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

Abstract

Development of environmentally friendly materials for efficient pollutant removal is crucial. In this work, a new one-pot green-synthesis of iron-based materials with a reductive/adsorption potential 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 a ferric reducing bacteria consortium (FRB), and their structures were extensively characterized by Mössbauer spectroscopy, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Moreover, the microbial community in the consortium was assessed. Results indicated that BioFe-based materials presented dispersed cubic baricite microparticles containing Fe(II) and Ca2+ in their structure, making them ideal for Cr(VI) remediation. The removal efficiency of Cr(VI) from water by a combination of reduction and adsorption processes using the synthesized materials was evaluated through kinetics experiments. The removal of total chromium was more efficient using supported BioFe than using unsupported BioFe and no dependence with dissolved O2 was detected. The preparation of iron particles with excellent chromium removal performance by a new biobased synthesis could lead to a low-cost and environmentally friendly remediation technology.

Superstable Mineralization Coupled with Photocatalysis toward Cr(VI) Remediation Using Layered Double Hydroxide Material

“…Adsorption is considered an exceptionally effective strategy for eliminating Cr­(VI) for its ease of operation, high treatment efficiency, and large adsorption capacity. , In recent years, various adsorbent materials have been utilized to treat heavy metal pollution, including activated carbon, mineral materials, zeolites, etc. However, these materials often exhibit weak binding forces and low adsorption efficiencies, resulting in a potential second pollution, thus restricting their application in the industry.…”