摘要
Fe-Al(hydr)oxide nano-/micro-particles were well grown and dispersed on a wheat straw template, which was characterized by a scanning electron microscope(SEM) with energy-dispersive X-ray spectroscopy(EDS), X-ray diffraction(XRD), and a vibrating sample magnetometer(VSM). The adsorption mechanism of the biomass-based Fe-Al(hydr)oxide nanocomposite was studied by the adsorption isotherms, which followed the Langmuir model better than the Freundlich and Temkin models. In particular, a synergistic adsorption by the mixed Fe-Al(hydr)oxide nano-/micro-particles based on the wheat straw was found, with higher maximum adsorption capacity(Q_0) than that of the material containing only Fe_3O_4 or Al(OH)_3 nano-/micro-particles, which was most obvious when the mole ratio of Fe to Al was 1:1. The degree of this unusual effect was reasonably determined by the departure between the experimental and calculated maximum adsorption capacity(Q_0-Q_0(cal)), which showed that the synergistic effect was most pronounced when the mole ratio of Fe to Al was approximately 1:1. The good adsorption capacity of the mixed Fe-Al(hydr)oxide nano-/micro-particles and the good dispersity by the wheat straw matrix were combined in the biomass-based Fe-Al(hydr)oxide nanocomposite. The nanocomposite material showed high adsorption capacity for both fluoride(F-) and arsenic(As(III) and As(V)), and had the advantage of magnetic separation by tuning its compositions.
Fe-Al(hydr)oxide nano-/micro-particles were well grown and dispersed on a wheat straw template, which was characterized by a scanning electron microscope(SEM) with energy-dispersive X-ray spectroscopy(EDS), X-ray diffraction(XRD), and a vibrating sample magnetometer(VSM). The adsorption mechanism of the biomass-based Fe-Al(hydr)oxide nanocomposite was studied by the adsorption isotherms, which followed the Langmuir model better than the Freundlich and Temkin models. In particular, a synergistic adsorption by the mixed Fe-Al(hydr)oxide nano-/micro-particles based on the wheat straw was found, with higher maximum adsorption capacity(Q_0) than that of the material containing only Fe_3O_4 or Al(OH)_3 nano-/micro-particles, which was most obvious when the mole ratio of Fe to Al was 1:1. The degree of this unusual effect was reasonably determined by the departure between the experimental and calculated maximum adsorption capacity(Q_0-Q_0(cal)), which showed that the synergistic effect was most pronounced when the mole ratio of Fe to Al was approximately 1:1. The good adsorption capacity of the mixed Fe-Al(hydr)oxide nano-/micro-particles and the good dispersity by the wheat straw matrix were combined in the biomass-based Fe-Al(hydr)oxide nanocomposite. The nanocomposite material showed high adsorption capacity for both fluoride(F-) and arsenic(As(III) and As(V)), and had the advantage of magnetic separation by tuning its compositions.
引文
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