Published November 2, 2020 | Version v2
Working paper Open

Chromium speciation in Zr-based Metal-Organic Frameworks for environmental remediation

Authors/Creators

  • 1. BCMaterials, Ed. Martiana Casiano, Barrio Sarriena s/n, Leioa, Bizkaia, 48940, Spain
  • 2. Department Water, Environment and Sustainability, Advanced Mining Technology Center (AMTC), Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Av. Tupper 2007, Santiago, Chile
  • 3. Dept. of Organic Chemistry II, Science and Technology Faculty, University of the Basque Country (UPV/EHU), Barrio Sarriena s/n, Leioa, Bizkaia 48940.
  • 4. CEMHTI - UPR3079 CNRS, 1 avenue de la Recherche Scientifique, 45100 Orléans, France, France, Le Stusium Research Fellow, Loire Valley Institute for Advanced Studies, Orléans & Tours, France
  • 5. Dept. of Inorganic Chemistry, Universidad del País Vasco (UPV/EHU), Barrio Sarriena s/n, Leioa, Bizkaia, 48940, Spain
  • 6. Dept. of Mineralogy and Petrology, Universidad del País Vasco (UPV/EHU), Barrio Sarriena s/n, Leioa, Bizkaia, 48940, Spain

Description

Acute CrVI water pollution due to anthropogenic activities is an increasing worldwide concern. The high toxicity and mobility of CrVI makes necessary to develop dual adsorbent/ion-reductive materials able to capture CrVI and transform it efficiently to less hazardous CrIII. The accurate description of the chromium speciation at the adsorbent/ion-reductive matrix is key to assess whether CrVI is completely reduced to CrIII or if an incomplete transformation leds to the stabilization of highly reactive CrV transient species within the material. With this goal in mind, a dual ultraviolet visible and electron paramagnetic spectroscopy approach has been applied to determine the chromium speciation within Zr-based metal-organic frameworks (MOFs). Our findings point out that the generation of defect positions at Zr-MOFs boost CrVI adsorption, whilst the presence of reductive groups at the organic linkers play a key role to stabilize CrIII as isolated and/or clustered ions.

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Additional details

Funding

European Commission
INDESMOF - International Network on Ionic Liquid Deep Eutectic Solvent Based Metal Organic Frameworks Mixed Matrix Membranes. 778412