Metal-organic frameworks-derived CoFeN-NC materials with the enhanced catalytic activity and selectivity for the degradation of organic dyes via adsorption and heterogeneous photo-Fenton
Possible schematic illustration of photocatalytic degradation of organic dyes under visible light. [Display omitted] •MOFs derived cobalt iron bimetallic catalysts (CoxFe1-xN-NCs) were fabricated via self-assembly and annealing treatment.•Co0.8Fe0.2N-NC exhibited excellent adsorption and photo-Fento...
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Published in | Applied surface science Vol. 601; p. 154028 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.11.2022
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Subjects | |
Online Access | Get full text |
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Summary: | Possible schematic illustration of photocatalytic degradation of organic dyes under visible light.
[Display omitted]
•MOFs derived cobalt iron bimetallic catalysts (CoxFe1-xN-NCs) were fabricated via self-assembly and annealing treatment.•Co0.8Fe0.2N-NC exhibited excellent adsorption and photo-Fenton synergistic effect in the degradation of organic dyes.•Co0.8Fe0.2N-NC had obvious selective degradation toward non-azo dyes.•Co0.8Fe0.2N-NC displayed favorable stability characteristics.•The active species were determined and a possible photo-Fenton degradation mechanism was proposed.
Nanoscale iron-based materials are widely used as photocatalytic materials for catalytic oxidative degradation of organic dyes in water. Here, a series of MOFs derived nitrogen doped cobalt iron bimetallic carbon composite nanomaterials (CoxFe1-xN-NCs) were prepared by self-assembly and annealing treatment, and their application in the removal of organic dyes in water was investigated by the synergistic effect of adsorption and photo-Fenton. The study found that the Co0.8Fe0.2N-NC exhibit superior catalytic performance for different types of organic dyes. For example, when the concentration of MB was 40 mg L-1, the degradation rate constant was 3.88 × 10-2 min−1, which were 2.9 and 25.2 times the corresponding values of the Fenton-like and photocatalytic system, respectively. Meanwhile, compared with azo dyes Methyl Orange and Congo Red (MO and CR), Co0.8Fe0.2N-NC has obvious selective catalysis for non-azo dyes Methylene Blue, Malachite Green, Rhodamine B and Neutral Red (MB, MG, RhB and NR). Moreover, the reaction of cobalt iron active centers with hydrogen peroxide (H2O2) further promotes the generation of active substances (·OH, ·O2– and h+), speeding up the degradation of organic dyes. These results suggest that the synergistic effect of adsorption and photo-Fenton may provide new clues for the treatment of organic pollutants in wastewater. |
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ISSN: | 0169-4332 1873-5584 |
DOI: | 10.1016/j.apsusc.2022.154028 |