Synthesis of Fe3O4/Humic Acid/Silver nanoparticles and their application in Cu and Cd adsorption

Abstract

Nanoparticle technology developed rapidly due to the multifunctional utilization of nanoparticles in many disciplines such as medicine, drug delivery, environmental chemistry, food chemistry and analytical chemistry. In concept of this study, magnetic nanoparticles with a core-shell structure were synthesized and applied to the adsorption of copper and cadmium. The synthesis procedure consists of two steps. In the first step a core-shell structure was formed with Fe₃O₄ and humic acid. In the second step, the coating of synthesized core/shell structure with silver occurs. The characterization of synthesized nanoparticles was performed with the aid of Scanning Electron Microscope (SEM) images combined with an elemental distribution image (EDX mapping), Zeta Potential, and Dynamic Light Scattering (DLS) analyses. Adsorption isotherms of copper and cadmium on Fe₃O₄/HA/Ag multi-component structure were studied. The optimum adsorption conditions in aqueous solutions were fixed at pH 9 and at 300 K. As a result, the Fe₃O₄/HA/Ag multi-component structure showed excellent adsorption capacity for both copper and cadmium ions with removal percentages of 92% and 97% after the calculations were performed using the absorbance values measured by Flame Atomic Absorption Spectrometer (FAAS) respectively. Langmuir isotherm, which describes the monolayer adsorption was found to be the most adequate to fit the overall procedure. 

Keywords

• Nanocomposites,magnetic nanoparticles,humic acid,metal removal,Langmuir isotherm

References

1. [1] Faraji M, Yamini Y, Razaee M (2010) Magnetic nanoparticles: Synthesis, Stabilization, Functionalization, Characterization and its applications. J. Iran. Chem. Soc. 7(1):1. doi: 10.1007/BF03245856
2. [2] W. Z. Zhang, “Nanoscale iron particles for environmental remediation: An overview,” J. Nanopart Res., vol. 5, pp323-332, 2003.
3. [3] Y. C. Chang, D. H. Chen, “Preparation and adsorption properties of monodisperse chitosan-bound Fe3O4 magnetic nanoparticles for removal of Cu(II) ions,” J. Colloid Interface Sci., vol 283, pp446-451, 2005.
4. [4] N. Savage, M. S. Diallo , “Nanomaterials and water purification: oppurtunities and challenges,” J. Nanopart. Res., vol 7, pp331-342, 2005.
5. [5] E. Erdem , N. Karapınar, R. Donat, “The removal of heavy metal cations by natural zeolites,” J. Colloid and Interface Sci. , vol 280, pp 309-314, 2004.
6. [6] Y. G. Ko, U. S. Choi, “Diverse applications of fibers surface-functionalized with nano- and microparticles,” Composites Science and Technology, vol 79, pp 77-86, 2013.
7. [7] K. Aguilar-Artega, J. A. Rodriguez, E. Barroda, “Magnetic solids in analytical chemistry: A review.”, Analytica Chimica Acta., vol. 674, pp 157-165, 2010.
8. [8] B. H. Jun, M. S. Noh, G. Kim, H. Kang, J. H. Kim, W. J. Chung, M. S. Kim, Y. K. Kim, M. H. Cho, D. H. Jeong, Y. S. Lee, “Protein separation and identification using magnetic beads encoded with surface enhanced Raman spectroscopy,”Anal. Biochem., vol. 391, pp. 24-30, 2009.

9. [9] S. Yean, L. Cong, J. T. Yavuz, M. Yu, “Effect of Material Particle Size on Adsorption and Desorption of Arsenite and Arsenate”, J. Mat. Res., vol. 20, pp. 3255-3264, 2005.
10. [10] M. Rong, M. Q. Zhang, H. Liu, H. Zeng, “Synthesis of silver nanoparticles and their self-organization behavior in epoxy resin,” Polymer , vol. 40, pp. 6169-6177, 1999.
11. [11] M. Z. Rong, M. Q. Zhang, H. B. Wang, H. M. Zeng, “Surface modification of magnetic metal nanoparticles through irradiation graft polymerization,” Applied surface science, vol. 200, pp. 76-93, 2002.
12. [12] S. T. Dubas, V. Pimpan, “Humic acid assisted synthesis of silver nanoparticles and its application on herbicide detection,” Materials Letters , vol. 62, pp. 2661-2663, 2008.
13. [13] E. Pena-Mendez, J. Havel, J. Patocka (2004), “Humic substances- compounds of still unknown structure: applications in agriculture, industry, environment and biomedicine,” J. Appl. Biomed., vol. 3, pp. 13-24, 2004.
14. [14] E. A. Ghabbour, G. Davies, N. K. Ghali, M. D. Mulligan, “The effect of temperature on tight metal binding by peat and soil derived solid humic acids,” Canad. J. Soil. Sci., vol. 81, pp. 331-336, 2001.
15. [15] J. B. Green, S. E. Manahan, “Absorption of sulphur dioxide by sodium humates,” Fuel , vol. 60, pp. 488-494, 1981.
16. [16] A. Oehmen, Z. Yuan, L. L. Blackall, J. Keller, “Short-term effects of carbon source on the competition of polyphosphate accumulating organisms and glycogen accumulating organisms,” Water Sci. Technol. , vol 50, pp.139-146.
17. [17] E. lls, E. Tombacz, “The role of variable surface charge and surface complexation in the adsorption of humic acid on magnetite,” Colloids Surf. , v. 230, pp. 99-109, 2003.
18. [18] J. F. Liu, Z. S. Zhao, G. B. Jiang, “Coating Fe3O4 magnetic nanoparticles with Humic acid for high efficient removal of heavy metals in water,” Environ. Sci. Technol., vol. 42, pp. 6949-6954, 2008.
19. [19] B. Lv, Y. Xu, H. Tian, D. Wu, Y. Sun, “Synthesis of Fe3O4/ SiO2/Ag nanoparticles and its application on surface enhanced Raman scattering,” Journal of solid state chemistry , v.18, pp. 2968-2973.
20. [20] N. Unlu, M. Ersoz, “Adsorption characteristics of heavy metal ions onto a low cost biopolymeric sorbent from aqueous solutions,” J. Hazard Mater., vol. 136, pp. 272-280, 2006.