One-Pot Green-Synthesis of Supported Reductive Biogenic Iron-Based Materials for the Removal of Cr(VI)

PARONETTO, GABRIELA S.; OLIVELLI, MELISA S.; MONTES, MARÍA L.; FERNÁNDEZ, MARIELA A.; DELFOSSE, VERÓNICA C.; MARCO-BROWN, JOSE L.; CANDAL, ROBERTO

INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH

AMER CHEMICAL SOC

Lugar: Washington; Año: 2024 vol. 63 p. 1893 - 1902

0888-5885

Development of environmentally friendly materials for efficient pollutants removal is crucial. Inthis work, a new one-pot green-synthesis of iron-based materials with reductive/adsorptionpotential was developed and tested for remediation of Cr(VI) in water. Biogenic iron particles(BioFe) and BioFe supported on raw montmorillonite (BioFe-MMT) were synthesized using aferric reducing bacteria consortium (FRB), and their structures were extensively characterized byMössbauer spectroscopy, X-ray diffraction, scanning electron microscopy and energy-dispersiveX-ray. Moreover, the microbial community in the consortium was assessed. Results indicatedthat BioFe-based materials presented dispersed cubic baricite micro-particles containing Fe(II)and Ca 2+ in their structure, making them ideal for Cr(VI) remediation. The removal efficiency ofCr(VI) from water by a combination of reduction and adsorption processes using the synthesizedmaterials was evaluated through kinetics experiments. The removal of total chromium was moreefficient using supported BioFe than using un-supported BioFe and no dependence withdissolved O 2 was detected. The preparation of iron particles with excellent chromium removalperformance by a new bio-based synthesis could lead to a low-cost and environmentally-friendlyremediation technology.