2015
DOI: 10.1021/acsami.5b09919
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Hydrothermal Synthesis of FeS2 as a High-Efficiency Fenton Reagent to Degrade Alachlor via Superoxide-Mediated Fe(II)/Fe(III) Cycle

Abstract: In this study, we demonstrate that hydrothermally synthesized FeS2 (syn-FeS2) is highly efficient at catalyzing the H2O2 decomposition for alachlor degradation at a wide range of initial pH (3.2-9.2). The alachlor degradation rate of syn-FeS2 heterogeneous Fenton system was almost 55 times that of its commercial pyrite (com-FeS2) counterpart at an initial pH of 6.2. Experimental results revealed that the alachlor oxidation enhancement in the syn-FeS2 Fenton system was attributed to the molecular oxygen activat… Show more

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Cited by 212 publications
(73 citation statements)
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References 49 publications
(80 reference statements)
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“…In this study, the degradation reaction of ciprofloxacin was dramatically suppressed when methanol (40 mmol/L) was added in the systems catalyzed by FeS/Fe3O4 and FeS/Fe3O4@BC500, according to the results shown in Figure 6a. The results confirm that • OH is the reactive species that has made the major contribution for the oxidation of ciprofloxacin, which is consistent with previous reports about the Fenton-type reactions catalyzed by iron minerals [27,29,31,32,39,47,48]. For further investigating the role of biochar, the cumulative production of • OH in the two Fenton-type systems was measured using benzoic acid (BA) as the probe.…”
Section: Investigation About the Reactive Speciessupporting
confidence: 89%
“…In this study, the degradation reaction of ciprofloxacin was dramatically suppressed when methanol (40 mmol/L) was added in the systems catalyzed by FeS/Fe3O4 and FeS/Fe3O4@BC500, according to the results shown in Figure 6a. The results confirm that • OH is the reactive species that has made the major contribution for the oxidation of ciprofloxacin, which is consistent with previous reports about the Fenton-type reactions catalyzed by iron minerals [27,29,31,32,39,47,48]. For further investigating the role of biochar, the cumulative production of • OH in the two Fenton-type systems was measured using benzoic acid (BA) as the probe.…”
Section: Investigation About the Reactive Speciessupporting
confidence: 89%
“…was formed by direct scission of the C-Cl bond of alachlor, and was further oxidized to compounds 8 and 7, as reported in other AOPs[18,45,46]. The cleavage of the C-N bond occurring by α/β scission of the bond and hydroxylation generate compound which could be oxidized via the further cleavage of the C-Cl bond and hydrogen abstraction to form 8, as also reported in BDD(•OH) oxidation[21].…”
mentioning
confidence: 53%
“…On the basis of these intermediates and the related literatures [16,18,20,21,[45][46][47], we proposed that alachlor degradation mechanism involved alkylic oxidation, cleavage of C-N, C-Cl, C-O, and/or C-C bonds, cyclization, and dealkylation ( Figure 4). First, compound A c c e p t e d m a n u s c r i p t 11 2 was generated by dealkylation of alachlor upon the attack by •OH and then further oxidized to compounds 6 and 5 by scission of the R-N bond and hydroxylation, as it has been previously observed in photo-Fenton oxidation [16].…”
Section: Alachlor Oxidationmentioning
confidence: 84%
“…The improved performance of the Fe 78 Si 9 B 13 reusability is owing to the following reasons. (1) The pH value plays a significant role in the Fenton/Fenton-like reaction5960, as hydroxyl radicals (∙OH) can be rapidly activated under pH 2 by using Fe 78 Si 9 B 13 and H 2 O 2 13 whereas the pH of MB dye solution after adding Fe 78 Si 9 B 13 and persulfate in this work is only 3.39. The acidic conditions can enhance the corrosive speed of the SiO 2 layer on the Fe 78 Si 9 B 13 surface leading to fast surface decay behaviour.…”
Section: Discussionmentioning
confidence: 80%