Changes in the sulfur forms of subbituminous coals during oxidation with hydrogen peroxide and peracetic acid

Kato, Takahiro; Uaciquete, Dorcas Linda Ernesto; Onodera, Gai; Okawa, Hirokazu; Sugawara, Katsuyasu; Worasuwannarak, Nakorn

doi:10.1016/j.fuel.2022.125544

Cited by 2 publications

(2 citation statements)

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“…The reactivity of metalloles (derivatives of cyclopentadiene in which a carbon atom is replaced by a heteroatom) increased when they contained a sulfur heteroatom instead of an oxygen heteroatom (i.e., thiophene compared to furan). The strong reactivity of thiophene with PAA has been previously demonstrated during the oxidation of subbituminous carbons, resulting in the formation of sulfate ions or sulphone compounds . PFA was slightly consumed by phenol and very slightly by aniline (considering the standard deviation of RCR results).…”

Section: Resultsmentioning

confidence: 70%

“…The strong reactivity of thiophene with PAA has been previously demonstrated during the oxidation of subbituminous carbons, resulting in the formation of sulfate ions or sulphone compounds. 40 PFA was slightly consumed by phenol and very slightly by aniline (considering the standard deviation of RCR results). The reactivity of substituted benzenic compounds largely increased with the addition of a second electron-donating group such as hydroxyl (−OH) (resorcinol, hydroquinone, and catechol compared to phenol and 4-aminophenol compared to aniline).…”

Section: Resultsmentioning

confidence: 99%

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Reactivity of Performic Acid with Organic and Inorganic Compounds: From Oxidation Kinetics to Reaction Pathways

Nabintu Kajoka,

Gasperi,

Brosillon

et al. 2023

ACS EST Water

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Performic acid (PFA) has gained interest as an alternative chemical disinfectant for wastewater (WW) treatment, but its reactivity with WW constituents remains poorly understood. This study evaluated PFA's ability to oxidize 45 inorganic and organic compounds commonly found in WW (amino acids, simple organic compounds with specific functional groups, e.g., amines and phenolic compounds, and pharmaceutical micropollutants). PFA does not react with most major ions, except for iodide ions, and reacts with iron(II) in the absence of phosphate buffer. While many organic molecules do not react with PFA, compounds containing reducedsulfur moieties (e.g., thioether or thiol) are the most reactive (i.e., ranitidine, benzenethiol, and 3-mercaptophenol), followed by compounds with tertiary amine groups (e.g., lidocaine). The reactions follow second-order kinetics with respect to both organic compounds and PFA concentrations. Similar trends were observed in real WW effluents, although removals of pharmaceuticals were lower than expected due to the probable consumption of PFA by WW constituents (dissolved organic carbon, other micropollutants, or transition metals). The results highlight PFA's selective reactivity with specific functional groups and a low transformation of compounds mostly through oxygen addition (e.g., S-oxide or sulfonyl compounds formed from thiol and thioether moieties and N-oxides from amine groups) with similar mechanisms to peracetic acid.

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%