• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Role of phase transformation of barium perborates in the effective removal of boron from aqueous solution via chemical oxo-precipitation
【24h】

Role of phase transformation of barium perborates in the effective removal of boron from aqueous solution via chemical oxo-precipitation

机译：通过化学氧气沉淀，钡钡钡钡钡的作用在水溶液中有效除去硼

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

This work developed a chemical oxo-precipitation (COP) process for the removal of boron from aqueous solution. Hydrogen peroxide was utilized to convert boric acid to perborate anions, which precipitated directly with barium as barium perborates, and so efficiently reduced the boron level via phase transformation at room temperature. Several experimental parameters were investigated to evaluate the appropriate conditions for the phase transformation, including the pretreatment time and pH (of the mixture of boric acid with hydrogen peroxide), the reaction pH and the molar ratios of hydrogen peroxide and barium to boron. The results revealed that the reaction time of COP was shortened due to the speciation of perborate anions during pretreatment. The reaction pH(r) was crucial for COP because the phase transformation of barium perborates only occurred at a pH range of 8.5-10. Under optimal conditions - initial [H2O2]/[B] = 2, [Ba]/[B] = 0.8, pH(p) = 10.5 +/- 0.1, time(p) = 20 minutes, and pH(r) = 10 +/- 0.2 - the boron concentration was reduced from 1000 ppm to less than 3 ppm in 3 hours.
机译：这项工作开发了一种化学氧沉淀（COP）方法，用于从水溶液中除去硼。使用过氧化氢将硼酸转化为过硼酸盐阴离子，其直接用钡作为钡硼酸钡沉淀，并通过在室温下通过相转变有效地降低了硼水平。研究了几种实验参数以评估相变的适当条件，包括预处理时间和pH（硼酸与过氧化氢的混合物），反应pH和过氧化氢的摩尔比和硼的摩尔比。结果表明，由于预处理期间的过硼酸盐阴离子的形态，COP的反应时间缩短。反应pH（R）对于COP至关重要，因为钡过硼酸钡的相变仅发生在8.5-10的pH范围内。在最佳条件下 - 初始[H 2 O 2] / [B] = 2，[Ba] / [b] = 0.8，pH（p）= 10.5 +/- 0.1，时间（p）= 20分钟，pH（r）= 10 +/- 0.2 - 硼浓度在3小时内从1000ppm降低至小于3ppm。

著录项

  • 来源
    《RSC Advances》 |2016年第68期|共8页
  • 作者

    Lin Jui-Yen; Shih Yu-Jen; Hsieh Tsung-Yu; Huang Yao-Hui;

  • 作者单位

    Natl Cheng Kung Univ Dept Chem Engn Tainan 701 Taiwan;

    Univ Delaware Dept Civil &

    Environm Engn Newark DE 19716 USA;

    Natl Cheng Kung Univ Dept Chem Engn Tainan 701 Taiwan;

    Natl Cheng Kung Univ Dept Chem Engn Tainan 701 Taiwan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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