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Magnetic nanoparticle recovery device (MagNERD) enables application of iron oxide nanoparticles for water treatment

An optimized permanent magnetic nanoparticle recovery device (i.e., the MagNERD) was developed and operated to separate, capture, and reuse superparamagnetic Fe 3 O 4 from treated water in-line under continuous flow conditions. Experimental data and computational modeling demonstrate how the MagNERD...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2020, Vol.22 (2), Article 48
Main Authors: Powell, Camilah D., Atkinson, Ariel J., Ma, Yizhao, Marcos-Hernandez, Mariana, Villagran, Dino, Westerhoff, Paul, Wong, Michael S.
Format: Article
Language:English
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Summary:An optimized permanent magnetic nanoparticle recovery device (i.e., the MagNERD) was developed and operated to separate, capture, and reuse superparamagnetic Fe 3 O 4 from treated water in-line under continuous flow conditions. Experimental data and computational modeling demonstrate how the MagNERD’s efficiency to recover nanoparticles depends upon reactor configuration, including the integration of stainless-steel wool around permanent magnets, hydraulic flow conditions, and magnetic NP uptake. The MagNERD efficiently removes Fe 3 O 4 in the form of a nanopowder, up to > 95% at high concentrations (500 ppm), under scalable and process-relevant flow rates (1 L/min through a 1.11-L MagNERD reactor), and in varying water matrices (e.g., ultrapure water, brackish water). The captured nanoparticles were recoverable from the device using a simple hydraulic backwashing protocol. Additionally, the MagNERD removed ≥ 94% of arsenic-bound Fe 3 O 4 , after contacting As-containing simulated drinking water with the nanopowder. The MagNERD emerges as an efficient, versatile, and robust system that will enable the use of magnetic nanoparticles in larger scale water treatment applications. Graphical abstract To aid potable water treatment, a magnetic nanoparticle recovery device (MagNERD) containing removable permanent magnets was optimized and operated to capture superparamagnetic nanoparticles from polluted water in-line under flow conditions.
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-020-4770-4