TY - JOUR
T1 - Reinvestigation of the oxidation of organic contaminants by Fe(VI)
T2 - Kinetics and effects of water matrix constituents
AU - Wang, Shuchang
AU - Deng, Yang
AU - Shao, Binbin
AU - Zhu, Jiahui
AU - Guan, Xiaohong
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/5/15
Y1 - 2022/5/15
N2 - Since previous studies mostly ignored the contributions of Fe(IV) and Fe(V) during the determination of reaction rate constants of ferrate (Fe(VI)) with trace organic contaminants (TrOCs), the intrinsic oxidation ability of Fe(VI) was overestimated. For the first time, this study systemically evaluated the reactivity of Fe(VI) towards four kinds of TrOCs by blocking Fe(IV)/Fe(V) over the TrOCs degradation, and evaluated the effects of coexisting water matrix constituents. Results revealed that Fe(VI) exhibited superior reactivity towards phenolic compounds. Different from other tested TrOCs, phenolic compounds were mainly degraded by Fe(VI) rather than Fe(IV)/Fe(V). Taking bisphenol A (BPA) as the target TrOC, we found that the coexisting constituents can not only affect the reactivity of different ferrate species (i.e., Fe(IV), Fe(V), and Fe(VI)), but also alter the concentrations of ferrates. HPO42- inhibited the reaction between Fe(VI) and H2O2, while Ca2+, Mg2+, and NH4+ promoted the generation of Fe(IV)/Fe(V) from Fe(VI). Besides, humic acid could increase the contribution of Fe(IV)/Fe(V) to the oxidation of BPA. These findings were validated in real water samples. Taken together, this study provides a new perspective regarding the intrinsic oxidation reactivity of Fe(VI), thereby urging reconsideration of the proper strategies for utilization of high-valent Fe species in practices.
AB - Since previous studies mostly ignored the contributions of Fe(IV) and Fe(V) during the determination of reaction rate constants of ferrate (Fe(VI)) with trace organic contaminants (TrOCs), the intrinsic oxidation ability of Fe(VI) was overestimated. For the first time, this study systemically evaluated the reactivity of Fe(VI) towards four kinds of TrOCs by blocking Fe(IV)/Fe(V) over the TrOCs degradation, and evaluated the effects of coexisting water matrix constituents. Results revealed that Fe(VI) exhibited superior reactivity towards phenolic compounds. Different from other tested TrOCs, phenolic compounds were mainly degraded by Fe(VI) rather than Fe(IV)/Fe(V). Taking bisphenol A (BPA) as the target TrOC, we found that the coexisting constituents can not only affect the reactivity of different ferrate species (i.e., Fe(IV), Fe(V), and Fe(VI)), but also alter the concentrations of ferrates. HPO42- inhibited the reaction between Fe(VI) and H2O2, while Ca2+, Mg2+, and NH4+ promoted the generation of Fe(IV)/Fe(V) from Fe(VI). Besides, humic acid could increase the contribution of Fe(IV)/Fe(V) to the oxidation of BPA. These findings were validated in real water samples. Taken together, this study provides a new perspective regarding the intrinsic oxidation reactivity of Fe(VI), thereby urging reconsideration of the proper strategies for utilization of high-valent Fe species in practices.
KW - Ferrates
KW - Oxidation kinetics
KW - Phenolic compounds
KW - Rate constants
KW - Water matrix constituents
UR - http://www.scopus.com/inward/record.url?scp=85124319064&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2022.128421
DO - 10.1016/j.jhazmat.2022.128421
M3 - Article
C2 - 35152109
AN - SCOPUS:85124319064
SN - 0304-3894
VL - 430
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 128421
ER -