• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>ACS Symposium Series 890; Symposium on Nanotechnology and the Environment: Applications and Implications; ; >Dendritic Nanoscale Chelating Agents: Synthesis, Characterization, and Environmental Applications
【24h】

Dendritic Nanoscale Chelating Agents: Synthesis, Characterization, and Environmental Applications

机译：树状纳米级螯合剂：合成，表征和环境应用。

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

The complexation of metal ions is an acid-base reaction that depends on several parameters including (ⅰ) metal ion size and acidity, (ⅱ) ligand molecular architecture and basicity and (ⅲ) solution physicochemical conditions (1). Although macrocyles and their "open chain" analogues (unidentate and polydentate ligands) have been shown to form stable complexes with a variety of metal ions (1), their limited binding capacity (i.e. 1:1 complexes in most cases) is a major impediment to their utilization as high capacity chelating agents for industrial and environmental separations. Their relatively low molecular weights also preclude their effective recovery from wastewater by low cost membrane-based techniques (e.g., ultrafiltration). Moreover, their "uncontrolled" molecular composition, shape and size adversely impact their utilizations as templates for the synthesis of metal-bearing nanostructures with tunable electronic, magnetic, optical and catalytic activity. Recent advances in macromolecular chemistry such as the invention of dendritic polymers (2-3) are providing unprecedented opportunities to develop high capacity nanoscale chelating agents with well-defined molecular composition, size and shape. Dendrimers are relatively monodisperse and highly branched nanoparticles with controlled composition and architecture consisting of three components: a core, interior branch cells and terminal branch cells (2-3). These nanoparticles can be designed to encapsulate metal ions and metal clusters. The sequestered metal ions and clusters can be toxic metal ions such as Cu(Ⅱ), optically active metal ions such as Ag(v) and metal ions with catalytic properties such as Pd(Ⅱ)(4-6). This research explores the fundamental science of metal ion uptake by dendritic nanoscale chelating in aqueous solutions and assesses the extent to which this fundamental knowledge could be used to develop: (ⅰ) high capacity and reusable chelating agents for environmental separations and (ⅱ) redox and catalytically active nanoparticles with enhanced reactivity, selectivity and longevity for environmental detoxification.
机译：金属离子的络合是一种酸碱反应，它取决于几个参数，包括（ⅰ）金属离子的大小和酸度，（ⅱ）配体分子的结构和碱度以及（ⅲ）溶液的物理化学条件（1）。尽管已经证明大分子及其“开链”类似物（相同的和多齿的配体）可以与多种金属离子形成稳定的络合物（1），但其有限的结合能力（即大多数情况下为1：1的络合物）是主要障碍。用作工业和环境分离的高容量螯合剂。它们相对较低的分子量也妨碍了它们通过低成本的基于膜的技术（例如超滤）从废水中有效回收。而且，它们的“不受控制的”分子组成，形状和大小不利地影响了它们作为模板的用途，该模板用于合成具有可调的电子，磁性，光学和催化活性的含金属纳米结构。大分子化学的最新进展，例如树突状聚合物（2-3）的发明，为开发具有明确定义的分子组成，大小和形状的高容量纳米级螯合剂提供了前所未有的机会。树枝状聚合物是相对单分散的，高度分支的纳米颗粒，其组成和结构受控制，由三个部分组成：核心，内部分支细胞和末端分支细胞（2-3）。这些纳米颗粒可以设计成包封金属离子和金属簇。螯合的金属离子和簇可以是有毒金属离子，例如Cu（Ⅱ），旋光金属离子，例如Ag（v）和具有催化性能的金属离子，例如Pd（Ⅱ）（4-6）。这项研究探索了树枝状纳米级螯合剂在水溶液中吸收金属离子的基础科学，并评估了该基础知识可用于开发的程度：（ⅰ）用于环境分离的高容量和可重复使用的螯合剂，以及（ⅱ）氧化还原和具有增强的反应活性，选择性和长寿命的催化活性纳米颗粒，可用于环境排毒。

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