Due to the complexity of the contaminations in wastewater, a universal adsorbent that takes many sorts of pollutant is desired. A multi-functioning magnetic Fe3O4-cored magnesium-aluminum layered double oxide (Fe3O4@LDO) composite was prepared and employed as an adsorbent for removing F−, Sb(III) and MO from water, respectively, which are three typical contaminants with different molecule sizes as water contamination. The effect of pH contact time and initial concentrations of pollutants on the removal rates of each contaminant were investigated. Fe3O4@LDO composite showed excellent adsorption performance for all of the three molecules F−, Sb(III) and MO, and their maximum adsorption capacities are as high as 258, 391, and 506mg/g, respectively. The adsorption process of F−, Sb(III) and MO on Fe3O4@LDO fitted well to Langmuir model and pseudo-second-order kinetic model. The adsorption mechanisms of F−, Sb(III) and MO on Fe3O4@LDO were investigated. We discovered that iron ions diffused from Fe3O4 nanospheres contributed to the good performance of the absorbent.

中文翻译：

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铁扩散掺杂的镁铝层状双氧化物作为多功能吸附剂，用于去除水中的 F-、Sb(III) 和甲基橙污染物

由于废水中污染物的复杂性，需要一种能吸附多种污染物的通用吸附剂。制备了一种多功能磁性 Fe3O4 核镁铝层状双氧化物 (Fe3O4@LDO) 复合材料，并将其用作吸附剂，分别去除水中的三种典型污染物 F−、Sb(III) 和 MO。分子大小作为水污染。研究了 pH 接触时间和污染物初始浓度对每种污染物去除率的影响。Fe3O4@LDO 复合材料对 F−、Sb(III) 和 MO 三种分子均表现出优异的吸附性能，其最大吸附容量分别高达 258、391 和 506mg/g。F−的吸附过程，Fe3O4@LDO上的Sb(III)和MO与Langmuir模型和准二级动力学模型拟合良好。研究了 F−、Sb(III) 和 MO 在 Fe3O4@LDO 上的吸附机制。我们发现从 Fe3O4 纳米球扩散的铁离子有助于吸收剂的良好性能。