...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Microbe Encapsulation for Selective Rare-Earth Recovery from Electronic Waste Leachates
【24h】

Microbe Encapsulation for Selective Rare-Earth Recovery from Electronic Waste Leachates

机译：从电子垃圾渗滤液中选择性回收稀土的微生物包封

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Rare earth elements (REEs) are indispensable components of many green technologies and of increasing demand globally. However, refining REEs from raw materials using current technologies is energy intensive and enviromentally damaging. Here, we describe the development of a novel biosorption-based flow-through process for selective REE recovery from electronic wastes. An Escherichia coli strain previously engineered to display lanthanide-binding tags on the cell surface was encapsulated within a permeable polyethylene glycol diacrylate (PEGDA) hydrogel at high cell density using an emulsion process. This microbe bead adsorbent contained a homogenous distribution of cells whose surface functional groups remained accessible and effective for selective REE adsorption. The microbe beads were packed into fixed-bed columns, and breakthrough experiments demonstrated effective Nd extraction at a flow velocity of up to 3 m/h at pH 4-6. The microbe bead columns were stable for reuse, retaining 85% of the adsorption capacity after nine consecutive adsorption/desorption cycles. A bench-scale breakthrough curve with a NdFeB magnet leachate revealed a two-bed volume increase in breakthrough points for REEs compared to non-REE impurities and 97% REE purity of the adsorbed fraction upon breakthrough. These results demonstrate that the microbe beads are capable of repeatedly separating REEs from non-REE metals in a column system, paving the way for a biomass-based REE recovery system.
机译：稀土元素（REEs）是许多绿色技术和全球需求增长必不可少的组成部分。然而，使用当前技术从原材料精制稀土元素是高能耗的，并且对环境造成破坏。在这里，我们描述了一种新型的基于生物吸附的流通过程的发展，该流程可从电子废物中选择性地回收REE。使用乳化工艺，将以前经过工程设计以在细胞表面显示镧系元素结合标签的大肠杆菌菌株以高细胞密度封装在可渗透的聚乙二醇二丙烯酸酯（PEGDA）水凝胶中。这种微珠吸附剂包含细胞的均匀分布，其表面官能团仍然可访问且对选择性REE吸附有效。将微生物珠粒填充到固定床色谱柱中，突破性实验表明，在pH值为4-6时，流速高达3 m / h的Nd提取有效。微珠柱可稳定地重复使用，在连续九次吸附/解吸循环后保留了85％的吸附容量。使用NdFeB磁铁浸出液的工作台尺寸穿透曲线显示，与非REE杂质相比，REE的穿透点增加了两床体积，穿透后吸附级分的REE纯度为97％。这些结果表明，微生物珠能够在色谱柱系统中反复从非稀土金属中分离出稀土元素，从而为基于生物质的稀土回收系统铺平了道路。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号