Nanoparticles with photoinduced precipitation for the extraction of pollutants from water and soil
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2015
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Nanotechnology may offer fast and effective solutions for environmental clean-up. Herein,
amphiphilic diblock copolymers are used to develop a platform of photosensitive core-shell
nanoparticles. Irradiation with ultraviolet light removes the protective layer responsible for
colloidal stability; as a result, the nanoparticles are rapidly and irreversibly converted to
macroscopic aggregates. The associated phase separation allows measuring the partitioning
of small molecules between the aqueous phase and nanoparticles; data suggests that
interactions are enhanced by decreasing the particle size. Adsorption onto nanoparticles can
be exploited to efficiently remove hydrophobic pollutants from water and contaminated soil.
Preliminary in vivo experiments suggest that treatment with photocleavable nanoparticles can
significantly reduce the teratogenicity of bisphenol A, triclosan and 17a-ethinyl estradiol
without generating obviously toxic byproducts. Small-scale pilot experiments on wastewater,
thermal printing paper and contaminated soil demonstrate the applicability of the approach.
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BRANDL, Ferdinand et al. Nanoparticles with photoinduced precipitation for the extraction of pollutants from water and soil. Nature Communications, Heidelberg, v. 6, n. 7765, p. 1-10, 2015.