Optimization of Copper(II) Adsorption onto Novel Magnetic Calcium Alginate/Maghemite Hydrogel Beads Using Response Surface Methodology

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• 作者：Huayue Zhu ; Yongqian Fu ; Ru Jiang ; Jun Yao ; Ling Xiao ; Guangming Zeng
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：March 12, 2014
• 年：2014
• 卷：53
• 期：10
• 页码：4059-4066
• 全文大小：522K
• 年卷期：v.53,no.10(March 12, 2014)
• ISSN：1520-5045

文摘

Magnetic calcium alginate hydrogel beads (m-CAHBs, 3.4 mm average diameter) composed of maghemite nanoparticles and calcium alginate were prepared and characterized by scanning electron microscopy (SEM) coupled with energy dispersive X-ray analysis (EDX). The response surface methodology was used to model and optimize the adsorption removal of Cu(II) from aqueous solution by m-CAHBs. Adsorption experiments were also carried out to examine the effect of three parameters, such as pH (2.0鈥?.0), adsorbent dosage (2.0鈥?.0 g L^鈥?) and initial Cu(II) ion concentration (250鈥?50 mg L^鈥?). Maximum percent removal was attained under the optimum conditions with pH 2.0, 2.0 g L^鈥? adsorbent dosage for 250 mg L^鈥? initial Cu(II) ion concentration. The amount of Cu(II) adsorption after 6 h was recorded as high as 159.24 mg g^鈥? for 500 mg L^鈥? initial Cu(II) ion concentration. The adsorption kinetics indicated that the adsorption process was better described by the pseudo-second-order kinetic model. Desorption experiments indicated that the adsorption mechanism of Cu(II) occurred preferentially more by chelation than by electrostatic interaction. The percent removal of Cu(II) on m-CAHBs could still be maintained at 73% level at the fifth cycle.