Abstract Due to the amount of yeast residues generated by the industries and their high capacity as biosorbent, this work proposes the use of yeast biomass in natura (YB) or modified with ferromagnetic nanoparticles (Fe3O4) (YB-MNP) for Cu(II) removal from water. Synthesized YB-MNP, YB, and magnetite alone (MNP) were characterized by FTIR, XRD, and SEM. It was observed the efficient impregnation of magnetite on the surface of the biomass. Copper sorption was evaluated in batch tests using 100 mg/L of Cu(II) solution at pH 5.5, and the supernatant was analyzed by FAAS for Cu determination. Langmuir, Freundlich, and Dubinin–Radushkevich (D–R) isotherm models were applied to fit the experimental data. A favorable sorption process was observed for all the materials, mainly for the D–R model adjusted to the bionanocomposite data (YB-MNP), with r2 = 0.9950 and a low error (χ2 = 0.0427) associated to the model. Theoretical and experimentally Cu(II) sorption capacities were fairly similar, 8.6 ± 0.1 and 8.3 ± 0.2 mg/g, respectively.

中文翻译：

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用于去除水中Cu(II)的酵母基磁性生物纳米复合材料的合成、表征和应用

摘要 由于工业产生的酵母残留量及其作为生物吸附剂的高容量，这项工作提出在自然中使用酵母生物质 (YB) 或用铁磁纳米粒子 (Fe3O4) (YB-MNP) 改性 Cu(II)从水中去除。合成的 YB-MNP、YB 和单独的磁铁矿 (MNP) 通过 FTIR、XRD 和 SEM 进行表征。观察到磁铁矿在生物质表面上的有效浸渍。使用 pH 5.5 的 100 mg/L Cu(II) 溶液在批量测试中评估铜吸附，并通过 FAAS 分析上清液中的 Cu 含量。Langmuir、Freundlich 和 Dubinin-Radushkevich (D-R) 等温线模型用于拟合实验数据。对于所有材料都观察到有利的吸附过程，主要是针对根据生物纳米复合数据（YB-MNP）调整的 D-R 模型，r2 = 0。9950 和与模型相关的低误差 (χ2 = 0.0427)。理论和实验中的 Cu(II) 吸附容量非常相似，分别为 8.6 ± 0.1 和 8.3 ± 0.2 mg/g。