CoFe₂O₄ prepared from cobalt-doped coal-gangue-leached iron as an effective peroxymonosulfate activator to degrade rhodamine B: preparation, application and degradation mechanism.
- 1School of Civil Engineering and Urban Planning, Liupanshui Normal University Liupanshui 553004 China.
- 2School of Chemistry and Materials Engineering, Liupanshui Normal University Liupanshui 553004 Guizhou China [email protected] [email protected].
Abstract
The typical organic dye rhodamine B (RhB), which poses a serious threat to freshwater safety, could be effectively eliminated via an advanced oxidation technology based on peroxymonosulfate (PMS). Developing efficient catalysts is the key to this process. Herein, CoFe₂O₄ (CFO) catalysts were synthesized via co-precipitation, hydrothermal, and sol-gel methods using an activated acid leaching/extracting/back-extracting process to recover iron from coal gangue as the Fe source and chemically pure cobalt chloride hexahydrate as the cobalt source. The prepared catalysts were applied as a high-efficiency activator of PMS for RhB degradation. As a result, the CFO catalyst prepared by the co-precipitation method could essentially achieve a degradation efficiency of 99.38% for RhB within 20 min; the optimal reaction parameters were a reaction temperature of 20 °C, catalyst concentration of 0.2 g L⁻¹, dye concentration of 30 mg L⁻¹, initial pH of 7, and PMS concentration of 0.7 g L⁻¹. A series of characterizations demonstrated that the catalyst had a large specific surface area, a rich pore structure, and excellent magnetic properties. Combined with radical quenching experiments, EPR and XPS, a possible PMS mechanism was proposed. ¹O₂ was the main active substance for the catalytic system, and SO₄ ⁻ and ˙OH were also produced during the PMS activation process. The work not only provides a valuable reference for the high-value utilization of high-iron coal gangue but also lays the foundation for the wet leaching of iron from coal gangue to prepare efficient PMS activators for treating organic dye wastewater.
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BibTeX
@article{zhang2026cofe₂o₄,
title = {{CoFe₂O₄ prepared from cobalt-doped coal-gangue-leached iron as an effective peroxymonosulfate activator to degrade rhodamine B: preparation, application and degradation mechanism.}},
author = {Mingxian Zhang and Ying He and Deshun Kong and Jinsong Du and Xuemei Zheng and Aiyuan Ma},
journal = {RSC advances},
year = {2026},
month = oct,
doi = {10.1039/d6ra07410c},
url = {https://europepmc.org/article/MED/42840851},
note = {CC BY-NC},
}
RIS
TY - JOUR
TI - CoFe₂O₄ prepared from cobalt-doped coal-gangue-leached iron as an effective peroxymonosulfate activator to degrade rhodamine B: preparation, application and degradation mechanism.
AU - Mingxian Zhang
AU - Ying He
AU - Deshun Kong
AU - Jinsong Du
AU - Xuemei Zheng
AU - Aiyuan Ma
PY - 2026
DA - 2026/10/06
JO - RSC advances
DO - 10.1039/d6ra07410c
UR - https://europepmc.org/article/MED/42840851
AB - The typical organic dye rhodamine B (RhB), which poses a serious threat to freshwater safety, could be effectively eliminated via an advanced oxidation technology based on peroxymonosulfate (PMS). Developing efficient catalysts is the key to this process. Herein, CoFe₂O₄ (CFO) catalysts were synthesized via co-precipitation, hydrothermal, and sol-gel methods using an activated acid leaching/extracting/back-extracting process to recover iron from coal gangue as the Fe source and chemically pure cobalt chloride hexahydrate as the cobalt source. The prepared catalysts were applied as a high-efficiency activator of PMS for RhB degradation. As a result, the CFO catalyst prepared by the co-precipitation method could essentially achieve a degradation efficiency of 99.38% for RhB within 20 min; the optimal reaction parameters were a reaction temperature of 20 °C, catalyst concentration of 0.2 g L⁻¹, dye concentration of 30 mg L⁻¹, initial pH of 7, and PMS concentration of 0.7 g L⁻¹. A series of characterizations demonstrated that the catalyst had a large specific surface area, a rich pore structure, and excellent magnetic properties. Combined with radical quenching experiments, EPR and XPS, a possible PMS mechanism was proposed. ¹O₂ was the main active substance for the catalytic system, and SO₄ ⁻ and ˙OH were also produced during the PMS activation process. The work not only provides a valuable reference for the high-value utilization of high-iron coal gangue but also lays the foundation for the wet leaching of iron from coal gangue to prepare efficient PMS activators for treating organic dye wastewater.
SN - 2046-2069
ER -