Crystal violet degradation in the ozone/persulfate/ferroferric oxide system: A heterogeneous catalytic process for simultaneous catalysis of ozone and persulfate

Zhang, Zhen; Chen, Feiyong; Liu, Rupeng; Sun, Cuizhen; Fan, Haoyu

doi:10.1016/j.jclepro.2023.139937

“…In the existing Advanced oxidation processes (AOPs), reactive oxygen radicals were obtained by activating H2O2, O3, PMS and PDS in various ways (e.g., UV, transition metals and electrocatalysis) [9][10][11][12][13][14][15][16][17][18]. Sodium percarbonate (SPC, Na2CO3•1.5H2O2) similar to the above materials is known as solid H2O2 with better stability and longer storage time compared to liquid H2O2.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Anthraquinone Dye Wastewater by Sodium Percarbonate with CoO Heterogeneous Activation

Fan,

Xia,

Sun

et al. 2024

Preprint

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In this work, the optimal efficiency and mechanism of action of CoO activated sodium percarbonate (SPC) for the degradation of Reactive Blue 19 was investigated. The three-factor interaction of SPC concentration, CoO dosage and initial pH and the effects of factors such as anions and humic acids (HA) were investigated. The results show that the CoO/SPC system (93.8%, 0.01015 min− 1) efficiently degraded RB19 and was also suitable for other organic dyes (32.7%~100%) and antibiotics (97.1%~100%). During the activation of SPC by CoO, carbonate radical (CO3•−), hydroxyl radical (•OH), superoxide radical (O2•−) and singlet oxygen (1O2) are involved in the degradation process, among which CO3•− (88.2%) plays an indispensable role, which was proved by quenching experiments and electron paramagnetic resonance (EPR) tests. Co2+ dissolution was lower than 150 µg/L, which meets the emission standard (1 ppm); the application of SPC avoids the problem of acidification of the wastewater, and the final product is green in color. This study presents a novel approach to treating dye wastewater by combining transition metal oxides with sodium percarbonate.

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Upcycling Iron Oxide Scale Slag into a High‐Performance, Sustainable Ozone Catalyst

Du,

Fang,

Lan

et al. 2024

Angewandte Chemie

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Upcycling iron slag into a monolithic catalyst has led to low‐cost heterogeneous catalytic ozonation (HCO) strategies for water treatment. The primary industrial challenges are the low chemical oxygen demand (COD) reduction rate in treating authentic wastewater and difficulties sustaining close‐loop reaction cycles. In this study, we present a monolithic catalyst transformed from low‐cost iron oxide scale slag (IOSM) for highly efficient, sustainable ozone catalysis. The IOSM, constituted of 59.70% Fe2O3 and 40.30% Fe3O4, effectively decomposes ozone into superoxide radicals (·O2⁻) through a close‐loop cyclic reaction facilitated by interfacial charge transfer. This mechanism enables super‐fast degradation of 100 mg·L⁻¹ tetracycline at ozone concentrations below 1.00 mg·L⁻¹ in just four minutes, with the iron leaching merely at 59 μg·L‐1 after 10 cycles. In tests with authentic antibiotic wastewater, the IOSM‐based HCO system achieves a record‐breaking 81.70% COD reduction within two hours. This research underscores the potential of upcycling industrial waste into highly effective ozone catalysts for sustainable practices in wastewater treatment.

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Upcycling Iron Oxide Scale Slag into a High‐Performance, Sustainable Ozone Catalyst

Du,

Fang,

Lan

et al. 2024

Angew Chem Int Ed

0

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Upcycling iron slag into a monolithic catalyst has led to low‐cost heterogeneous catalytic ozonation (HCO) strategies for water treatment. The primary industrial challenges are the low chemical oxygen demand (COD) reduction rate in treating authentic wastewater and difficulties sustaining close‐loop reaction cycles. In this study, we present a monolithic catalyst transformed from low‐cost iron oxide scale slag (IOSM) for highly efficient, sustainable ozone catalysis. The IOSM, constituted of 59.70% Fe2O3 and 40.30% Fe3O4, effectively decomposes ozone into superoxide radicals (·O2⁻) through a close‐loop cyclic reaction facilitated by interfacial charge transfer. This mechanism enables super‐fast degradation of 100 mg·L⁻¹ tetracycline at ozone concentrations below 1.00 mg·L⁻¹ in just four minutes, with the iron leaching merely at 59 μg·L‐1 after 10 cycles. In tests with authentic antibiotic wastewater, the IOSM‐based HCO system achieves a record‐breaking 81.70% COD reduction within two hours. This research underscores the potential of upcycling industrial waste into highly effective ozone catalysts for sustainable practices in wastewater treatment.

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Crystal violet degradation in the ozone/persulfate/ferroferric oxide system: A heterogeneous catalytic process for simultaneous catalysis of ozone and persulfate

Cited by 7 publications

References 74 publications

Degradation of Anthraquinone Dye Wastewater by Sodium Percarbonate with CoO Heterogeneous Activation

Degradation of Anthraquinone Dye Wastewater by Sodium Percarbonate with CoO Heterogeneous Activation

Upcycling Iron Oxide Scale Slag into a High‐Performance, Sustainable Ozone Catalyst

Upcycling Iron Oxide Scale Slag into a High‐Performance, Sustainable Ozone Catalyst

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