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a novel and inexpensive approach was adopted to develop magnetic porous γ-fe₂o₃/c@hkust-1 composites for the adsorption of dyes and heavy metal ions from aqueous solution. the γ-fe₂o₃/c with unique functional groups present such as –oh and –nh₂ was used as the support to directly grow hkust-1 by a stepwise liquid-phase epitaxy process. the crystallographic, morphology, and magnetic properties as well as porosity of the as-synthesized γ-fe₂o₃/c @hkust-1 composites were carefully studied by xrd, sem, tem, xps, tga, and bet. the results indicated that the bet surface area, micropore volume, and saturation magnetization of the γ-fe₂o₃/c @hkust-1 are 993.4 m² g⁻¹, 0.69 cm³ g⁻¹, and 12.6 emu g⁻¹, respectively. in addition, a uniform distribution of ultrafine γ-fe₂o₃ nanoparticles with an average diameter of 2–3 nm was observed in the γ-fe₂o₃/c@hkust-1 composites. our results showed that methylene blue (mb) and cr(vi) (used as a model for typical dye pollutants and heavy metal ions) are effectively removed from aqueous solutions by γ-fe₂o₃/c@hkust-1. the maximum adsorption capacities were 370.2 and 101.4 mg g⁻¹ of adsorbent for mb and cr(vi), respectively. moreover, a removal efficiency of about 90% was retained after five cycles of consecutive adsorption–desorption. the adsorption kinetics data were well described by a pseudo-second-order model (r² > 0.99), and equilibrium data were well fitted to the langmuir isotherm model (r² > 0.99). finally, our results suggested that the γ-fe₂o₃/c@hkust-1 composites have a great potential to be employed for treatment of wastewater containing mb and cr(vi).

该文章中材料表征采用的是美国麦克仪器3flex

详情可参考下面链接：

http://pubs.rsc.org/en/content/articlelanding/2014/ra/c4ra12468e#!divabstract