Heterogeneous persulfate activation by mesoporous Pd/FexOy nanocatalysts for the rapid degradation of Rhodamine B
Nanocatalysts prepared by immobilizing Pd nanoparticles on mesoporous iron oxides (ferrihydrite, goethite and α-hematite) were used in persulfate activation for the rapid oxidative degradation of an organic dye, Rhodamine B. Pd nanoparticles were prepared by dendrimer encapsulation and were then imm...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-10-01
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| Series: | Applied Catalysis O: Open |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2950648425000434 |
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| Summary: | Nanocatalysts prepared by immobilizing Pd nanoparticles on mesoporous iron oxides (ferrihydrite, goethite and α-hematite) were used in persulfate activation for the rapid oxidative degradation of an organic dye, Rhodamine B. Pd nanoparticles were prepared by dendrimer encapsulation and were then immobilized on the three iron oxide supports by wet impregnation. The Pd nanoparticles were seen to be on the surface of mono-dispersed iron oxide nanoparticle aggregates as characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The nanomaterials were active catalysts for the rapid oxidation of the organic dye Rhodamine B with persulfate as the oxidant in a Fenton-like mechanism. Under optimized conditions Pd on ferrihydrite was the most active catalyst followed by Pd/α-hematite then Pd/goethite. The activation energies (EA) were 43.3 kJ·mol−1, 98.6 kJ·mol−1 and 75.1 kJ·mol−1 for Pd/ferrihydrite, Pd/α-hematite and Pd/goethite, respectively, correlating with the observed order of activity. The reaction followed Langmuir-Hinshelwood kinetics with surface rate constants of k = 3.35 × 10−5 mol·m−2·s−1, 1.55 × 10−5 mol·m−2·s−1 and 2.80 × 10−5 mol·m−2·s−1 for the three catalysts, respectively. |
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| ISSN: | 2950-6484 |