Surface controlled generation of reactive radicals from persulfate by carbocatalysis on nanodiamonds

Duan, Xiaoguang, Su, Chao, Zhou, Li, Sun, Hongqi, Suvorova, Alexandra, Odedairo, Taiwo, Zhu, Zhonghua, Shao, Zongping and Wang, Shaobin (2016) Surface controlled generation of reactive radicals from persulfate by carbocatalysis on nanodiamonds. Applied Catalysis B: Environmental, 194 7-15. doi:10.1016/j.apcatb.2016.04.043

Author Duan, Xiaoguang
Su, Chao
Zhou, Li
Sun, Hongqi
Suvorova, Alexandra
Odedairo, Taiwo
Zhu, Zhonghua
Shao, Zongping
Wang, Shaobin
Title Surface controlled generation of reactive radicals from persulfate by carbocatalysis on nanodiamonds
Journal name Applied Catalysis B: Environmental   Check publisher's open access policy
ISSN 0926-3373
Publication date 2016-10-05
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.apcatb.2016.04.043
Open Access Status Not Open Access
Volume 194
Start page 7
End page 15
Total pages 9
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Production of radicals by metal-free catalysis is expected to offer a promising oxidative reaction for remediation of emerging contaminants. In this study, novel metal-free activation of persulfate (PS) on annealed nanodiamonds (ANDs) was investigated, which demonstrated superior performances in decomposition of various pollutants to conventional metal-based catalysis. Comprehensive investigations on the effects of reaction parameters, such as solution pH, reaction temperature, initial phenol concentration, catalyst loading, PS usage, the presence of chlorine ions and humic acid, on phenol degradation were carried out. In addition, nanodiamond (ND) material optimization and reusability were also studied. Electron paramagnetic resonance (EPR) and selective organic degradation unraveled that the PS/AND system may produce both hydroxyl radicals (radical dotOH) and sulfate radicals (SO4radical dot−), initialized from oxidizing water molecules on the nanodiamond surface. The carbocatalysts served as an excellent electron tunnel to facilitate the charge transfer from water or hydroxide ions to PS, and the oxidized intermediates may play a crucial role in PS activation. Electrochemical analyses in PS oxidant solution and oxygen reduction reaction (ORR) were carried out to understand Osingle bondO bond activation by the metal-free catalysis. This study provides an environmentally benign and highly efficient oxidative reaction system with reactive radicals along with insights into the metal-free PS activation process.
Keyword Heterogeneous catalysis
Annealed nanodiamond
Hydroxyl radicals
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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