Removal of heavy metal ions from aqueous solution using Fe3O4-SiO2-poly(1,2-diaminobenzene) core-shell sub-micron particles |
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Authors: | Fan ZhangJing Lan Zongshan ZhaoYe Yang Ruiqin TanWeijie Song |
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Institution: | a Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China b College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, PR China c Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, PR China d Faculty of Information Science and Engineering, Ningbo University, Ningbo 315211, PR China |
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Abstract: | In this work, Fe3O4-SiO2-poly(1,2-diaminobenzene) sub-micron particles (FSPs) with high saturated magnetization of ∼60-70 emu/g were developed and utilized for the removal of As(III), Cu(II), and Cr(III) ions from aqueous solution. The isothermal results fitted well with the Freundlich model and the kinetic results fitted well with the two-site pseudo-second-order model, which indicated that multilayer adsorption of As(III), Cu(II), and Cr(III) ions on FSPs occurred at two sites with different energy of adsorption. The maximum adsorption capacities followed the order of As(III) (84 ± 5 mg/g, pH = 6.0) > Cr(III) (77 ± 3 mg/g, pH = 5.3) > Cu(II) (65 ± 3 mg/g, pH = 6.0). And the chelating interaction was considered as the main adsorption mechanism. The as-prepared materials were chemically stable with low leaching of Fe (?1.7 wt.%) and poly(1,2-diaminobenzene) (?4.9 wt.%) in tap water, sea water, and acidic/basic solutions. These metal-loaded FSPs could be easily recovered from aqueous solutions using a permanent magnet within 20 s. They could also be easily regenerated with acid. The present work indicates that the FSPs are promising for removal of heavy metal ions in field application. |
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Keywords: | Core-shell Adsorption isotherm Kinetics Stability Recovery |
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