• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Water Pollution IX : Modelling, Monitoring and Management >Removal of mercury(Ⅱ) from wastewater using poly(vinyl pyrrolidinone)
【24h】

Removal of mercury(Ⅱ) from wastewater using poly(vinyl pyrrolidinone)

机译：聚乙烯吡咯烷酮去除废水中的汞（Ⅱ）

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

In this study a water soluble polymer, poly(vinyl pyrrolidinone) (PVP), was used for separation and preconcentration of Hg(Ⅱ) prior to their analysis by Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES). Poly(vinyl pyrrolidinone) polymers containing a pendant lactam ring which is part of a monomeric repeat unit structure can form complexes with target metal ions via oxygen and nitrogen. The Hg(Ⅱ) and polymer solution were mixed and Hg(Ⅱ)-bound polymer was precipitated upon addition of acetone. Adding saturated KNO3 solution to the sample, by the salting out effect, causes the precipitation to be completed faster with less amount of acetone. The precipitate was separated from the solution and dissolved directly with ultra deionised water. In this way, analyte elements were again transferred into the liquid phase and analysed by ICP-AES. The effects of pH, amount of the polymer, molecular weight of the polymer, Hg(Ⅱ) ion concentration and centrifuging time on the recovery of the target metal ion have been investigated. The equilibrium experimental data were fitted to Langmuir and Freundlich isotherms models. The maximum Hg(Ⅱ) adsorption capacity from aqueous solutions obtained was 30.4 mg/g at pH of about pH 6.0. Adsorption of heavy metal ions from artificial waste water was also studied. The adsorption capacities were 26.5 mg/g for Hg(Ⅱ), 20.2 mg/g for Cd(Ⅱ) and 15.3 mg/g for Pb(Ⅱ) with recoveries greater than 97% and relative standard deviations of lower than 3% n=5.
机译：本研究采用水溶性聚合物聚乙烯吡咯烷酮（PVP）对汞（Ⅱ）进行分离和预浓缩，然后通过电感耦合等离子体原子发射光谱法（ICP-AES）对其进行分析。包含作为单体重复单元结构一部分的内酰胺侧链的聚乙烯吡咯烷酮聚合物可通过氧和氮与目标金属离子形成络合物。混合Hg（Ⅱ）和聚合物溶液，并在加入丙酮后使与Hg（Ⅱ）结合的聚合物沉淀。通过盐析效应，将饱和的KNO3溶液添加到样品中，可以用更少的丙酮更快地完成沉淀。从溶液中分离出沉淀物，并直接用超去离子水溶解。这样，分析物元素再次转移到液相中，并通过ICP-AES进行分析。研究了pH值，聚合物量，聚合物分子量，Hg（Ⅱ）离子浓度和离心时间对目标金属离子回收率的影响。将平衡实验数据拟合到Langmuir和Freundlich等温线模型。在约pH 6.0的条件下，从水溶液中获得的最大Hg（Ⅱ）吸附能力为30.4 mg / g。还研究了人工废水中重金属离子的吸附。 Hg（Ⅱ）的吸附容量为26.5 mg / g，Cd（Ⅱ）的吸附容量为20.2 mg / g，Pb（Ⅱ）的吸附容量为15.3 mg / g，回收率大于97％，相对标准偏差小于3％。 5，

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