Efficient As(III) oxidation and removal by encapsulated BioMnOx@Fh with ferrihydrite-promoted Mn regeneration
Abstract
Arsenic contamination, particularly the more toxic and mobile As(III), poses a significant threat to water safety. Although manganese oxides can oxidize As(III), their application is often limited by surface passivation and poor regeneration. Here, we synthesized a bio-hybrid material, BioMnOx@Fh, via Mn(II) oxidation by Pseudomonas putida MnB1 in the presence of ferrihydrite (Fh), and evaluated its performance for As(III) oxidation and removal. Compared with BioMnOx alone, BioMnOx@Fh showed a higher Mn(IV) fraction (39.6% vs. 27.9%) and faster As(III) oxidation (kox = 0.18 ± 0.04 h−1 vs. 0.080 ± 0.013 h−1), and 90.31 ± 2.11% dissolved total As removal under the tested conditions. Relative to abiotic MnOx@Fh, the biogenic composite showed lower Mn(II) release and more sustained redox reactivity, consistent with biologically maintained Mn redox cycling. Fh functioned not only as a sorptive iron phase, but was also associated with the enhanced regeneration of reactive high-valence Mn species. Together, the results are consistent with a coupled treatment process in which the Fh-containing phase promotes arsenic retention, whereas the biogenic Mn oxide phase sustains oxidative transformation of As(III). Alginate encapsulation further improved material recoverability and supported short-term reuse of the composite. These results suggest that coupling ferrihydrite with biologically active Mn oxides, combined with material encapsulation, is a promising strategy for As(III) treatment.
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BibTeX
@article{zhang2026efficient,
title = {{Efficient As(III) oxidation and removal by encapsulated BioMnOx@Fh with ferrihydrite-promoted Mn regeneration}},
author = {Feng Zhang and Huilin Yin and Stanislav Jelavić and Bruno Lanson and Xiaoming Wang and Hui Yin and Wenfeng Tan and Xionghan Feng},
journal = {Chemical Engineering Journal},
year = {2026},
month = jun,
doi = {10.1016/j.cej.2026.176560},
url = {https://insu.hal.science/insu-05795890v1},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - JOUR
TI - Efficient As(III) oxidation and removal by encapsulated BioMnOx@Fh with ferrihydrite-promoted Mn regeneration
AU - Feng Zhang
AU - Huilin Yin
AU - Stanislav Jelavić
AU - Bruno Lanson
AU - Xiaoming Wang
AU - Hui Yin
AU - Wenfeng Tan
AU - Xionghan Feng
PY - 2026
DA - 2026/06/15
JO - Chemical Engineering Journal
DO - 10.1016/j.cej.2026.176560
UR - https://insu.hal.science/insu-05795890v1
AB - Arsenic contamination, particularly the more toxic and mobile As(III), poses a significant threat to water safety. Although manganese oxides can oxidize As(III), their application is often limited by surface passivation and poor regeneration. Here, we synthesized a bio-hybrid material, BioMnOx@Fh, via Mn(II) oxidation by Pseudomonas putida MnB1 in the presence of ferrihydrite (Fh), and evaluated its performance for As(III) oxidation and removal. Compared with BioMnOx alone, BioMnOx@Fh showed a higher Mn(IV) fraction (39.6% vs. 27.9%) and faster As(III) oxidation (kox = 0.18 ± 0.04 h−1 vs. 0.080 ± 0.013 h−1), and 90.31 ± 2.11% dissolved total As removal under the tested conditions. Relative to abiotic MnOx@Fh, the biogenic composite showed lower Mn(II) release and more sustained redox reactivity, consistent with biologically maintained Mn redox cycling. Fh functioned not only as a sorptive iron phase, but was also associated with the enhanced regeneration of reactive high-valence Mn species. Together, the results are consistent with a coupled treatment process in which the Fh-containing phase promotes arsenic retention, whereas the biogenic Mn oxide phase sustains oxidative transformation of As(III). Alginate encapsulation further improved material recoverability and supported short-term reuse of the composite. These results suggest that coupling ferrihydrite with biologically active Mn oxides, combined with material encapsulation, is a promising strategy for As(III) treatment.
SN - 1385-8947
ER -