Encapsulating
MnFe LDH in Biochar Tunes Persulfate
Activation from Radical to Nonradical Pathway: Significant Role of
Electron Transfer
Posted on 2023-09-19 - 06:13
Nonradical peroxydisulfate (PDS) oxidation has attracted
great
interest due to its mild oxidant dosage and little environmental impact.
In this study, biochar-supported flower-like MnFe layered double hydroxide
(BC-LDH) was prepared, and the PDS activation mechanisms were probed
with ciprofloxacin (CIP) as representative contaminant. Compared to
biochar (BC), MnFe LDH, and physical mixed BC/LDH, PDS activation
was tuned to an electron-transfer-dominated nonradical pathway with
coprecipitated BC-LDH. Electrochemical techniques including electrochemical
impedance spectroscopy (EIS), linear sweep voltammetry (LSV), Tafel,
and two-chamber experiments confirmed that the synergistic effect
between BC and LDH remarkably facilitated electron transfer from CIP
to PDS. Degradation efficiency ranging from 92 to 94% was achieved
with a PDS dosage ranging from 0.2 to 4 mM, and degradation rate constant
was inversely proportional to the electron transfer resistance of
PDS activators. Three degradation pathways for CIP were proposed based
on the intermediates analyzed by ultra-performance liquid chromatography-mass
spectrometry/MS (UPLC-MS/MS), and the toxicity of CIP was significantly
decreased. This study proposed a novel strategy for enhancing electron-transfer-dominated
nonradical PDS activation pathway with biochar/transition-metal oxide
composites for the remediation of contaminants.
CITE THIS COLLECTION
Zhu, Hongqing; Ma, Hui; Yu, Jingyang; Zhao, Zhiliang; Xu, Lanxin; Li, Xinyi; et al. (1753). Encapsulating
MnFe LDH in Biochar Tunes Persulfate
Activation from Radical to Nonradical Pathway: Significant Role of
Electron Transfer. ACS Publications. Collection. https://doi.org/10.1021/acsestwater.3c00319
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AUTHORS (9)
HZ
Hongqing Zhu
HM
Hui Ma
JY
Jingyang Yu
ZZ
Zhiliang Zhao
LX
Lanxin Xu
XL
Xinyi Li
YR
Yongfang Rao
BL
Bo Lai
SP
Shengyan Pu
KEYWORDS
three degradation pathwaysperformance liquid chromatographymild oxidant dosagemetal oxide compositeslittle environmental impactdegradation rate constantdegradation efficiency rangingchamber experiments confirmedlsv ), tafelpds dosage rangingphysical mixed bcencapsulating mnfe ldhdominated nonradical pathwaypds activation mechanismselectron transfer resistancenonradical pathwaypds activationpds activatorssynergistic effectsupported flowersignificantly decreasedsignificant rolerepresentative contaminantproposed basednovel strategyms ),mass spectrometryinversely proportionalintermediates analyzedenhancing electroncoprecipitated bc4 mm