Journal article
Particle size, charge and colloidal stability of humic acids coprecipitated with ferrihydrite
R Angelico, A Ceglie, JZ He, YR Liu, G Palumbo, C Colombo
Chemosphere | Published : 2014
Abstract
Humic acids (HA) have a colloidal character whose size and negative charge are strictly dependent on surface functional groups. They are able to complex large amount of poorly ordered iron (hydr)oxides in soil as a function of pH and other environmental conditions. Accordingly, with the present study we intend to assess the colloidal properties of Fe(II) coprecipitated with humic acids (HA) and their effect on Fe hydroxide crystallinity under abiotic oxidation and order of addition of both Fe(II) and HA. TEM, XRD and DRS experiments showed that Fe-HA consisted of Ferrihydrite with important structural variations. DLS data of Fe-HA at acidic pH showed a bimodal size distribution, while at ver..
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Awarded by National Natural Science Foundation of China
Funding Acknowledgements
C. Colombo thanks the financial support from the CAS as Visiting Professor Programs to the Research Centre for Eco-environmental Sciences of Beijing. R.A. and A.C. acknowledge Consorzio per lo Sviluppo dei Sistemi a Grande Interfase (CSGI) and the Natural Science Foundation of China (51221892 and 41090281) for financial support.