Copper-loaded sustainable MOFs as photocatalysts for dye removal
This work presents the effect of Cu loading, using incipient wetness impregnation method, on sustainably synthesized MIL-100(Fe), NH2-MIL-53(Al), Zr-BDC and NH2-Zr-BDC MOFs and their photocatalytic removal efficiency on target dye, rhodamine B (RhB), from aqueous solutions. Several Cu ratios have be...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/389818 |
| Acceso en línea: | http://hdl.handle.net/10261/389818 https://api.elsevier.com/content/abstract/scopus_id/85196843876 |
| Access Level: | acceso abierto |
| Palabra clave: | Cu loaded MOFs Incipient wetness impregnation NH -Zr-BDC 2 Photoluminescence Rhodamine B removal |
| Sumario: | This work presents the effect of Cu loading, using incipient wetness impregnation method, on sustainably synthesized MIL-100(Fe), NH2-MIL-53(Al), Zr-BDC and NH2-Zr-BDC MOFs and their photocatalytic removal efficiency on target dye, rhodamine B (RhB), from aqueous solutions. Several Cu ratios have been tested, finding that 2 wt% of Cu load becomes optimum in terms of metal distribution and catalytic performance. Powder X-ray diffraction patterns (XRD) showed no difference from the parent supports in the case of MIL-100(Fe), NH2-MIL-53(Al) and Zr-BDC, whereas extra peaks are induced by Cu impregnation in NH2-Zr-BDC. In addition, several techniques indicate that Cu strongly interacts with the MOF in Cu@NH2-Zr-BDC, exhibiting the lowest bandgap of the series, the lowest photoluminescence intensity and a notable predominance of Cu in the oxidation state 2+. The above evidences lead Cu@NH2-Zr-BDC to behave as the most effective catalyst in the removal of RhB, reaching removal efficiency as high as 93 %, being able to efficiently and selectively remove basic dyes from mixed samples, such as RhB and MB, but not for acidic dyes like MO, and also showing a very good performance (46 % photodegradation) in real waste water from Hawassa textile factory, in Ethiopia. Moreover, this catalyst can be recycled 3 times by simple washing and drying. Scavengers test suggested that h+ is the most active species in the photocatalytic degradation. |
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