Abstract A facile and simple chemical precipitation method was utilized to synthesize FeFe2O4 magnetic nanomaterial for removing methylene blue (MB) from aqueous solution. Characterizations of this material were examined by using XRD, SEM, FT-IR, TGA-DTG and BET methods. Factors affecting the uptake of methylene blue, including pH, adsorption time, and MB initial concentration were also studied. The measured data were fitted by using four isotherm models including Langmuir, Freundlich, Sips and Temkin. Results showed that the Sips model offers the best fit to the data. In addition, the monolayer MB adsorption capacity obtained from the Langmuir model was 42.35 mg g−1 under the optimal conditions of pH = 10 and adsorption time = 80 min. In particular, the uptake of MB onto FeFe2O4 magnetic nanomaterial obtained from the kinetic and mechanism studies of the adsorption was in good agreement with prediction of the pseudo-first-order model, whereas the electrostatic interaction was found to play a primary mechanism.

中文翻译：

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用于从水溶液中去除亚甲基蓝的 FeFe2O4 磁性纳米材料的简便合成

摘要 采用简便易行的化学沉淀法合成FeFe2O4磁性纳米材料，用于去除水溶液中的亚甲基蓝(MB)。通过使用 XRD、SEM、FT-IR、TGA-DTG 和 BET 方法检查了该材料的表征。还研究了影响亚甲蓝吸收的因素，包括 pH 值、吸附时间和 MB 初始浓度。测量数据采用四种等温线模型拟合，包括 Langmuir、Freundlich、Sips 和 Temkin。结果表明，Sips 模型提供了对数据的最佳拟合。此外，在 pH = 10 和吸附时间 = 80 min 的最佳条件下，从 Langmuir 模型获得的单层 MB 吸附容量为 42.35 mg g-1。特别是，