...
首页> 外文期刊>Environmental Science & Technology >Enhanced Oxidative and Adsorptive Removal of Diclofenac in Heterogeneous Fenton-like Reaction with Sulfide Modified Nanoscale Zerovalent Iron
【24h】

Enhanced Oxidative and Adsorptive Removal of Diclofenac in Heterogeneous Fenton-like Reaction with Sulfide Modified Nanoscale Zerovalent Iron

机译:硫化物修饰的纳米零价铁在非均相芬顿样反应中增强双氯芬酸的氧化和吸附去除作用

获取原文
获取原文并翻译 | 示例
           

摘要

Sulfidation of nanoscale zerovalent iron (nZVI) has shown some fundamental improvements on reactivity and selectivity toward pollutants in dissolved-oxygen (DO)-stimulated Fenton-like reaction systems (DO/S-nZVI system). However, the pristine microstructure of sulfide-modified nanoscale zerovalent iron (S-nZVI) remains uncovered. In addition, the relationship between pollutant removal and the oxidation of the S-nZVI is largely unknown. The present study confirms that sulfidation not only imparts sulfide and sulfate groups onto the surface of the nanoparticle (both on the oxide shell and on flake-like structures) but also introduces sulfur into the Fe(0) core region. Sulfidation greatly inhibits the four-electron transfer pathway between Fe(0) and oxygen but facilitates the electron transfer from Fe(0) to surface-bound Fe(III) and consecutive single-electron transfer for the generation of H_(2)O_(2) and hydroxyl radical. In the DO/S-nZVI system, slight sulfidation (S/Fe molar ratio = 0.1) is able to nearly double the oxidative removal efficacy of diclofenac (DCF) (from 17.8 to 34.2%), whereas moderate degree of sulfidation (S/Fe molar ratio = 0.3) significantly enhances both oxidation and adsorption of DCF. Furthermore, on the basis of the oxidation model of S-nZVI, the DCF removal process can be divided into two steps, which are well modeled by parabolic and logarithmic law separately. This study bridges the knowledge gap between pollutant removal and the oxidation process of chemically modified iron-based nanomaterials.
机译:纳米级零价铁(nZVI)的硫化已显示出在溶解氧(DO)刺激的Fenton类反应系统(DO / S-nZVI系统)中对污染物的反应性和选择性的一些根本改善。然而,硫化物修饰的纳米级零价铁(S-nZVI)的原始微观结构仍未发现。此外,污染物去除和S-nZVI氧化之间的关系在很大程度上是未知的。本研究证实,硫化不仅将硫化物和硫酸盐基团赋予纳米颗粒的表面(既在氧化物壳上,又在薄片状结构上),而且还将硫引入Fe(0)核心区域。硫化极大地抑制了Fe(0)和氧之间的四电子转移途径,但促进了电子从Fe(0)转移到表面结合的Fe(III)以及连续的单电子转移,从而生成H_(2)O_( 2)和羟基自由基。在DO / S-nZVI系统中,轻微的硫化(S / Fe摩尔比= 0.1)能够使双氯芬酸(DCF)的氧化去除效率几乎翻倍(从17.8%增至34.2%),而中等程度的硫化(S / Fe Fe摩尔比= 0.3)显着增强了DCF的氧化和吸附。此外,根据S-nZVI的氧化模型,DCF去除过程可分为两个步骤,分别由抛物线和对数定律很好地建模。这项研究弥合了化学改性铁基纳米材料在污染物去除与氧化过程之间的知识鸿沟。

著录项

  • 来源
    《Environmental Science & Technology》 |2018年第11期|6466-6475|共10页
  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China,Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, United States;

    Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, United States;

    State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;

    State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China,Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China;

    School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China;

    Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc Czech Republic;

    Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, Šlechtitelů 27, 783 71 Olomouc Czech Republic;

    State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China,Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China;

  • 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
  • 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