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OPTIMISING THE TRANSPORT PROPERTIES AND REACTIVITY OF MICROBIALLY SYNTHESISED MAGNETITE FOR IN SITU REMEDIATION
Joshi, N., F. Liu, M.P. Watts, H. Williams, V.S. Coker, D. Schmid, T. Hofmann, and J.R. Lloyd.
Scientific Reports 8:4246 (2018)

Microbially synthesized nanoscale magnetite, prepared from Fe(III) oxides by subsurface Fe(III)-reducing bacteria, offers a scalable biosynthesis route to a nanoscale remediation reagent. Batch and column experiments were conducted to assess and optimize the transport and reactivity of the particles in porous media. Collectively, the experiments showed that non-toxic, low-cost coatings such as guar gum and salts of humic acid can be used to enhance the mobility of the nanomaterial while maintaining reactivity against target contaminants. Bionanomagnetite (BNM) reactivity also was enhanced by the addition of surface coatings of nano-Pd, which extended the operational lifetime of the BNM in the presence of a simple electron donor, such as hydrogen or formate. https://www.nature.com/articles/s41598-018-21733-y



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