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مجله مهندسی شیمی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • synthesis and application of magnetic graphene/iron oxides composite for the removal of u(vi) from aqueous solutions

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 739
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    • شماره تماس دبیرخانه رویداد: -
     graphene has been extensively concerned in multidisciplinary research fields due to its remarkably physicochemical characteristics. herein, magnetic graphene/iron oxides composite (fe3o4/go) which was synthesized from graphene using a chemical reaction approach had been employed as a novel adsorbent for the preconcentration and solidification of u(vi) ions from aqueous solutions. the sorption behavior of u(vi) on the surface of fe3o4/go was carried out under ambient conditions such as contact time, ph and ionic strength according to concentration of cu(vi)initial = 1.12 × 10−4 mol/l. the langmuir and freundlich models were adopted to simulate sorption isotherms of u(vi) at three different temperatures relying on the concentration of cu(vi)initial = 2.25 × 10−5 to 2.24 × 10−4 mol/l, the experimental results suggested that the sorption reaction was favored at higher temperature. the ph-dependent and ionic strength-independent u(vi) sorption on fe3o4/go demonstrated that the sorption mechanism of u(vi) was inner-sphere surface complexation at low ph values, whereas the removal of u(vi) was achieved by simultaneous precipitation and inner-sphere surface complexation at high ph values. the maximum sorption capacity of u(vi) on fe3o4/go at t = 293 k and ph = 5.5 ± 0.1 was about 69.49 mg/g higher than majority of materials and nanomaterials reported. magnetic separation has been considered as an effective and quick technique for separating magnetic particles, without filtration and centrifugation. the fe3o4/go can be favorably separated from aqueous solution under an applied magnetic field from large volumes of aqueous solutions. the experimental results show that the fe3o4/go is a promising adsorbent for the removal of radionuclides and heavy metal ions from large volumes of aqueous solution.

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