Degradation of Orange II in ferrous activated peroxymonosulfate system: Efficiency, situ EPR spin trapping and degradation pathway study

Tan, Chaoqun; Dong, Yujie; Shi, Lei; Chen, Qin; Yang, Shengwei; Liu, Xiaoyu; Ling, Jinfeng; He, Xuefeng; Fu, Dafang

doi:10.1016/j.jtice.2017.11.014

Cited by 53 publications

(14 citation statements)

References 39 publications

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“…Then, different doses of reagents were added according to the corresponding experiment (PMS 0-500 mg/L; TiO 2 0-500 mg/L; Fe 2+ 0-0.5 mM). These concentrations were used according to previous research and literature where the molar ratio was reported by some authors, when using Fe 2+ and PMS, was 1:1, or less; when experiments used additional UV-A radiation, more Fe (II) than that ratio would likely cause a decrease in PMS activation performance [39][40][41][42][43]. Reagents were added directly to the reactor at the beginning of each experiment when the ultraviolet radiation was switched on.…”

Section: Methodsmentioning

confidence: 99%

“…However, a series of reactions are triggered that will result in the production of different types of radicals, such as sulfur pentoxide or hydroxyl, and some anions with less oxidation capacity. The increase in yield and speed in this treatment can be associated with the interaction of the contaminant with a wide variety of oxidizing compounds, and the regeneration of divalent iron by UV spectra [15,40,45].…”

Section: Methylene Blue Discoloration By the Pms/fe 2+ /Uv Systemmentioning

confidence: 99%

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Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

González-Quiles

Andrés

Rodríguez-Chueca

2021

Water

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The increase in world population and human activities are leading to an increase in water stress in many regions of the planet, coupled with a decrease in the quality of water bodies. Advanced oxidation processes have demonstrated great potential for the reduction of almost any organic pollutant; however, it is necessary to intensify this type of treatment in order to reduce contact times and to reach a greater number of pollutants. The generation of sulfate radicals by activation of peroxymonosulfate (PMS) by divalent iron (Fe2+) and/or titanium dioxide (TiO2) were statistically studied to understand the role of these compounds as activators, using methylene blue as target pollutant because of its ease of handling and analysis. A factorial experimental design was used to study the influence of different variables (PMS, Fe2+, and TiO2) in the presence of UV-A or UV-C. There were relevant differences in the discoloration of methylene blue when analyzing the size of the effects and significance of the experiments, when UV-A or UV-C was used, being faster with UV-C. For instance, total discoloration of methylene blue was reached after 60 min with the system PMS/UV-C, while after 90 min only the 59% of methylene blue disappeared in presence of PMS/UV-A. Both Fe2+ and TiO2 in combination with PMS and UV increased the discoloration effect. So, in the presence of Fe2+, total discoloration of methylene blue was observed after 30 min in presence of UV-A, while this yield was reached in 7.5 min under UV-C. In the case of PMS/TiO2, it required 60 min under UV-A radiation to totally remove methylene blue, and around 15 min with UV-C. Statistically, the three variables were observed to have the main effect in combination with UV. Furthermore, the PMS/Fe2+ system has a significant interaction with UV-A and UV-C radiation, while the interaction of PMS/TiO2 was significant under UV-A, but with a negative effect under UV-C, or in other words the high elimination rates observed are achieved by the oxidation potential of UV-C, and the effect of PMS and TiO2 by itself.

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Section: Methodsmentioning

confidence: 99%

Section: Methylene Blue Discoloration By the Pms/fe 2+ /Uv Systemmentioning

confidence: 99%

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

González-Quiles

Andrés

Rodríguez-Chueca

2021

Water

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“…Figure 10 shows the effect of ethanol and tertiary butanol (Free radical quencher) on the removal of CAP (Figure 9(a)) and TOC (Figure 9(b)). Ethanol was used to quench •OH and •SO 4 À , and tertiary butanol was used to quench •OH (Tan et al 2018). The removal ratio of CAP with ethanol (42.0%) was much lower than that without quencher(100.0%).…”

Section: Effect Of Electrolyte Concentrationmentioning

confidence: 98%

Electrochemical degradation of chloramphenicol using Ti-based SnO2–Sb–Ni electrode

Dan

Zhang

Gao

et al. 2021

Water Science and Technology

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Antibiotic residues may be very harmful in aquatic environments, because of limited treatment efficiency of traditional treatment methods. An electrochemical system with Ti-based SnO2-Sb-Ni anode was developed to degrade a typical antibiotic chloramphenicol (CAP) in water. The electrode was prepared by sol-gel method. The performance of electrode materials, impact factors and dynamic characteristics were evaluated. The Ti-based SnO2-Sb-Ni electrode was compact and uniform by the characterization of SEM and XRD. The electrocatalytic oxidation of CAP was carried out in a single-chamber reactor by using Ti-based SnO2-Sb-Ni electrode. For 100 mg L−1 CAP, the CAP removal ratio of 100% and the TOC removal ratio of 60% were obtained at the current density of 20 mA cm−2 and in neutral electrolyte at 300 min. The kinetic investigation has shown that the electro-oxidation of CAP on Ti-based SnO2-Sb-Ni electrode displayed pseudo first-order kinetic model. Free radical quenching experiments presented that the oxidation of CAP on Ti-based SnO2-Sb-Ni electrode resulted from the synergistic effect of direct oxidation and indirect oxidation (·OH and ·SO4−). Doping Ni on the Ti/SnO2-Sb electrode for CAP degradation was presented in this paper, showing its great application potential in the area of antibiotic and halogenated organic pollutants degradation.

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“…During the initial stage, Fe 2+ is oxidized to Fe 3+ extremely readily, whereas the poor recovery of Fe 2+ during the reaction leads to the lack of Fe 2+ available for PMS activation. 11 Thus, the usage efficiency of Fe 2+ in the Fe 2+ /PMS system is not sufficient. 12 To facilitate the transformation of Fe 3+ to Fe 2+ , many methods have been extensively studied in recent years.…”

Section: Introductionmentioning

confidence: 99%

“…In the presence of Cl À , SO 4 c À was rapidly scavenged at high reaction rate constants to form reactive chlorine species (eqn. (11) and ( 12)) such as Clc and Cl 2 c À , which exhibited lower redox potentials than SO 4 c À . 30 As seen in Fig.…”

mentioning

confidence: 98%

MoS₂-assisted Fe²⁺/peroxymonosulfate oxidation for the abatement of phenacetin: efficiency, mechanisms and toxicity evaluation

et al. 2021

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Degradation of Orange II in ferrous activated peroxymonosulfate system: Efficiency, situ EPR spin trapping and degradation pathway study

Cited by 53 publications

References 39 publications

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

Electrochemical degradation of chloramphenicol using Ti-based SnO2–Sb–Ni electrode

MoS₂-assisted Fe²⁺/peroxymonosulfate oxidation for the abatement of phenacetin: efficiency, mechanisms and toxicity evaluation

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Degradation of Orange II in ferrous activated peroxymonosulfate system: Efficiency, situ EPR spin trapping and degradation pathway study

Cited by 53 publications

References 39 publications

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

Study of the Photocatalytic Activity of TiO2 and Fe2+ in the Activation of Peroxymonosulfate

Electrochemical degradation of chloramphenicol using Ti-based SnO2–Sb–Ni electrode

MoS2-assisted Fe2+/peroxymonosulfate oxidation for the abatement of phenacetin: efficiency, mechanisms and toxicity evaluation

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Product

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MoS₂-assisted Fe²⁺/peroxymonosulfate oxidation for the abatement of phenacetin: efficiency, mechanisms and toxicity evaluation