Magnetic-controlled aerogels from carboxylated cellulose and MnFe2O4 as a novel adsorbent for removal of Cu(II)
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The pore structure of the regenerated cellulose hydrogel was used as a microreactor for generating magnetic MnFe2O4 nanoparticles via in situ co-precipitation technology. Sodium periodate and sodium chlorite were used as oxidants, and the carboxyl modification of magnetic cellulose aerogels was achieved through a two-step oxidation reaction. The method used was convenient and environmental-friendly, and the raw materials were also green and non-toxic. The addition of magnetic nanoparticles promoted the adsorption and enabled the recycling of materials. The results showed that the adsorption equilibrium time was only 120 min and adsorption capacity could be increased by increasing the adsorption temperature. The maximum adsorption capacity of Cu(II) was 73.70 mg/g at 25 °C when the initial concentration of solution was150 mg/L. The adsorption behaviour towards Cu(II) followed the pseudo-secondary reaction kinetics and the Langmuir isotherm adsorption model. According to the results of XPS, carboxyl and hydroxyl groups were the main active adsorption sites for Cu(II). Moreover, all the composite aerogels exhibited good reusability and could be easily separated from the water after adsorption.
KeywordsCarboxylation Magnetic aerogel MnFe2O4–cellulose Copper cation Adsorption
This work was financially supported by the Major Program of Natural Science Fund in Colleges and Universities of Jiangsu Province (15KJA430005), Key Research and Development(Industry Prospect and Common Key Technology) Project of Jiangsu Province (BE2016171, BE2017151), the Program for Changjiang Scholars and Innovative Research Team in University (No.IRT_15R35), the Postgraduate Research&Practice Innovation Program of Jiangsu Province and the Priority Academic Program Development of Jiangsu Higher Education Institutions. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of these programmes.
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