Adsorption properties of Fe3O4/Kaolin magnetic composites for Cu2+
-
摘要: 为实现高岭土(Kaolin)在Cu2+废水处理中的实际应用,采用球磨方法制备了剥离Kaolin,并通过氧化沉淀法制备了Fe3O4/Kaolin磁性复合材料。通过激光粒度分析仪、SEM、XRD对Fe3O4/Kaolin磁性复合材料的形貌及组成进行表征,并通过测试Fe3O4/Kaolin磁性复合材料对Cu2+的饱和吸附量和磁分离回收率,确定了当Kaolin球磨4.0 h、掺量为3.0 g时所制备的Fe3O4/Kaolin磁性复合材料对Cu2+的吸附性能最佳,平衡吸附量为17.98 mg/g。磁滞回线结果表明,Fe3O4/Kaolin磁性复合材料具有较好的磁响应性,饱和磁化强度约为16.19 emu/g。此外,采用Langmuir和Freundlich吸附等温式对Fe3O4/Kaolin磁性复合材料的吸附数据进行拟合,结果表明,Fe3O4/Kaolin磁性复合材料对Cu2+的吸附行为基本符合Langmuir吸附等温模型和Freundlich吸附等温模型,既存在单分子层吸附,也存在多分子层吸附。
-
关键词:
- 高岭土(Kaolin) /
- 氧化沉淀法 /
- Fe3O4 /
- Cu2+ /
- 吸附
Abstract: To facilitate Kaolin which was used to remove Cu2+ from waste water, the stripped Kaolin was prepared by ball milling and the Fe3O4/Kaolin magnetic composite was prepared by oxidative precipitation method. The morphology and composition of Fe3O4/Kaolin magnetic composite were characterized by laser particle size analyzer, SEM and XRD, respectively. The saturation adsorption capacity and magnetic separation recovery of Cu2+ was tested. It is demonstrated that 3.0 g Fe3O4 is the optimal amount as additive in Fe3O4/Kaolin magnetic composite to achieve improved adsorption ability (17.98 mg/g). The saturation magnetization reaches about 16.19 emu/g by hysteresis loop, which shows excellent magnetic response. In addition, the adsorption data of the Fe3O4/Kaolin magnetic composite were fitted by Langmuir and Freundlich adsorption isotherm. It is found that the adsorption behavior of Fe3O4/Kaolin for Cu2+ is basically consistent with the Langmuir adsorption isotherm model and the Freundlich adsorption isotherm model, indicating both monolayer adsorption and multi-layer adsorption are existed in the adsorption behavior of the Fe3O4/Kaolin magnetic composite for Cu2+.-
Key words:
- Kaolin /
- oxidative precipitation /
- Fe3O4 /
- Cu2+ /
- absorption
点击查看大图
计量
- 文章访问数: 796
- PDF下载量: 295
- 被引次数: 0