Catalytic ozonation of basic yellow 87 with a reusable catalyst chip

BACKGROUND: An ozonation catalyst needs to be recycled easily and to exhibit high activity in view of its practical application in wastewater treatment. In this study, magnetic mesoporous MgFe 2 O 4 was successfully prepared and used as a new ozonation catalyst for degradation of Acid Orange II (AOII). The role of Mg in MgFe 2 O 4 was revealed to explain the high activity by catalytic experiments and XPS analysis. RESULTS: The degradation efficiency of AOII in the MgFe 2 O 4 /O 3 process exceeds 90% over a wide pH range of 4.6-9.6, slightly affected by the solution pH. The catalytic activity of MgFe 2 O 4 is much higher than that of MgO, Fe 2 O 3 and also their mixture (MgO+Fe 2 O 3 ) with identical molar ratio of Mg 2+ to Fe 3+ , indicating the first role of Mg, i.e. coupling with Fe to present a synergistically catalytic effect. Furthermore, MgFe 2 O 4 possesses a reaction rate constant at least 2.3 times that of NiFe 2 O 4 , MnFe 2 O 4 , and CuFe 2 O 4 . It illustrates the second role of Mg, i.e. causing the high electron density on lattice oxygen in MgFe 2 O 4 indicated by XPS and thus favoring activation of the electrophilic ozone. CONCLUSIONS: This study demonstrated the easy recycling and high activity of MgFe 2 O 4 in catalytic ozonation, and revealed the role of Mg in MgFe 2 O 4 . /jctb J Chem Technol Biotechnol 2016; 91: 985-993

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“…These refractory intermediates degraded slowly even under catalytic ozonation. This phenomenon has been reported in other literature …”

Section: Resultssupporting

confidence: 88%

Role of Mg in mesoporous MgFe₂O₄ for efficient catalytic ozonation of Acid Orange II

Wei

Chang

et al. 2015

J of Chemical Tech & Biotech

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“…In general, ozonation ability is well documented in remediating low‐ and mild‐strength pollutants, such as in domestic wastewater treatment (Gomes et al, 2019; Multani et al, 2014). Zhu et al (2014) recorded high removal rates of COD, color, and NH 3 –N from wastewater at 99%, 60%, and 30%, respectively, by combining ozone with catalyst chips. However, the efficiency of ozone (O 3 ) in remediating stabilized leachate has not been well documented.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of ozonation with zirconium and tin tetrachloride for stabilized anaerobic landfill leachate treatment

Zakaria

Aziz

Alazaiza

2022

Water Environment Research

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Landfill leachate can threaten the environment and human life. Therefore, this study aims to investigate the efficiency of ozone (O 3 ), O 3 with zirconium tetrachloride (O 3 /ZrCl 4 ), and O 3 with tin tetrachloride (O 3 /SnCl 4 ) in remediating the stabilized anaerobic landfill leachate (SAL) from Alor Pongsu, Perak. Hydroxyl radical (OH•) is an important oxidizing agent in the ozonation process. Its presence was tested using tert-butyl alcohol. Results showed that using ZrCl 4 and SnCl 4 in ozonation boosted the generation of hydroxyl radical, thereby enhancing the oxidation process and pollutant removal inside the sample. The O 3 /ZrCl 4 mix at chemical oxygen demand (COD) to ZrCl 4 ratio of 1:1.5, pH 8-9, and 90-min reaction time resulted in the highest reduction rates of COD and color at 91.9% and 99.6%, respectively. All results demonstrated that the optimum performance occurred at alkaline conditions (pH > 8), proving that OH radicals primarily oxidized the pollutants through an indirect reaction pathway. The biodegradability (biochemical oxygen demand/COD) ratio was also considerably improved from 0.02 (raw) to 0.37 using O 3 /ZrCl 4 , compared with using O 3 alone and using O 3 / SnCl 4 , which only recorded 0.23 and 0.28, respectively, after the treatment. The study demonstrated that O 3 /ZrCl 4 was the most efficient combination. Practitioner Points• The O 3 /ZrCl 4 recorded the highest COD and color removals.• The O 3 /ZrCl 4 combination also recorded higher OH• concentrations.• The biodegradability of leachate (BOD 5 /COD ratio) improved from 0.02 to 0.37.

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“…Modern catalytic materials strive to increase the effectivity of catalytic ozonation by changing the properties of the catalyst surface, such as porosity, pore-volume, or mechanical strength. When creating such catalysts, these already proven materials are often combined to obtain a product that exhibits even better properties: composites [95,96], metals, or metal oxides on support [62,[97][98][99][100][101][102]. Increasing the mesoporosity of the material or its delamination provides more active sites where catalytic reactions can take place [66,103,104].…”

Section: Novel Materialsmentioning

confidence: 99%

Homogeneous and Heterogeneous Catalytic Ozonation of Textile Wastewater: Application and Mechanism

Bilińska

Gmurek

2022

Catalysts

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This paper presents an overview of textile wastewater treatment by catalytic ozonation, highlighting the parameters of the process and accompanying mechanisms. Since more than 800,000 tons of dyes are produced annually and thousands of cubic meters of highly polluted textile wastewater have been emitted into the environment every day, this issue has become an environmental concern. Due to the high oxidative potential of ozone (2.08 V) and hydroxyl radical (2.80 V), the main reactive species in catalytic ozonation, the burdensome organic pollutants, including textile dyes, can be successfully decomposed. The paper shows the main groups of catalysts, emphasizing novel structural, nano-structured, and functionalized materials. The examples of catalytic ozonation in the industrial application for real textile wastewater were specially highlighted.

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Catalytic ozonation of basic yellow 87 with a reusable catalyst chip

Cited by 30 publications

References 42 publications

Role of Mg in mesoporous MgFe₂O₄ for efficient catalytic ozonation of Acid Orange II

Role of Mg in mesoporous MgFe₂O₄ for efficient catalytic ozonation of Acid Orange II

Effectiveness of ozonation with zirconium and tin tetrachloride for stabilized anaerobic landfill leachate treatment

Homogeneous and Heterogeneous Catalytic Ozonation of Textile Wastewater: Application and Mechanism

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Catalytic ozonation of basic yellow 87 with a reusable catalyst chip

Cited by 30 publications

References 42 publications

Role of Mg in mesoporous MgFe2O4 for efficient catalytic ozonation of Acid Orange II

Role of Mg in mesoporous MgFe2O4 for efficient catalytic ozonation of Acid Orange II

Effectiveness of ozonation with zirconium and tin tetrachloride for stabilized anaerobic landfill leachate treatment

Homogeneous and Heterogeneous Catalytic Ozonation of Textile Wastewater: Application and Mechanism

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Role of Mg in mesoporous MgFe₂O₄ for efficient catalytic ozonation of Acid Orange II

Role of Mg in mesoporous MgFe₂O₄ for efficient catalytic ozonation of Acid Orange II