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https://hdl.handle.net/2440/126459
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Type: | Journal article |
Title: | Metal-free catalysts of graphitic carbon nitride-covalent organic frameworks for efficient pollutant destruction in water |
Author: | Yao, Y. Hu, Y. Hu, H. Chen, L. Yu, M. Gao, M. Wang, S. |
Citation: | Journal of Colloid and Interface Science, 2019; 554:376-387 |
Publisher: | Elsevier |
Issue Date: | 2019 |
ISSN: | 0021-9797 1095-7103 |
Statement of Responsibility: | Yunjin Yao, Yi Hua, Huanhuan Hu, Luwang Chen, Maojing Yu, Mengxue Gao, Shaobin Wang |
Abstract: | Novel metal-free catalysts via integration of covalent organic framework (COF) and graphitic carbon nitride (g-C3N4@COF) with a high graphitization degree and nitrogen content were fabricated and exhibited an outstanding activity in a wide pH range for peroxymonosulfate (PMS)-driven oxidation of refractory organic pollutants in water. Scanning electron microscopy images showed many aggregated COFs crystals anchored on the irregular g-C3N4 surface to form 3D structures. The precursors (urea, melamine, and dicyandiamide) of g-C3N4 determined the porous structures and properties of the g-C3N4@COF materials. The hybrids possessed superior reactivity in Orange II removal (100%) compared to pristine g-C3N4 (10%) and COF (5%), benefiting from high-temperature pyrolysis to generate crystal carbon and modulate nitrogen doping. Besides, removal efficiency of target pollutants depended on the oxidant dosages (0.33–1.30 mM), initial concentrations of organics (10–40 mg/L), temperatures (5–45 °C), pHs (1.72–10.3), and anions (Cl‾, SO⁴₂, NO‾₃, HCO‾₃, CO²₃‾ and HCOO‾). Quenching experiments and electron paramagnetic resonance demonstrated that non-radical singlet oxygen (1O2) was the dominant species for the oxidation of organic pollutants via electron transfer in the g-C3N4@COF/PMS system. It was inferred that the good balance between graphitization degree and nitrogen content benefited to enhancing the catalytic performance for the refractory pollutant degradation. The present investigation provides a new avenue for the design and construction of metal-free hybrid composites for environmental remediation. |
Keywords: | Carbon nitride; covalent organic framework; peroxymonosulfate; organic pollutant; synergistic effect |
Rights: | © 2019 Elsevier Inc. All rights reserved. |
DOI: | 10.1016/j.jcis.2019.07.0021 |
Grant ID: | http://purl.org/au-research/grants/arc/DP190103548 |
Appears in Collections: | Aurora harvest 8 Chemistry and Physics publications |
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