Rapid removal of acesulfame potassium by acid-activated ferrate(VI) under mild alkaline conditions

Ghosh, Malini; Manoli, Kyriakos; Renaud, Justin B.; Sabourin, Lyne; Nakhla, George; Sharma, Virender K.; Ray, Ajay K.

doi:10.1016/j.chemosphere.2019.05.069

Cited by 24 publications

(7 citation statements)

References 55 publications

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“…For example, acid activation of Fe(VI) (e.g. HCl) may facilitate the oxidative transition to the development of the intermediate iron species (Fe (V)/Fe (IV))) of micropollutants (Ghosh et al, 2019;Manoli et al, 2017b). The radical sulphate and hydroxy radical were the major oxidants in a detailed analysis during the Fe(VI)/per-oxymonosulfate reaction (Wu et al, 2018).…”

Section: Catalytic Activation Of Fe(vi)mentioning

confidence: 99%

Sustainable ferrate oxidation: Reaction chemistry, mechanisms and removal of pollutants in wastewater

Dar

Pan

Qin

et al. 2021

Environmental Pollution

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Section: Catalytic Activation Of Fe(vi)mentioning

confidence: 99%

Sustainable ferrate oxidation: Reaction chemistry, mechanisms and removal of pollutants in wastewater

Dar

Pan

Qin

et al. 2021

Environmental Pollution

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“…21 Ferrate(VI) has a pH-dependent reduction potential that is higher than that of ozone and chlorine dioxide under acidic conditions, 8,22 and its direct byproducts are nontoxic, insoluble Fe(III) oxides that may support downstream coagulation and filtration processes in water treatment systems. 23,24 Improved transformation of TOCs can be achieved through "activation" of ferrate(VI)�the addition of aqueous-phase reductants, 25−27 acids, 28,29 carbonaceous materials, 30,31 or UV light. 18,32,33 The improvement in effectiveness can be attributed to the formation of Fe(V) (perferryl) and Fe(IV) (ferryl) intermediates, 25,26,34 than the parent Fe(VI) ion toward target compounds.…”

Section: ■ Introductionmentioning

confidence: 99%

Photochemical and Photophysical Dynamics of the Aqueous Ferrate(VI) Ion

et al. 2022

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Ferrate(VI) has the potential to play a key role in future water supplies. Its salts have been suggested as "green" alternatives to current advanced oxidation and disinfection methods in water treatment, especially when combined with ultraviolet light to stimulate generation of highly oxidizing Fe(V) and Fe(IV) species. However, the nature of these intermediates, the mechanisms by which they form, and their roles in downstream oxidation reactions remain unclear. Here, we use a combination of optical and X-ray transient absorption spectroscopies to study the formation, interconversion, and relaxation of several excited-state and metastable high-valent iron species following excitation of aqueous potassium ferrate(VI) by ultraviolet and visible light. Branching from the initially populated ligand-to-metal charge transfer state into independent photophysical and photochemical pathways occurs within tens of picoseconds, with the quantum yield for the generation of reactive Fe(V) species determined by relative rates of the competing intersystem crossing and reverse electron transfer processes. Relaxation of the metal-centered states then occurs within 4 ns, while the formation of metastable Fe(V) species occurs in several steps with time constants of 250 ps and 300 ns. Results here improve the mechanistic understanding of the formation and fate of Fe(V) and Fe(IV), which will accelerate the development of novel advanced oxidation processes for water treatment applications.

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“…Researchers have also demonstrated the multiple roles of Fe VI as a coagulant and oxidant in removing metals, nutrients, radionuclides, humic acids 17–21 and emerging micropollutants (e.g., estrogenic hormone 22,23 , antibiotics 24,25 , and other pharmaceutical ingredients 26 ) in water. Recently, studies have shown that the activated ferrate shortened the reaction time for transforming emerging pollutants that can only be partially be oxidized by Fe VI (or un-activated ferrate) 27–31 .…”

Section: Introductionmentioning

confidence: 99%

Chitosan Encapsulation of FerrateVI for Controlled Release to Water:Mechanistic Insights and Degradation of Organic Contaminant

Chen

Kuo

Sharma

et al. 2019

Sci Rep

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Tetraoxy-anion of iron in +6 oxidation state (FeVIO42−, FeVI), commonly called ferrate, has shown tremendous potential as a green oxidative agent for decontaminating water and air. Encapsulation of solid potassium salt of ferrate (K2FeO4) circumvents the inherent drawbacks of the instability of ferrate under humid conditions. In the encapsulated strategy, controlled release without exposing the solid ferrate to the humid environment avoids self-decomposition of the oxidant by water in the air, and the ferrate is mostly used to decontaminate water efficiently. This study demonstrated the formulation of oxidative microcapsules with natural materials present in chitosan, whose release rate of the core material can be controlled by the type of intermediate hydrocarbon layer and the pH-dependent swelling of chitosan shell. The pH played a pivotal role in swelling chitosan shell and releasing the core oxidant. In a strong acidic solution, chitosan tended to swell quickly and release FeVI at a faster rate than under neutral conditions. Additionally, among the several long-chain hydrocarbon compounds, oleic acid exhibited the strongest “locking” effect when applied as the intermediate layer, giving rise to the slow release of FeVI. Coconut oil and mineral oil, in comparison, allowed FeVI to penetrate the layer within shorter lengths of time and showed comparable degrees of degradation of target contaminant, methylene orange, under ambient temperature and near-neutral conditions. These findings have practical ramifications for remediating environmental and industrial processes.

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Rapid removal of acesulfame potassium by acid-activated ferrate(VI) under mild alkaline conditions

Cited by 24 publications

References 55 publications

Sustainable ferrate oxidation: Reaction chemistry, mechanisms and removal of pollutants in wastewater

Sustainable ferrate oxidation: Reaction chemistry, mechanisms and removal of pollutants in wastewater

Photochemical and Photophysical Dynamics of the Aqueous Ferrate(VI) Ion

Chitosan Encapsulation of FerrateVI for Controlled Release to Water:Mechanistic Insights and Degradation of Organic Contaminant

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