...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Adsorption and Reduction of Cr(Ⅵ) Together with Cr(Ⅲ) Sequestration by Polyaniline Confined in Pores of Polystyrene Beads
【24h】

Adsorption and Reduction of Cr(Ⅵ) Together with Cr(Ⅲ) Sequestration by Polyaniline Confined in Pores of Polystyrene Beads

机译：局限在聚苯乙烯微珠孔中的聚苯胺对Cr（Ⅵ）的吸附和还原以及Cr（Ⅲ）的螯合

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 simultaneous reduction and sequestration of Cr(VI) from wastewater is desirable as a cost-effective and environmentally friendly approach. In this study, we execute a one-step facile synthesis strategy on polyaniline (PANI) composites based on aniline adsorption and polymerization on pores of millimeter-scale polystyrene balls (PANI@PS). The well-defined PANI@PS increased the removal capacity of Cr(VI) by 5.4 times, going from 43.6 (bulky PANI) to 233.7 mg g(-1) near neutral pH (6.0) instead of the pH 1-3 documented in other reports, which was higher than that of many reported adsorbents due to its porous structure, numerous interaction sites, and confinement effects in the polymer. Most importantly, PANI@PS could efficiently sequester positive Cr(III) after reducing Cr(VI) to Cr(III) due to its negative surface created by confinement effects confined to the nanopores of PS. Conversely, positively charged bulky PANI repelled electrostatically positive Cr(III); thus, additional precipitation or adsorption treatments were needed in practical applications. Moreover, a coating of PANI can protect PS, as a substrate and a composite, from irreversible damage due to the strong oxidation capacity of Cr(VI), which is another major concern in adsorbing strong oxidants using polymers. A novel strategy to regenerate the exhausted PANI@PS was efficiently executed based on the electrochemical redox reversibility of PANI. Finally, the comprehensive adsorption/reduction/sequestration of Cr on PANI@PS was elucidated in detail.
机译：从废水中同时还原和螯合Cr（VI）是一种经济高效且环保的方法。在这项研究中，我们对苯胺在毫米级聚苯乙烯球（PANI @ PS）孔上的吸附和聚合作用进行聚苯胺（PANI）复合材料的一步一步合成策略。定义明确的PANI @ PS将Cr（VI）的去除能力提高了5.4倍，从中性pH（6.0）附近的43.6（大块PANI）增至233.7 mg g（-1），而不是文献中记载的pH 1-3。其他报告，由于其多孔结构，众多的相互作用位点和对聚合物的限制作用，因此比许多报告的吸附剂要高。最重要的是，PANI @ PS可以将Cr（VI）还原为Cr（III），因为它的负表面是由局限于PS纳米孔的约束效应产生的，因此可以有效地隔离正Cr（III）。相反，带正电荷的大体积PANI排斥静电正Cr（III）；因此，在实际应用中需要额外的沉淀或吸附处理。而且，由于Cr（VI）的强氧化能力，PANI涂层可以保护PS（作为基材和复合材料）免受不可逆的损害，这是使用聚合物吸附强氧化剂的另一个主要问题。基于PANI的电化学氧化还原可逆性，有效地执行了一种新的再生PANI @ PS的策略。最后，详细阐述了Cr在PANI @ PS上的全面吸附/还原/螯合。

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