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A ClO-mediated photoelectrochemical filtration system for highly-efficient and complete ammonia conversion

机译：一种用于高效和完全氨转化的Clo介导的光电化学过滤系统

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摘要

The ability to convert excess ammonia in water into harmless N-2 is highly desirable for environmental remediation. We present a chlorine-oxygen radical (ClO)(center dot)-mediated photoelectrochemical filtration system for highly efficient and complete ammonia removal from water. The customized photochemical device comprised a Ag-functionalized TiO2 nanotube array mesh photoanode and a Pd-Cu co-modified nickel foam (Pd-Cu/NF) cathode. Under illumination, holes generated at the anode catalyzed the conversion of H2O and Cl- to HO center dot and Cl-center dot, respectively. In turn, these radicals then reacted further, yielding ClO,(center dot) which selectively decomposed ammonia. The cathode enabled further reduction of anodic byproducts such as NO3- to N-2. The complete oxidation of all dissolved ammonia was achieved within 15 min reaction under neutral conditions, where N-2 was the dominant product. The impact of key parameters was assessed, which enabled the discovery of optimal reaction conditions and the proposal of the underlying working mechanism. The flow-through configuration demonstrated a 5-fold increase of ammonia oxidation rate compared to the conventional batch reactor. The role of ClO center dot in the oxidation of ammonia was verified with electron paramagnetic resonance and scavenger studies. This study provided greater mechanistic insights into photoelectrochemical filtration technology and demonstrated the potential of future nanotechnology for removing ammonia.
机译：对于环境修复，非常需要将多余的氨转化为无害N-2的能力。我们呈氯 - 氧自由基（CLO）（CLO）（中心点）介导的光电化学过滤系统，用于高效且完全从水中去除氨。定制的光化学器件包括Ag官能化的TiO2纳米管阵列网光阳极和Pd-Cu共改性镍泡沫（Pd-Cu / NF）阴极。在照明下，阳极在阳极处产生的孔催化了H2O和CL-至HO中心点和CL中心点的转化。反过来，这些自由基进一步反应，产生ClO，（中心点），其选择性地分解氨。阴极使得能够进一步减少阳极副产物，例如NO 3至N-2。所有溶解氨的完全氧化在中性条件下15分钟内实现，其中N-2是优势产品。评估关键参数的影响，这使得能够发现最佳反应条件和潜在的工作机制的提议。与常规的批量反应器相比，流通结构表明，与常规批量反应器相比，氨氧化速率增加了5倍。 CLO中心点在氨氧化中的作用用电子顺磁共振和清除剂研究验证。本研究提供了更大的机械洞察力进入光电化学过滤技术，并证明了未来纳米技术的潜力用于去除氨。

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  • 来源
    《Journal of Hazardous Materials》 |2020年第5期|123246.1-123246.9|共9页
  • 作者

    Li Fang; Sun Liwen; Liu Yanbiao; Fang Xiaofeng; Shen Chensi; Huang Manhong; Wang Zhiwei; Dionysiou Dionysios D.;

  • 作者单位

    Donghua Univ Coll Environm Sci & Engn Text Pollut Controlling Engn Ctr Minist Environm Protect 2999 North Renmin Rd Shanghai 201620 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur 1239 Siping Rd Shanghai 200092 Peoples R China;

    Donghua Univ Coll Environm Sci & Engn Text Pollut Controlling Engn Ctr Minist Environm Protect 2999 North Renmin Rd Shanghai 201620 Peoples R China;

    Donghua Univ Coll Environm Sci & Engn Text Pollut Controlling Engn Ctr Minist Environm Protect 2999 North Renmin Rd Shanghai 201620 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur 1239 Siping Rd Shanghai 200092 Peoples R China;

    Donghua Univ Coll Environm Sci & Engn Text Pollut Controlling Engn Ctr Minist Environm Protect 2999 North Renmin Rd Shanghai 201620 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur 1239 Siping Rd Shanghai 200092 Peoples R China;

    Donghua Univ Coll Environm Sci & Engn Text Pollut Controlling Engn Ctr Minist Environm Protect 2999 North Renmin Rd Shanghai 201620 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur 1239 Siping Rd Shanghai 200092 Peoples R China;

    Donghua Univ Coll Environm Sci & Engn Text Pollut Controlling Engn Ctr Minist Environm Protect 2999 North Renmin Rd Shanghai 201620 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur 1239 Siping Rd Shanghai 200092 Peoples R China;

    Shanghai Inst Pollut Control & Ecol Secur 1239 Siping Rd Shanghai 200092 Peoples R China|Tongji Univ State Key Lab Pollut Control & Resource Reuse Sch Environm Sci & Engn Shanghai 200092 Peoples R China;

    Univ Cincinnati Environm Engn & Sci Program Cincinnati OH 45221 USA;

  • 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

    Photoelectrochemical filtration; ClO center dot; Ag-functionalized; TiO2 nanotube array; Ammonia conversion;

    机译：光电化学过滤;CLO中心点;Ag官能化;TiO2纳米管阵列;氨转换;

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