Facile synthesis of EDTA grafted 3D spherical-chain porous silica with high capacity for rapidly selective adsorption of
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Facile synthesis of EDTA grafted 3D spherical-chain porous silica with high capacity for rapidly selective adsorption of Cu(II) from aqueous solutions Zixuan Ma1 · Fang Li1 · Aizhong Jia1 · Xiao Zhang1 · Yanji Wang1 Accepted: 30 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The highly efficient adsorbents with fast adsorption rate, high adsorption capacity and selectivity as well as good reusability were successfully synthesized through fabricating 3D spherical-chain porous silica material and grafting modification with ethylenediaminetetraacetic acid (EDTA) for the selective removal Cu(II) from wastewater. The obtained adsorbents were characterized by XRD, FT-IR, SEM, TEM, XPS, N2 adsorption–desorption and back titration. The results indicate that the 3D framework structure is adjustable in a certain range by varying the parameters of the synthesis system. And the adsorption performance of the materials was investigated under different conditions such as pH, contact time and initial metal ions concentration. Under the experiment conditions, the synthesized adsorbent is efficient in removing Cu(II) and the adsorption equilibrium could be achieved within only 5 min, and the kinetic data are well fitted by pseudo-second-order and Langmuir isotherm models. The prepared adsorbents display good selective adsorption of Cu(II) and can be feasibly regenerated without evident decrease even after five recycles. Basing on the obtained results, the plausible adsorption mechanism was proposed and analyzed. Keywords Porous silica · 3D spherical-chain · EDTA functionalization · Cu(II) · Selective adsorption
1 Introduction Currently, due to the industrial effluent discharges, a large variety of toxic heavy metals was discharged into the environment, which poses severe harm to the natural ecosystems. Unlike other pollutants, heavy metals are non-biodegradable and can gradually accumulate in the environment, so that excess heavy metals may lead to human health complications [1]. Therefore, removing heavy metal ions from industrial effluents is an urgent problem for human health and natural ecosystems [2]. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10934-020-00991-0) contains supplementary material, which is available to authorized users. * Aizhong Jia [email protected] 1
Hebei Provincial Key Laboratory of Green Chemical Technology & High Efficient Energy Saving, Tianjin Key Laboratory of Chemical Process Safety, Hebei University of Technology, Tianjin 300130, People’s Republic of China
As one of the most common heavy metal ions, Cu(II) is considered to severely contaminate ecological water [3, 4]. Thus, many strategies have been adopted for removing Cu(II) from the contaminated water such as coagulation–flocculation, chemical precipitation, electrochemical treatment, reverse osmosis, ion exchange, bioremediation and adsorption [5–8]. The adsorption is regarded as the most effective and economical approach due to its lo
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