Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 586, Issue -, Pages 551-562Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.10.120
Keywords
N-doped nanocarbons; Metal-free catalyst; Bisphenol A; Structure-composition-activity relationships; Superoxide anion radical
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Funding
- National Natural Science Foundation of China (NSFC) [51779088, 51709104]
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A novel in-situ N-doped carbon nanoparticles were prepared from N-rich polyaniline and used as metal-free peroxydisulfate activator for efficient bisphenol A degradation. The catalytic activity of NCNs was closely related to their structure-composition, with higher graphitic N content and larger BET surface area being beneficial for the generation of reactive oxygen species.
A novel in-situ N-doped carbon nanoparticles (NCNs) was prepared through direct pyrolysis of N-rich polyaniline (PANI) without using external N-containing precursor and the as-prepared materials were employed as metal-free peroxydisulfate (PDS) activator for bisphenol A (BPA) degradation. The catalyst derived from PANI carbonization at 900 degrees C (NCNs-9) displayed the excellent catalytic activity to activate PDS, resulting in 96.0% BPA degradation efficiency within 20 min. The catalytic activity of NCNs was closely related to their structure-composition, and higher graphitic N content and larger BET surface area were beneficial to the generation of reactive oxygen species (ROS). The quenching tests and electron paramagnetic resonance (EPR) demonstrated that BPA degradation in PDS/NCNs system was accomplished via non-radical (O-1(2)) and radical ((center dot)center dot OH, SO4 center dot, and O-2 center dot) pathways, in which O-2 center dot was the main ROS. The origin of O-2 was the conversion of dissolved oxygen and the activation of PDS. The possible degradation pathways of BPA were also proposed. This study might provide inspirations to design in-situ N-doped carbon nanoparticles as the PDS activator for efficient degradation of persistent organic compound via advanced oxidation processes (AOPs). (C) 2020 Elsevier Inc. All rights reserved.
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