Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 15, Pages 9710-9720Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b01175
Keywords
catalytic ozonation; reduced graphene oxide; surface carbonyl groups; p-hydroxylbenzoic acid; superoxide radical
Funding
- National Natural Science Foundation of China [21207133]
- National Science Fund for Distinguished Young Scholars of China [51425405]
Ask authors/readers for more resources
Nanocarbons have been demonstrated as promising environmentally benign catalysts for advanced oxidation processes (AOPs) upgrading metal-based materials. In this study, reduced graphene oxide (rGO) with a low level of structural defects was synthesized via a scalable method for catalytic ozonation of p-hydroxylbenzoic acid (PHBA). Metal free rGO materials were found to exhibit a superior activity in activating ozone for catalytic oxidation of organic phenolics. The electron-rich carbonyl groups were identified as the active sites for the catalytic reaction. Electron spin resonance (ESR) and radical competition tests revealed that superoxide radical (O-center dot(2)-) and singlet oxygen (O-1(2)) were the reactive oxygen species (ROS) for PHBA degradation. The intermediates and the degradation pathways were illustrated from mass spectroscopy. It was interesting to observe that addition of NaCI could enhance both ozonation and catalytic ozonation efficiencies and make O-center dot(2)- as the dominant ROS. Stability of the catalysts was also evaluated by the successive tests. Loss of specific surface area and changes in the surface chemistry were suggested to be responsible for catalyst deactivation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available