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Advisor(s)
Abstract(s)
The interest in zero-valent iron nanoparticles has been increasing significantly since the development of a
green production method in which extracts from natural products or wastes are used. However, this field
of application is yet poorly studied and lacks knowledge that allows the full understanding of the production
and application processes.
The aim of the present work was to evaluate the viability of the utilization of several tree leaves to produce extracts
which are capable of reducing iron(III) in aqueous solution to form nZVIs. The quality of the extracts was
evaluated concerning their antioxidant capacity. The results show that: i) dried leaves produce extracts with
higher antioxidant capacities than non-dried leaves, ii) the most favorable extraction conditions (temperature,
contact time, and volume:mass ratio) were identified for each leaf, iii) with the aim of developing a green, but
also low-cost,method waterwas chosen as solvent, iv) the extracts can be classified in three categories according
to their antioxidant capacity (expressed as Fe(II) concentration): >40 mmol L−1; 20–40 mmol L−1; and
2–10 mmol L−1; with oak, pomegranate and green tea leaves producing the richest extracts, and v) TEManalysis
proves that nZVIs (d=10–20 nm) can be produced using the tree leaf extracts.
Description
Keywords
Zero-valent iron nanoparticles Green production Antioxidant capacity Waste valorization Natural products
Citation
Publisher
Elsevier