采用胺功能化磁性玉米秸秆复合材料吸附溶解态六价铬。
High-capacity adsorption of dissolved hexavalent chromium using amine-functionalized magnetic corn stalk composites.
机构信息
Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
Key Laboratory of Water Pollution Control and Recycling (Shandong), School of Environmental Science and Engineering, Shandong University, Jinan 250100, PR China.
出版信息
Bioresour Technol. 2015 Aug;190:550-7. doi: 10.1016/j.biortech.2015.01.103. Epub 2015 Feb 7.
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 6.2emu/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 1g/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.
易于分离的胺功能化磁性玉米秸秆复合材料（AF-MCS）被用于有效吸附和还原有毒的六价铬[Cr（VI）]为无毒的Cr（III）。AF-MCS 的饱和磁化强度达到 6.2emu/g，因此由于其超顺磁性，它可以通过磁过程从水溶液中分离出来。研究各种影响吸附行为的因素表明，AF-MCS 吸附六价铬的最佳用量为 1g/L，在 pH 值为 3.0 时观察到最大吸附容量。铬的吸附非常符合朗缪尔等温吸附模型和准二级动力学模型。此外，通过 XRD、SEM、TEM、FT-IR、BET、VSM 和 XPS 分析对 AF-MCS 的特性进行了表征，以讨论其吸附机理。基本上，这些结果表明，本工作中制备的 AF-MCS 在有效去除 Cr（VI）和快速从废水中分离方面表现出了优势。
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