• fabrication of β-cyclodextrin conjugated magnetic hnt/iron oxide composite for high-efficient decontamination of u(vi)

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 449
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     in this study, β-cyclodextrin (β-cd) was chemically grafted onto halloysite nanotube/iron oxides (hnt/iron oxides) to prepare a novel magnetic cd/hnt/iron oxide composite. the xrd pattern and ft-ir spectra analysis provide evidence for the successful grafting of β-cd on hnt/iron oxide surfaces. elemental analysis indicates that the grafted β-cd amount in cd/hnt/iron oxide composite is 112 mg/g. batch technique was adopted to investigate the removal efficiency of u(vi) from aqueous solutions by cd/hnt/iron oxide as a function of various environmental factors. the sorption reversibility and performance of cd/hnt/iron oxide in simulated effluent disposal were also tested. the sorption kinetic data can be well fitted by the pseudo-second-order model. the ph-dependent sorption suggests an optimal ph value of 7.0 for using cd/hnt/iron oxide in the decontamination of u(vi) from aqueous solutions. the sorption irreversibility at ph 5.5 was attributed to the inner-sphere binding of u(vi) on cd/hnt/iron oxide surface sites. the maximum sorption capacity of u(vi) on cd/hnt/iron oxide is considerably higher than that of some other reported materials. related data show that cd/hnt/iron oxide exhibits satisfactory treatment efficiency for the simulated wastewater. it is worth noting that cd/hnt/iron oxide could be easily separated from aqueous solution by using a permanent magnet. by integrating the experimental results presented in this study, it is clear that cd/hnt/iron oxide can be potentially used as a cost-effective material for the purification of actual u(vi)-bearing effluents.

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