• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied clay science >Adsorption of chromate from aqueous solutions by HDTMA-modified clinoptilolite, glauconite and montmorillonite
【24h】

Adsorption of chromate from aqueous solutions by HDTMA-modified clinoptilolite, glauconite and montmorillonite

机译：HDTMA改性斜发沸石，青绿石和蒙脱石从水溶液中吸附铬酸盐

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

Adsorption of chromate on natural clinoptilolite (Cp), glauconite (Gl), and montmorillonite (Mt) treated with hexadecyl trirnethylammonium (HDTMA) bromide at amounts equivalent to 1.0 and 2.0 of their cation-exchange capacities (CEC) was investigated by batch study. In the case of the Cp and Gl, adsorption of HDTMA took place on the zeolite and clay mineral surfaces only and thus relates to the external CEC (ECEC). The amount of chromate removed from the solution by the organo-silicates continuously decreased with increasing pH in the range 13-10. The highest values were obtained at pH between 1.3 and 6, and decreased rapidly above pH 6. At an initial chromate concentration of 6.25 mmol/L, its amounts bound to the Cp, Gl and Mt modified using 1.0 CEC loadings of the surfactant were 47, 102, and 168 mmol/kg, respectively. When amount of HDTMA used was equivalent to 2.0 CEC of the silicate, these values increased to 182, 240, and 285 mmol/kg, respectively. The results obtained suggest that the surfactant molecules, bound beyond the CEC to the external surfaces of the Cp and Gl, show a greater chromate adsorption ability in comparison with such molecules located in the interlayer spaces of the Mt. It is also evident that an excess of the surfactant, not adsorbed on the silicate surfaces, participated in the removal of chromate from the solution by formation of a precipitate of alkylammonium chromate.
机译：通过分批研究研究了用十六烷基三甲基乙铵（HDTMA）溴处理的天然斜发沸石（Cp），青石（Gl）和蒙脱石（Mt）上铬酸盐的吸附量，分别相当于其阳离子交换容量（CEC）的1.0和2.0。在Cp和G1的情况下，HDTMA仅在沸石和粘土矿物表面上发生吸附，因此与外部CEC（ECEC）有关。随着pH在13-10范围内的增加，有机硅酸盐从溶液中去除的铬酸盐量不断减少。在1.3和6之间的pH值下获得了最高值，在pH值6之上迅速降低。在初始铬酸盐浓度为6.25 mmol / L时，与表面活性剂1.0 CEC负载量修饰的Cp，Gl和Mt结合的量为47分别为102和168 mmol / kg。当HDTMA的使用量等于硅酸盐的2.0 CEC时，这些值分别增加到182、240和285 mmol / kg。所获得的结果表明，与位于Ct和G1的外表面上的CEC结合之外的表面活性剂分子与位于Mt的层间空间中的此类分子相比显示出更大的铬酸盐吸附能力。还明显的是，过量的未吸附在硅酸盐表面上的表面活性剂通过形成铬酸烷基铵盐的沉淀而参与了从溶液中去除铬酸盐的过程。

著录项

  • 来源
    《Applied clay science》 |2013年第12期|169-173|共5页
  • 作者

    Tomasz Bajda; Zenon Klapyta;

  • 作者单位

    Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al Mickiewicza 30,30-059 Krakow, Poland;

    Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al Mickiewicza 30,30-059 Krakow, Poland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cr(Ⅵ); Adsorption; Chromate; Organo-silicates; Alkylammonium surfactants;

    机译：六价铬吸附;铬酸盐;有机硅酸盐;烷基铵表面活性剂;

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