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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Lead Adsorption on Magnetite at 200 deg C
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Lead Adsorption on Magnetite at 200 deg C

机译：Lead Adsorption on Magnetite at 200 deg C

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Lead uptake on magnetite (Fe_3O_4) has been quantitatively evaluated by equilibrium adsorption isotherms at 200 deg C and pH of 8.5 for 2 h contact time with Pb~(2+) ranging from 5 ppm to 175 ppm. The adsorption data has been fitted to Langmuir and Freundlich models. The maximum adsorption capacity of magnetite as a lead adsorbent was 90.9 mg/g and 4.59 mg/g for the Langmuir and Freundlich models, respectively. A pH-independent Pb~(2+) sorption on magnetite in the pH range of 3.3 to 10.3 was observed, possibly suggesting Pb~(2+) sorption is due to permanent charges through weak electrostatic, nonspecific attraction where cations are sorbed on the cation exchange sites rather than pH-dependent sorption through surface hydroxyl/surface complexation. Inductively coupled plasma-optical emission spectroscopy (ICP-OES), Fourier transform infrared spectrophotometry (FTIR), and x-ray diffraction (XRD) techniques were used to study the mechanism of Pb~(2+) adsorption on magnetite. XRD results indicated a monotonic increase in the lattice parameter of Pb~(2+) containing magnetite as a function of Pb~(2+) in solution from 5 ppm to 175 ppm.

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