Abstract
| Lingua originale | English |
|---|---|
| pagine (da-a) | 864-870 |
| Numero di pagine | 7 |
| Rivista | Science of the Total Environment |
| Volume | 466-467 |
| Stato di pubblicazione | Published - 2014 |
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All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal
- Pollution
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Colloidal stability of nanoparticles derived from simulated cloud-processed mineral dusts. / Calabrese, Sergio; Kadar, Enikö; Fisher, Andrew; Shi, Zongbo; Lead, Jamie; Valsami-Jones, Eugenia; Stolpe, Björn.
In: Science of the Total Environment, Vol. 466-467, 2014, pag. 864-870.Risultato della ricerca: Article
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TY - JOUR
T1 - Colloidal stability of nanoparticles derived from simulated cloud-processed mineral dusts
AU - Calabrese, Sergio
AU - Kadar, Enikö
AU - Fisher, Andrew
AU - Shi, Zongbo
AU - Lead, Jamie
AU - Valsami-Jones, Eugenia
AU - Stolpe, Björn
PY - 2014
Y1 - 2014
N2 - 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).
AB - 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).
UR - http://hdl.handle.net/10447/84844
M3 - Article
VL - 466-467
SP - 864
EP - 870
JO - Science of the Total Environment
JF - Science of the Total Environment
SN - 0048-9697
ER -