Removal of blue cat 41 dye from aqueous solutions with ZnO nanoparticles in combination with US and US-H2O2 advanced oxidation processes

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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“…The presence of H2O2 is a key parameter for dye decomposition in AOPs technique, depending on its nature of reductants [21,36,37].…”

Section: Effect Of H202 Concentration On Sonocatalytic Systemsmentioning

confidence: 99%

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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“…MgO nano-catalysts exhibit their highest absorption in the wavelength range 385 nm to 360 nm. 31,32 Metal oxides due to their high surface area and low recovery and production costs have a high potential for application in water and wastewater treatment. MgO, among the large family of metal oxides, is a widely used material.…”

Section: Introductionmentioning

confidence: 99%

“…MgO has a bonded cavity (2/3 eV) similar to TiO 2 . 31 Based on a literature review, so far, for different pollutants like dyes, formaldehyde, catechol, and VOCs, heterogeneous COPs has been used, but no reports have yet been published of the removal or degradation of methotrexate. For this reason, MgO has been selected as a solid catalyst for the removal or the degradation of methotrexate.…”

Section: Introductionmentioning

confidence: 99%

Catalytic ozonation process using a MgO nano-catalyst to degrade methotrexate from aqueous solutions and cytotoxicity studies in human lung epithelial cells (A549) after treatment

et al. 2019

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“…Treatment of spent caustic can be carried out by either biological, chemical or thermal processes, each of which can be divided into subcategories (1). Treatment methods such as advanced oxygen process, wet air oxyidation (WAO), incineration, and biological or catalytic pathways which can be used separately or in combination are suggested for treatment of organic compounds (such as spent caustic waste) and refractory substances (6)(7)(8). Incineration is suitable for handling of effluent having more than 100 g/L of chemical oxygen demand (COD), but this treatment is expensive and produces more hazardous compounds (9).…”

Section: Introductionmentioning

confidence: 99%

Regeneration and treatment of sulfidic spent caustic using analytic hierarchy process

Karimi

Fatehifar

Alizadeh

et al. 2016

Environ Health Eng Manag

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Background: Sulfur compounds must be removed from petroleum because they contribute to environmental pollution. A strong alkaline solution such as caustic soda is used to remove these compounds. This spent caustic has high values for chemical oxygen demand (COD) concentration, pH and total sulfur. In this study, the regeneration and treatment methodology of sulfidic spent caustic was investigated by applying the analytic hierarchy process (AHP). Methods: The evaluation index system developed was based on group decision-improved AHP. Expert Choice software was used to simplify decision-making when choosing a practical method and prioritizing treatment of spent caustic. Cost, environmental considerations, availability and scale-up were chosen as criteria and wet air oxidation and biological and catalytic methods were selected as alternative methods. The treatment and regeneration of spent caustic was carried out in a batch bubble column reactor loaded with IVKAZ catalyst and the effluent was treated in a precipitation-stirred tank reactor. Results: Evaluation indicated that cost ranked first among criteria at 40.9%. The results showed that the proposed process produced about 13% (wt) of caustic, 50 g/L of COD and 36 g/L of S 2-. Conclusion: The results indicate that the catalytic method was more effective (0.45) than wet air oxidation and the biological method. This process regenerated more than 85% of initial caustic and the economy of the process improved by the recycling of the stream of caustic.

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Removal of blue cat 41 dye from aqueous solutions with ZnO nanoparticles in combination with US and US-H2O2 advanced oxidation processes

Cited by 22 publications

References 26 publications

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

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

Catalytic ozonation process using a MgO nano-catalyst to degrade methotrexate from aqueous solutions and cytotoxicity studies in human lung epithelial cells (A549) after treatment

Regeneration and treatment of sulfidic spent caustic using analytic hierarchy process

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