Persistent free radicals in biochar enhance superoxide-mediated Fe (III)/Fe (II) cycling and the efficacy of CaO2 Fenton-like treatment

S Zhang, Y Wei, J Metz, S He, PJJ Alvarez… - Journal of Hazardous …, 2022 - Elsevier
Abstract Superoxide radicals (O 2•-) produced by the reaction of Fe (III) with H 2 O 2 can
regenerate Fe (II) in Fenton-like reactions, and conditions that facilitate this function enhance …

Effects of heterogeneous metals on the generation of persistent free radicals as critical redox sites in iron-containing biochar for persulfate activation

C Huang, F Qin, C Zhang, D Huang, L Tang… - ACS ES&T …, 2022 - ACS Publications
Metal components have critical influences on the generation of persistent free radicals
(PFRs) in biochar. However, little is known about the effect on the formation of PFRs brought …

Accelerating Fe2+/Fe3+ cycle via biochar to improve catalytic degradation efficiency of the Fe3+/persulfate oxidation

Y Tang, J Dou, Z Lu, J Xu, Y He - Environmental Pollution, 2023 - Elsevier
Abstract The sluggish Fe 3+/Fe 2+ cycle was the rate-limiting step in the Fenton-like
reaction, and metal-free carbonaceous materials are considered as emerging alternatives to …

Formation, characteristics, and applications of environmentally persistent free radicals in biochars: a review

X Ruan, Y Sun, W Du, Y Tang, Q Liu, Z Zhang… - Bioresource …, 2019 - Elsevier
Due to abundant biomass and eco-friendliness, biochar is exemplified as one of the most
promising candidates to mediate the degradation of environmental contaminants. Recently …

N, S-codoped biochar outperformed N-doped biochar on co-activation of H2O2 with trace dissolved Fe (Ⅲ) for enhanced oxidation of organic pollutants

M Lai, J Li, H Li, Y Gui, J Lü - Environmental Pollution, 2023 - Elsevier
Co-activation of H 2 O 2 with biochar and iron sources together provides an attractive
strategy for efficient removal of refractory pollutants, because it can solve the problems of …

Biochar enhanced the degradation of organic pollutants through a Fenton process using trace aqueous iron

D Feng, J Lü, S Guo, J Li - Journal of Environmental Chemical Engineering, 2021 - Elsevier
The Fenton process is among the most popular technique for oxidation of organic pollutants,
but faces the challenges of slow Fe (III)/Fe (II) cycling, limited radical dot OH production, and …

Fe3S4/biochar catalysed heterogeneous Fenton oxidation of organic contaminants: Hydrogen peroxide activation and biochar enhanced reduction of Fe (III) to Fe (II)

PM Bhuyan, S Borah, BK Bhuyan, S Hazarika… - Separation and …, 2023 - Elsevier
Greigite and biochar are two important materials recently gaining importance in Fenton
catalysis to remove organic contaminants. Each material, however, has significant …

High-efficiency degradation of organic pollutants with Fe, N co-doped biochar catalysts via persulfate activation

X Li, Y Jia, M Zhou, X Su, J Sun - Journal of hazardous materials, 2020 - Elsevier
In this study, the Fe, N co-doped biochar (Fe-N-BC) was prepared by pyrolyzing wheat
straw, urea and iron salts and used to activate persulfate (peroxydisulfate, PS) for organic …

[HTML][HTML] Boron carbide boosted Fenton-like oxidation: A novel Fe (III)/Fe (II) circulation

P Zhou, F Cheng, G Nie, Y Yang, K Hu, X Duan… - Green Energy & …, 2020 - Elsevier
The sluggish kinetics of Fe (Ⅱ) recovery in Fenton/Fenton-like reactions significantly limits
the oxidation efficiency. In this study, we for the first time use boron carbide (BC) as a green …

Key role of persistent free radicals in hydrogen peroxide activation by biochar: implications to organic contaminant degradation

G Fang, J Gao, C Liu, DD Dionysiou… - Environmental …, 2014 - ACS Publications
We investigated the activation of hydrogen peroxide (H2O2) by biochars (produced from
pine needles, wheat, and maize straw) for 2-chlorobiphenyl (2-CB) degradation in the …