Colloidal stability of nanoparticles derived from simulated cloud-processed mineral dusts

Sergio Calabrese, Enikö Kadar, Andrew Fisher, Zongbo Shi, Jamie Lead, Eugenia Valsami-Jones, Björn Stolpe

Risultato della ricerca: Articlepeer review

11 Citazioni (Scopus)

Abstract

Laboratory simulation of cloud processing of three model dust types with distinct Fe-content (Moroccan dust, Libyan dust and Etna ash) and reference goethite and ferrihydrite were conducted in order to gain a better understanding of natural nanomaterial inputs and their environmental fate and bioavailability. The resulting nanoparticles (NPs)were characterized for Fe dissolution kinetics, aggregation/size distribution, micromorphology and colloidal stability of particle suspensions using a multi-method approach. We demonstrated that the: (i) acid-leachable Fe concentration was highest in volcanic ash (1 mMg−1 dust) and was followed by Libyan and Moroccan dust with an order of magnitude lower levels; (ii) acid leached Fe concentration in the b20 nm fraction was similar in samples processed in the dark with those under artificial sunlight, but average hydrodynamic diameter of NPs after cloud-processing (pH ~ 6) was larger in the former; iii) NPs formed at pH ~ 6 were smaller and less poly-disperse than those at low pH, whilst unaltered zeta potentials indicated colloidal instability; iv) relative Fe percentage in the finer particles derived from cloud processing does not reflect Fe content of unprocessed dusts (e.g. volcanic ash N Libyan dust).
Lingua originaleEnglish
pagine (da-a)864-870
Numero di pagine7
RivistaScience of the Total Environment
Volume466-467
Stato di pubblicazionePublished - 2014

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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