High-capacity adsorption of dissolved hexavalent chromium using amine-functionalized magnetic corn stalk composites.
High-capacity adsorption of dissolved hexavalent chromium using amine-functionalized magnetic corn stalk composites.
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DOI：
10.1016/j.biortech.2015.01.103
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发表时间：
2015-08
影响因子：
11.4
通讯作者：
Wen Song;B. Gao;Tengge Zhang;Xing Xu;Xinghai Huang;Huan Yu;Q. Yue
中科院分区：
文献类型：
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作者：
Wen Song;B. Gao;Tengge Zhang;Xing Xu;Xinghai Huang;Huan Yu;Q. Yue
采用易分离的胺功能化磁性玉米秸秆复合材料（AF-MCS）对有毒的六价铬[Cr（VI）]进行有效吸附和还原，得到无毒的Cr（III）。AF-MCS的饱和磁化强度达到6.2emu/g，具有超顺磁性，可通过磁化过程从水溶液中分离。对影响吸附行为的各种因素的研究表明，AF-MCS对Cr（VI）的最佳吸附量为1g/L，在pH 3.0时吸附量最大。吸附过程符合Langmuir吸附等温式和准二级动力学模型。通过XRD、SEM、TEM、FT-IR、BET、VSM和XPS等分析手段对AF-MCS进行表征，探讨其吸附机理。基本上，这些结果表明，在这项工作中制备的AF-MCS已显示出其优点，在有效地去除Cr（VI）和快速分离的同时从废水中。
Easily separable amine-functionalized magnetic corn stalk composites (AF-MCS) were employed for effective adsorption and reduction of toxic hexavalent chromium [Cr(VI)] to nontoxic Cr(III). The saturated magnetization of AF-MCS reached 6.2 emu/g, and as a result, it could be separated from aqueous solution by a magnetic process for its superparamagnetism. The studies of various factors influencing the sorption behavior indicated that the optimum AF-MCS dosage for Cr(VI) adsorption was 1 g/L, and the maximum adsorption capacity was observed at pH 3.0. The chromium adsorption perfectly fitted the Langmuir isotherm model and pseudo second order kinetic model. Furthermore, characterization of AF-MCS was investigated by means of XRD, SEM, TEM, FT-IR, BET, VSM and XPS analysis to discuss the uptake mechanism. Basically, these results demonstrated that AF-MCS prepared in this work has shown its merit in effective removal of Cr(VI) and rapid separation from effluents simultaneously.