从废弃的LED灯中可持续地生物提取稀土元素
Sahba Nadi1, Fatemeh Pourhossein2, Seyyed Mohammad Mousavi3,4
1Biotechnology Group, Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran.
Scientific reports
|July 1, 2025
概括
这项研究优化了利用Acidithiobacillus thiooxidans从废弃的灯具中回收稀土元素 (REEs). 在最佳条件下,回收率为43%的前代和28%的新.
科学领域:
- * 环境科学 环境科学
- * 材料科学 材料科学
- * 生物技术 * 生物技术
背景情况:
- *稀土元素对现代技术至关重要,包括电子和可再生能源系统.
- *从废物流中有效地回收废弃能源,例如废弃灯,对于可持续性至关重要.
- *生物方法为REE提取提供了一个有希望的替代方案,减少了对苛刻化学过程的依赖.
研究的目的:
- *从废弃的LED (DLED) 灯中开发和优化一种生物除方法来提取可再生能源,特别是 (Nd) 和 (Pr),从废弃的LED灯中提取.
- *研究使用Acidithiobacillus thiooxidans优化生物硫酸生产的方法.
- *确定最大限度地回收REE的最佳条件 (纸密度,时间).
主要方法:
- *通过在9K培养基中使用元素硫的Acidithiobacillus thiooxidans的不同注射量 (2%,5%,10%v/v) 来优化生物硫酸生产.
- *生物化实验,以评估纸密度 (10-50 g/L) 和时间 (3天) 对利用生物生成酸的Nd和Pr回收的影响.
- *使用XRD,FTIR和SEM进行材料表征,以分析浸出对灯具组件的影响.
主要成果:
- * 5%的Acidithiobacillus thiooxidans的注射体量实现了最高的硫酸产量 (10,500 mg/L,160 mM H+).
- *最佳的生物浸条件被确定为10g/L的纸密度和3天的浸时间.
- * 在最佳条件下,得到的 (Pr) 的回收率为43%, (Nd) 的回收率为28%.
结论:
- * 该研究成功地展示了一种优化的生物溶解工艺,用于利用Acidithiobacillus thiooxidans从DLED灯中回收REEs.
- * 工艺参数,特别是纸密度和浸出时间,显著影响了REE回收的效率.
- *这种基于生物的方法提供了一种可行和可持续的方法,用于从电子废物中回收关键的稀土元素.
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