提高生物吸收剂的稳定性,性能效率和成本效益:用于从水中隔离多种有毒金属的第三级磁性复合材料
Aleksandër Peqini1,2, Paul N Diagboya3, Seit Shallari2
1Institute of Soil Science and Soil Conservation, Research Centre for BioSystems, Land Use and Nutrition (iFZ), Justus Liebig University Giessen, Heinrich-Buff-Ring 26, Giessen 35392, Germany.
Langmuir : the ACS journal of surfaces and colloids
|June 2, 2025
概括
低成本的磁铁-生物炭-粘土复合材料有效地从水中去除,和铜等重金属. 这些磁吸附剂可重复使用,特别是用于去除,提供可持续的水处理解决方案.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学 化学 化学
背景情况:
- 水中的重金属污染对环境和健康构成重大风险.
- 开发具有成本效益和高效的吸附剂对于水资源整治至关重要.
- 磁性复合材料在分离和可重复使用方面具有优势,可用于水处理.
研究的目的:
- 为了合成和描述新的磁铁-生物炭-粘土 (MBC) 复合吸附剂.
- 评估MBC复合材料在从水溶液中去除Cd (II),Cr (VI) 和Cu (II) 的效率.
- 研究开发的吸附剂的吸附机制,动力学和可重复使用性.
主要方法:
- 使用磁纳米颗粒,生物炭和田粘土的一步合成MBC复合材料.
- 批量吸附实验以确定最佳条件 (固体/液体比,接触时间).
- 吸附异温和动力学研究,包括温度效应,以了解去除机制.
- 在多个吸附-脱附周期的重复使用性测试.
主要成果:
- 与原始粘土相比,MBC复合材料表现出增强的阴离子交换能力和BET表面积.
- 在0.66g/L的固体/液体比率下实现了最佳的去除,在720分钟时达到平衡.
- 吸附主要通过静电相互作用和孔隙吸附发生,涉及诸如 -OH, -COO和 -C-N 等功能群.
- 的存在增强了Cr的去除,但减少了Cd的吸收;Langmuir和Langmuir-Freundlich模型最好地描述了数据.
- 五个循环后,Cr (VI) 的去除率仍然很高,表明可重复使用性很好,而Cd (II) 和Cu (II) 则仅在第一个循环中表现出高效率.
结论:
- 合成的MBC复合物是一种具有成本效益和高效的吸附剂,用于从污染水中去除重金属.
- 磁性特性使其易于分离,使其适合于实际的水处理应用.
- 由于其稳定性和可重复使用性,MBC复合材料在去除Cr (VI) 方面特别有前途.
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