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Removal of Cd, Pb and Cu from Water Using Thiol and Humic Acid Functionalized Fe2O3 Nanoparticles

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Abstract:

Humic acid (HA) and 3-Mercaptopropyltriethoxysilane (MPTES) were successfully coated onto the surface of Fe2O3 (α and γ) nano-particles as characterized using IR and BET-N2 analysis, the potential use of the naked and functionalized nano-Fe2O3 particles as novel nano-sorbents for removal of Cd, Pb and Cu ions in solution was investigated in this study. The result indicated that the sorption of Cd, Pb and Cu ions by the nano-particles can be fitted well using langmuir isotherm; all the adsorbents exhibited definitely adsorption ability to Cd, Pb and Cu ions in solution. The sorption maximum and sorption affinity on the nano-particles for Pb (aq) were always higher than Cu (aq) and Cd (aq), the sorption maxima for the Pb, Cd and Cu followed the order Pb>Cu>Cd. Among the nano-sorbents, the Fe2O3 (α and γ) nano-particles coated with HA exhibited higher sorption ability to metal ions than the naked and thiolated Fe2O3 nano-particles, the sorption maxima of α-Fe2O3/HA for Pb(aq) reached 151.5 mg/g, which was significantly higher than the values of 116.3 and 84.0 mg/g observed for the α-Fe2O3 and α- Fe2O3/MPTES particles. However, no increased sorption maxima was observed for the thiolated Fe2O3 nano-particles (Fe2O3/MPTES) for the metal ions compared with the naked Fe2O3 nano-particles in this study. The greater capability of Fe2O3/HA to adsorb Cd(aq), Pb(aq), Cu(aq) indicates its potential use as another promising way to remediate metals-contaminated water.

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Periodical:

Advanced Materials Research (Volumes 518-523)

Pages:

1956-1963

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.518-523.1956

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Online since:

May 2012

Authors:

Meng Wang, Shi Bao Chen

Keywords:

Adsorption, Cd, Cu, Fe2O3 Nano-Particles, Functionalization, Pb

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