Nitrogen doped bimetallic sludge biochar composite for synergistic persulfate activation: Reactivity, stability and mechanisms

Zheng Li, Haifeng Chen, Chunying Dong, Chuzhan Jin, Meiqiang Cai*, Yan Chen*, Zhiqun Xie, Xingaoyuan Xiong, Micong Jin*

*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

12 Citationer (Scopus)

Abstract

As a recycling use of waste activated sludge (WAS), we used high-temperature pyrolysis of WAS to support bimetallic Fe–Mn with nitrogen (N) co-doping (FeMn@N–S), a customized composite catalyst that activates peroxysulphate (PS) for the breakdown of tetracycline (TC). First, the performance of TC degradation was evaluated and optimized under different N doping, pH, catalyst dosages, PS dosages, and contaminant concentrations. Activating PS with FeMn@N–S caused the degradation of 91% of the TC in 120 min. Next, characterization of FeMn@N–S by XRD, XPS and FT-IR analysis highlights N doping is beneficial to take shape more active sites and reduces the loss of Fe and Mn during the degradation reaction. As expected, the presence of Fe–Mn bimetallic on the catalyst surface increases the rate of electron transfer, promoting the redox cycle of the catalyst. Other functional groups on the catalyst surface, such as oxygen-containing groups, accelerated the electron transfer during PS activation. Free radical quenching and ESR analysis suggest that the main contributor to TC degradation is surface-bound SO4•−, along with the presence of single linear oxygen (1O2) oxidation pathway. Finally, the FeMn@N–S composite catalyst exhibits excellent pH suitability and reusability, indicating a solid practicality of this catalyst in PS-based removal of antibiotics from wastewater.

OriginalsprogEngelsk
Artikelnummer115998
TidsskriftEnvironmental Research
Vol/bind229
Antal sider12
ISSN0013-9351
DOI
StatusUdgivet - jul. 2023

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