...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Electrocatalysis >Electrodes Based on Zeolites Modified with Cobalt and/or Molybdenum for Pesticide Degradation. Part I: Physicochemical Characterization and Efficiency of the Electrodes for O-2 Reduction and H2O2 Production
【24h】

Electrodes Based on Zeolites Modified with Cobalt and/or Molybdenum for Pesticide Degradation. Part I: Physicochemical Characterization and Efficiency of the Electrodes for O-2 Reduction and H2O2 Production

机译：基于沸石的电极用钴和/或钼来进行农药降解。 第一部分：O-2还原和H2O2生产的电极的物理化学表征和效率

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

With the purpose of obtaining inexpensive electrodes for the degradation of organic pesticides by the electro-Fenton reaction, the required H2O2 being obtained by the 2-electron reduction of dissolved O-2, we have prepared glassy carbon electrodes coated with a mixture of graphite with Mo- and/or Co-modified zeolites. Three zeolites were used, Linde type A (ZA), Faujasite (ZY), and MFI (ZSM5), whose maximum possible cation exchange, directly given by the Al/Si ratio, and their hydrophilicity increases in the order ZSM5 ZY ZA. The zeolites were modified with Mo and/or Co by the wet impregnation method and characterized by different techniques. The outer surfaces of the three Mo-modified zeolites showed Mo-containing grains (in ZA) or needles (in ZY and ZSM5), which could be largely washed away with hot water. Electrodes were made by depositing on a disc of glassy carbon (GC) a mixture of graphite, zeolite, and a binder. Quite unexpectedly, the cyclic voltammograms (CVs) of the three Mo-modified zeolites showed at least five pairs of anodic-cathodic peaks, which we assume are due to the presence of the Mo7O246- isopolyoxomolybdate anion, proceeding from the impregnating solution, and anchored on the zeolites' surface. With a rotating ring-disc electrode, the highest efficiency for H2O2 production at -0.2V(RHE), namely, 12.7%, was obtained with the GC/graphite-(CoMo-exchanged ZA) electrode, but this efficiency decreased with time. On the contrary, the three zeolites modified only with Mo were stable in 4-h electrolyses at -0.2V(RHE) and yielded the highest H2O2 concentrations, which we attribute to the Mo7O246- isopolyoxomolybdate anchored on the zeolites. The H2O2 yield was the same for the three Mo-modified zeolites, irrespective of their exchange capacity and hydrophobic/hydrophilic character.
机译：通过通过电芬顿反应获得有机农药的廉价电极的目的，通过溶解O-2的2-电子减少获得所需的H 2 O 2，我们制备了涂有石墨混合物的玻璃碳电极Mo-和/或共改性的沸石。使用三沸石，林德型A（Za），Faujasite（ZY）和MFI（ZSM5），其最大可能的阳离子交换由Al / Si比直接给出，并且它们的亲水性ZSM5 ZSM5 Zsm5 Zsm5＆ zy＆ za。用湿浸渍方法用Mo和/或Co改性沸石，其特征在于不同的技术。三种Mo改性沸石的外表面显示出含MO的颗粒（在Za）或针（在Zy和ZSM5）中，其可以大大用热水洗掉。通过沉积在玻璃碳（GC）的盘上进行电极，石墨，沸石和粘合剂的混合物。非常出乎意料地，三个Mo改性沸石的循环伏安图（CVS）显示了至少五对阳极 - 阴极峰，我们假设是由于Mo7O246-异聚毒钼钼族聚合物的存在，从浸渍溶液中进行，并锚定在沸石表面上。通过旋转环形盘电极，用GC /石墨（Como-ExchangedZA）电极获得-0.2V（RHE）的H2O2产生的最高效率，即12.7％，但随着时间的推移，这种效率降低。相反，仅在-0.2V（RHE）的4-H电解中仅改性的三沸石在-0.2V（RHE）中稳定，得到了最高的H2O2浓度，我们将MO7O246-异聚毒催化剂归结在沸石上。对于三种Mo改性的沸石，H 2 O 2产率是相同的，而不管它们的交换能力和疏水/亲水性。

著录项

相似文献

  • 外文文献
  • 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