Role of complexing agents on oxidative degradation of chlorophenolic compounds by pyrite-Fenton process: Batch and column experiments

Ligand-Enhanced Electron Utilization for Trichloroethylene Degradation by ·OH during Sediment Oxygenation

“…Previous studies regarding the influence of ligands on · OH production and contaminant degradation in Fe­(II)–O 2 model systems partly support our hypothesis. − Ligands such as ethylene diamine tetraacetic acid (EDTA), nitrilotriacetic acid (NTA), and sodium tripolyphosphate (TPP) have been proven to increase the yield of · OH production upon oxygenation of dissolved Fe­(II), − pyrite, − magnetite, , and Fe­(II)-bearing clay minerals. − Particularly, for the oxygenation of reduced nontronite (a model Fe-rich clay mineral), Zeng et al found that ligands could dissolve a fraction of solid Fe­(II) and then enhance the yield and rate of oxidant production through electron transfer from solid Fe­(II) to dissolved Fe­(III) . Because of the much more complicated composition of real sediments, it is still uncertain to what extent and how ligands influence · OH production and contaminant degradation during sediment oxygenation.…”

Pyrite nanoparticles derived from mine waste as efficient catalyst for the activation of persulfates for degradation of tetracycline

“…The presence of peaks at 601 and 555 cm − 1 were ascribed to the stretching vibration of the Fe-S bond and asymmetric stretching vibration of Fe-O− OH species [61]. Although a band at 407 cm − 1 was evidenced for pyrite samples [62], in this study, the band moved to a higher wavenumber, of cm − 1 , which could be explained by the presence of minor impurities including Cu, Al, and Si elements.…”

Use of mine waste for H2O2-assisted heterogeneous Fenton-like degradation of tetracycline by natural pyrite nanoparticles: Catalyst characterization, degradation mechanism, operational parameters and cytotoxicity assessment

“…As the degradation via OH radicals produced in the solution phase (mechanism (ii)) is inevitable and has well been established in the pyrite-Fenton process by many researchers (Che et al, 2011;Kantar et al, 2015aKantar et al, , 2015bKantar et al, , 2019aKantar et al, , 2019bKantar et al, , 2019cOral et al, 2017;Oral and Kantar, 2019;Rahim Pouran et al, 2014;Shaida et al, 2018), additional experimental runs to prove the incidence of this reaction doesn't seem necessary. Moreover, the total concentration of Fe in the treated TTC solution at present work was measured and detected to be about 0.43 mg/L, which confirmed the occurrence of the pyrite-Fenton reaction to produce solution phase OH radicals.…”

“…To date, many studies have demonstrated that organic pollutants such as pharmaceutical compounds can be successfully degraded via pyrite in the heterogeneous Fenton-like process (Bae et al, 2013;Che et al, 2011;Gosselin et al, 2013;Labiadh et al, 2015). Although there is a large number of studies performed with raw pyrite from mining (Diao et al, 2017;Kantar et al, 2019b;Labiadh et al, 2015), there is no study evaluating the catalytic activity of mine waste pyrite in the pyrite Fenton process for degradation of TTC as a recalcitrant water pollutant. Also, the difference in the cytotoxicity of the raw pharmaceutical solution and treated effluent has not been checked in the studies using the pyrite Fenton process for degradation of pharmaceutical pollutants.…”