Sustainable Water Treatment: Harnessing Iron-Based Magnetic Biochar for Efficient Pollutant Removal

This study explores using iron-based magnetic biochar, derived from municipal sludge, as a catalyst for peroxymonosulfate in water treatment. The biochar demonstrates efficient pollutant removal through redox reactions and electron transfer, showcasing its potential for sustainable and eco-friendly solutions in wastewater treatment.

February 27, 2024

1–2 minutes

Zheng, Xu, et al (2024) Activation of peroxymonosulfate by sludge-derived magnetic biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More for pollutant removal: Performance, applicability, and synergetic mechanism of iron species and carboxylated biochar. *Chemical Engineering Journal.* https://doi.org/10.1016/j.cej.2024.149744

Developing eco-friendly, economical, and efficient catalytic systems for pollutant removal is imperative in water treatment. Municipal sludge conversion into multifunctional biochar is a feasible strategy for dual applicability in water treatment and sludge management. Ferric and biological sludge are recycled to synthesize iron-based biochar (Fe4SBC1-800) with magnetic separation properties.

The biochar serves as an efficient catalyst for peroxymonosulfate (PMS), promoting the elimination of pollutants like azo dyes and pharmaceuticals. The collaboration between carboxyl groups and sp2-C in the biochar efficiently activates PMS, while ≡Fe(II)/ZVI contributions play a role in redox activation and electron transfer. Electron-enriched ≡Fe(II) species further enhance oxygen reduction to form O2•−.

The Fe4SBC1-800/PMS system exhibits promising applicability in water treatment, showcasing enhanced degradation performance against diverse pollutants. This research marks a significant stride in eco-friendly water treatment, presenting a novel iron-based magnetic biochar catalyst. The study provides comprehensive insights into the activation mechanism and pollutant removal efficiency, contributing to sustainable solutions for water treatment and sludge management.