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Reference type: Journal
Authors: Fan LL, Luo CN, Lv Z, Lu FG, Qiu HM
Article Title: Removal of Ag+ from water environment using a novel magnetic thiourea-chitosan imprinted Ag+.
Publication date: 2011
Journal: Journal of Hazardous Materials
Volume: 194
Issue: (1)
Page numbers: 193-201.
DOI: 10.1016/j.jhazmat.2011.07.080
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0304389411009617

Abstract: A novel, thiourea-chitosan coating on the surface of magnetite (Fe3O4) (Ag-TCM) was successfully synthesized using Ag(I) as imprinted ions for adsorption and removal of Ag(I) ions from aqueous solutions. The thermal stability, chemical structure and magnetic property of the Ag-TCM were characterized by the scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR) and vibrating sample magnetometer (VSM), respectively. Batch adsorption experiments were performed to evaluate the adsorption conditions, selectivity and reusability. The results showed that the maximum adsorption capacity was 4.93 mmol/g, observed at pH 5 and temperature 30 C. Equilibrium adsorption was achieved within 50 min. The kinetic data, obtained at the optimum pH 5, could be fitted with a pseudo-second order equation. Adsorption process could be well described by Langmuir adsorption isotherms and the maximum adsorption capacity calculated from Langmuir equation was 5.29 mmol/g. The selectivity coefficient of Ag(I) ions and other metal cations onto Ag-TCM indicated an overall preference for Ag(I) ions, which was much higher than non-imprinted thiourea-chitosan beads. Moreover, the sorbent was stable and easily recovered, the adsorption capacity was about 90% of the initial saturation adsorption capacity after being used five times
Template and target information: silver ions, Ag(I)
Author keywords: Thiourea-chitosan, Magnetite, Langmuir, adsorption, Ag+


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