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Preparation of nZVI embedded modified mesoporous carbon for catalytic persulfate to degradation of reactive black 5 |
Zhifei Ma1, Huali Cao1, Fengchun Lv2, Yu Yang2, Chen Chen2, Tianxue Yang2, Haixin Zheng1, Daishe Wu1( ) |
1. Key Laboratory of Poyang Lake Environment and Resource Utilization (Ministry of Education), School of Resources Environmental & Chemical Engineering, Nanchang University, Nanchang 330031, China 2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China |
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Abstract • The MCNZVI is prepared as an interesting material for PS activation. • Graphitized carbon shells facilitate electron transfer from Fe0. • The MCNZVI exhibits excellent performance to degrade RB5 by 1O2. • The MCNZVI has high stability and reusability in the oxidation system. High-efficiency and cost-effective catalysts with available strategies for persulfate (PS) activation are critical for the complete mineralization of organic contaminants in the environmental remediation and protection fields. A nanoscale zero-valent iron-embedded modified mesoporous carbon (MCNZVI) with a core-shell structure is synthesized using the hydrothermal synthesis method and high-temperature pyrolysis. The results showed that nZVI could be impregnated within mesoporous carbon frameworks with a comparatively high graphitization degree, rich nitrogen doping content, and a large surface area and pore volume. This material was used as a persulfate activator for the oxidation removal of Reactive Black 5 (RB5). The effects of the material dosage, PS concentration, pH, and some inorganic anions (i.e., Cl−, SO42−) on RB5 degradation were then investigated. The highest degradation efficiency (97.3%) of RB5 was achieved via PS (20 mmol/L) activation by the MCNZVI (0.5 g/L). The pseudo-first-order kinetics (k = 2.11 × 10−2 min−1) in the MCNZVI/PS (0.5 g/L, 20 mmol/L) was greater than 100 times than that in the MCNZVI and PS. The reactive oxygen species (ROS), including 1O2, SO4·−, HO·, and ·O2−, were generated by PS activation with the MCNZVI. Singlet oxygen was demonstrated to be the primary ROS responsible for the RB5 degradation. The MCNZVI could be reused and regenerated for recycling. This work provides new insights into PS activation to remove organic contamination.
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Keywords
MCNZVI
Core-shell structure
Reactive Black 5
Persulfate
Mechanism
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Corresponding Author(s):
Daishe Wu
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Issue Date: 12 January 2021
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