Continuous preparation of Fe3O4 nanoparticles combined with surface modification by L-cysteine and their application in heavy metal adsorption

L-cysteine functionalized Fe3O4 magnetic nanoparticles (Cys–Fe3O4 MNPs) were continuously fabricated by a simple high-gravity reactive precipitation method combined with surface modification through a novel impinging stream-rotating packed bed with the assistance of sonication. The obtained Cys–Fe3O...

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Bibliographic Details
Published inCeramics international Vol. 42; no. 3; pp. 4228 - 4237
Main Authors Fan, Hong-Lei, Li, Lei, Zhou, Shao-Feng, Liu, You-Zhi
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.02.2016
Subjects
Adsorption
Fe3O4 nanoparticles
Heavy metal
Impinging stream-rotating packed bed
L-cysteine
L-cysteine
Adsorption
Impinging stream-rotating packed bed
Fe3O4 nanoparticles
Heavy metal
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Summary:L-cysteine functionalized Fe3O4 magnetic nanoparticles (Cys–Fe3O4 MNPs) were continuously fabricated by a simple high-gravity reactive precipitation method combined with surface modification through a novel impinging stream-rotating packed bed with the assistance of sonication. The obtained Cys–Fe3O4 MNPs was characterized by XRD, TEM, FTIR, TGA and VSM, and further used for the removal of heavy metal ions from aqueous solution. The influence of pH values, contact time and initial metal concentration on the adsorption efficiency were investigated. The results revealed that the adsorption of Pb(II) and Cd(II) were pH dependent process, and the pH 6.0 was found to be optimum condition. Moreover, the adsorption kinetic for Cys–Fe3O4 MNPs followed the mechanism of the pseudo-second order kinetic model, and their equilibrium data were fitted with the Langmuir isothermal model well. The maximum adsorption capacities calculated from Langmuir equation were 183.5 and 64.35mgg−1 for Pb(II) and Cd(II) at pH 6.0, respectively. Furthermore, the adsorption and regeneration experiment showed there was about 10% loss in the adsorption capacity of the as-prepared Cys–Fe3O4 MNPs for heavy metal ions after 5 times reuse. All the above results provided a potential method for continuously preparing recyclable adsorbent applied in removing toxic metal ions from wastewater through the technology of process intensification.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2015.11.098