All variables were significant in colour removal. Extremes in pH, lower C 0 , and higher ozone concentrations are conditions that favour dye degradation. A complete colour loss occurred for certain combinations of these parameters. The application of iron oxide as a catalyst did not present a satisfactory improvement in the reaction rate. Chemical oxygen demand and total organic carbon showed minimum values of 80% and 78%, respectively, for the worst experimental conditions (pH 7.0, C 0 of 45 mg • L −1 , and 5 g O 3 • m −3), while their values were 88% and 83% for the best conditions applied. There was no immobilization of Artemia salina nauplii, even for the experimental run where the maximum concentration of dye of the set was used (45 mg dye • L −1). Ozonation is a promising alternative in the degradation of aqueous sunset yellow dye, being favoured in acidic or basic media, which is especially important since food effluents usually present low pH and show low toxicity. The mathematical model proposed can be useful in the design of wastewater treatment processes.

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Degradation of food dyes by zero-valent metals exposed to ultrasonic irradiation in water medium: optimization and electrospray ionization mass spectrometry monitoring

Cited by 14 publications

References 36 publications

Efficient Oxidative Degradation of Azo Dyes by a Water‐Soluble Manganese Porphyrin Catalyst

Efficient Oxidative Degradation of Azo Dyes by a Water‐Soluble Manganese Porphyrin Catalyst

Degradation of C.I. Acid Red 51 and C.I. Acid Blue 74 in Aqueous Solution by Combination of Hydrogen Peroxide, Nanocrystallite Zinc Oxide and Ultrasound Irradiation

Effectiveness of ozonation and catalytic ozonation (iron oxide) in the degradation of sunset yellow dye

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