首页> 外文期刊>Environmental Science & Technology >Electrochemical Regeneration of Activated Carbon Cloth Exhausted with Bentazone
【24h】

Electrochemical Regeneration of Activated Carbon Cloth Exhausted with Bentazone

机译:Bentazone耗尽活性炭布的电化学再生

获取原文
获取原文并翻译 | 示例
           

摘要

The electrochemical regeneration of an activated carbon cloth exhausted with a common herbicide (bentazone) was investigated under different operating conditions. The reversibility of the desorption process was confirmed by monitoring the UV spectra of the solution while cathodic polarization is being applied. Neither nanotextural nor chemical changes are produced in the carbon cloth upon polarization in the absence of the adsorbate. Upon cathodic polarization of a carbon cloth working electrode preloaded with bentazone, negative charges appear on the surface. A partial bentazone desorption results from repulsive electrostatic interactions between the negative charges on the carbon cloth and bentazone. When the electrode potential is below the thermodynamic value for cathodic decomposition of water, hydroxyl ions are liberated. Such ions provoke local pH changes that are responsible of the dissociation of bentazone and carbon surface groups to their anionic form. As a consequence of the pH increase, an almost reversible desorption of bentazone is observed. The effects of several operating parameters on the regeneration efficiency were evaluated. Higher regeneration efficiencies were attained under potentiostatic as compared to galvanostatic conditions, as OH~- production strongly depends on the applied potential.
机译:在不同的操作条件下研究了用普通除草剂(bentazone)耗尽的活性炭布的电化学再生。解吸过程的可逆性通过在施加阴极极化时监测溶液的UV光谱来确认。在不存在被吸附物的情况下极化时,碳布中不会产生纳米结构或化学变化。在预先装载了苯达松的碳布工作电极发生阴极极化时,表面会出现负电荷。碳纤维布上的负电荷与苯达松之间的排斥性静电相互作用导致苯达松的部分脱附。当电极电位低于水的阴极分解的热力学值时,释放出氢氧根离子。此类离子引起局部pH值变化,这导致苯达松和碳表面基团解离为其阴离子形式。 pH升高的结果是,观察到苯达松几乎可逆地解吸。评估了几个操作参数对再生效率的影响。与恒电流条件相比,在恒电位条件下可获得更高的再生效率,因为OH-的产生强烈取决于所施加的电势。

著录项

  • 来源
    《Environmental Science & Technology》 |2008年第12期|p.4500-4506|共7页
  • 作者单位

    CRMD, CNRS-University, IB rue de la Ferollerie, 45071 Orleans, France;

  • 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);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 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