期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 600, 期 -, 页码 449-462出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.05.044
关键词
MnCo2O4 nanoparticle; Ultrathin g-C3N4 nanosheets; Peroxymonosulfate; Photocatalysis; Radical reaction mechanism; Degradation intermediates
资金
- National Natural Science Foundation of China [U20A20322, 51678270]
- 111 Project of Jilin University, China [B16020]
Manganese cobaltate nanoparticles anchored on graphitic carbon nitride flakes were prepared and showed high PMS activation efficiency under visible light, degrading tetracycline hydrochloride. The composite catalysts exhibited good stability, cycling capability, and cation/anion tolerance, with a proposed degradation mechanism and reaction pathways based on reactive species and degradation products.
Peroxymonosulfate (PMS) activation by heterogeneous transition metal oxides is an effective approach for treating emerging pollutants in water. However, the low PMS activation efficiency associated with the valency conversion rate of transition metals has been a major challenge to sulfate radical-based oxidation. In this work, manganese cobaltate (MnCo2O4) nanoparticles anchored on graphitic carbon nitride (g-C3N4) flakes (MnCo2O4/g-C3N4) were successfully prepared and showed high PMS activation efficiency under visible (Vis) light. The obtained catalysts degraded 96.1% of the tetracycline hydrochloride (TCH) through the synergistic effect of PMS and photocatalysis. The reaction rate constant (0.2505 min(-1)) was 5.3 and 1.8 times higher in the MnCo2O4/g-C3N4/PMS/Vis system than in the pristine g-C3N4 (0.0471 min(-1)) and MnCo2O4 (0.1435 min(-1)) systems, respectively. The characterization results verified that g-C3N4, which functions as the electron donor in the photocatalytic heterojunction system, could transmit numerous photogenerated electrons to MnCo2O4, thereby increasing the cyclability of divalent-trivalent metal ions. The composites also showed good stability, cycling capability, and cation/anion tolerance. Tentative degradation mechanism and reaction pathways were proposed based on the reactive species and degradation products. (C) 2021 Elsevier Inc. All rights reserved.
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