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Updated: Aug 30, 2026

Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for Cu(II) Through Microwave Pre-Pyrolysis
Published on: February 12, 2019
Bifunctional N/O-doped porous carbons:Electron localization enables efficient adsorption and electron delocalization
Mingwei Yang1, Maoguo Tan1, Denghong Zhao1
1Key Laboratory of Catalysis Science and Technology of Chongqing Education Commission, Chongqing Key Laboratory of Catalysis and New Environmental Materials, Chongqing Technology and Business University, Chongqing 400067, P.R. China.
Abstract:
Microwave pyrolysis combined with a doping strategy was adopted to precisely regulate the electronic state of carbon materials, thus constructing N-doped porous carbon material CN2 and porous O-doped carbon material CO2, which respectively realized efficient adsorption of TC and TC degradation via PMS activation. This study aims at endowing materials with differentiated functions through doping-induced electron localization/delocalization characteristics. CN2, with its large specific surface area and abundant pyrrolic N active sites formed by N doping, enhanced the π-π interaction with TC via the N-C electron localization effect. The maximum adsorption capacity reached 439 mg/g within 30 min, and kinetic and thermodynamic analyses showed that the adsorption process was dominated by chemical adsorption mediated by π-π interaction. CO2 was rich in C=O groups, and its conjugate system promoted electron delocalization, making C=O sites efficient centers for PMS adsorption and activation. The CO2/PMS system achieved 100% TC removal in 30 min, with a degradation rate constant of 0.148 min-1. DFT calculations clarified the intrinsic mechanism by which electron localization/delocalization regulated the adsorption/degradation performance of the materials. Combined with quenching experiments and EPR tests, it was verified that degradation of TC by CO2 followed a 1O2 non-radical pathway dominated by C=O sites.
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