Arsenate removal with 3-mercaptopropanoic acid-coated superparamagnetic iron oxide nanoparticles
2015 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 438, 227-234 p.Article in journal (Refereed) Published
In the present work, superparamagnetic iron oxide nanoparticles (SPION) surface-coated with 3-merca-ptopropanoic acid (3-MPA) were prepared and their feasibility for the removal of arsenate from dilute aqueous solutions was demonstrated. The synthesized 3-MPA-coated SPION was characterized using transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier transform infra-red spectrometry (FTIR). Separation efficiency of the coated nanoparticles and the equilibrium isotherm of arsenate adsorption were investigated. The obtained results reveal the arsenate adsorption to be highly pH-dependent, and the maximum adsorption was attained in less than 60 min. The resulting increase of 3-MPA-coated SPION adsorption capacity to twice the adsorption capacity of SPION alone under the same conditions is attributed to the increase of active adsorption sites. An adsorption reaction is proposed. On the other hand, efficient recovery of arsenate from the loaded nanoparticles was achieved using nitric acid (HNO3) solution, which also provides a concentration over the original arsenate solution.
Place, publisher, year, edition, pages
2015. Vol. 438, 227-234 p.
:Arsenate removal, Superparamagnetic iron oxide nanoparticles, SPION, 3-Mercaptopropionic acid
IdentifiersURN: urn:nbn:se:kth:diva-159107DOI: 10.1016/j.jcis.2014.10.005ISI: 000346692100029ScopusID: 2-s2.0-84908432404OAI: oai:DiVA.org:kth-159107DiVA: diva2:784312
QC 201501292015-01-292015-01-222015-01-29Bibliographically approved