• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Fifth International Conference on Ion Exchange Processes held on 5-9 July 1998 at Plas Coch College, The North East Wales Institute, Wrexham, UK >Ion exchange properties of oxides and hydrous oxides of pentavalent metas
【24h】

Ion exchange properties of oxides and hydrous oxides of pentavalent metas

机译：五价间位氧化物和水合氧化物的离子交换性质

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

Until now, many investigators have continued to seek new inorganic ion exchange materials because of their specialized properties such as resistance to high temperature and radiation fields. The most important groups of inorganic ion exchangers are clay mineral, zeolites, hydrous oxides, insoluble acid salts, heteropolyacids, and hexacyanoferrates~(1-5). Some inorgainc ion exchangers exhibit excellent high selectivities with respect to certain elements or groups of elements. Inorganic ion exchangers usualy have a rigid structure and do not undergo any appreciable dimensional changes during the ion exchange reaction. The rigid structure causes specific and unusual selectivities~6. The effective ionic radii of the central metal in the oxides are plotted against the valency of the metal in Fig. 1. The metals with low valency and large ionic radius give soluble hydroxides(group I), while metals with high valency and smal ionic radius give soluble oxyacids(group III). Metals in the intermediate range give insoluble hydroxide or hydroxides. The oxides listed in the region of group II are best suited to use as ion exchange materials. Among many hydrous oxides of various metals, hydrous oxides of pentavalent metals show cation exchange properties with relatively high acidity and cation exchange capacity~(7,8).
机译：到现在为止，许多研究人员一直在寻求新的无机离子交换材料，因为它们具有诸如耐高温和辐射场的特性。无机离子交换剂最重要的种类是粘土矿物，沸石，水合氧化物，不溶性酸盐，杂多酸和六氰合铁酸盐（1-5）。对于某些元素或元素组，某些无机金属离子交换剂表现出极好的高选择性。无机离子交换剂通常具有刚性结构，并且在离子交换反应过程中不会发生任何明显的尺寸变化。刚性结构导致特定和异常的选择性〜6。氧化物中中心金属的有效离子半径与金属的化合价作图。图1中的低化合价和大的离子半径的金属给出了可溶的氢氧化物（I组），而高化合价和较小的离子半径的金属产生可溶性含氧酸（Ⅲ类）。中等范围的金属产生不溶的氢氧化物。第II组区域中列出的氧化物最适合用作离子交换材料。在多种金属的许多水合氧化物中，五价金属的水合氧化物具有较高的酸度和阳离子交换能力，具有阳离子交换性能[7,8]。

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