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首页> 外文期刊>Environmental Science & Technology >Determination of Instinct Components of Biomass on the Generation of Persistent Free Radicals (PFRs) as Critical Redox Sites in Pyrogenic Chars for Persulfate Activation
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Determination of Instinct Components of Biomass on the Generation of Persistent Free Radicals (PFRs) as Critical Redox Sites in Pyrogenic Chars for Persulfate Activation

机译：测定生物量对持续自由基（PFRS）作为过硫酸盐活化的临界氧化还原位的临界氧化还原位点的测定

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摘要

Persulfate (PS) activation on biochar (BC) is a promising technology for degrading the aqueous organic contaminants. However, the complexity of activation mechanisms and components in biomass that used to produce BC makes it difficult to predict the performance of PS activation. In this study, we employed eight sludges as the representative biomass that contained absolutely different organic or inorganic components. Results showed that the elemental composition, surface properties, and structures of the sludge-derived BCs (SBCs) clearly depended on the inherent components in the sludges. The intensities of persistent free radicals (PFRs) in the electron paramagnetic resonance (EPR) correlated positively with N- containing content of sludges as electron shuttle, but negatively with the metal content as electron acceptor. Linking with PFRs as crucial sites of triggering a radical reaction, a poly-parameter relationship of predicting PS activation for organic degradation using the sludge components was established (k_(obs,PN) = 0-004 × C_(protein) + 0.16 × C_M~(-0.895) -0.118). However, for the PS activation on those SBCs without PFRs, this redox process only relied on the sorption or conductivity-related characteristics, not correlating with the content of intrinsic components in biomass but with pyrolysis temperatures. This study provided insightful information of predicting the remediation efficiency of PS activation on BCs and further understanding the fate of contaminants and stoichiometric efficiency of oxidants in a field application.
机译：Persulfate（PS）活化对生物炭（BC）是一种有助于降解含水有机污染物的有希望的技术。然而，用于产生BC的生物量的激活机制和组分的复杂性使得难以预测PS激活的性能。在这项研究中，我们雇用了八个污泥作为具有绝对不同的有机或无机成分的代表性生物量。结果表明，污泥衍生的BCS（SBCS）的元素组成，表面性质和结构清楚地依赖于污泥中的固有成分。电子顺磁共振（EPR）中持续自由基（PFRS）的强度正相关，含N-含N-污泥的含量作为电子梭，但与金属含量呈负负接受。与PFR作为触发自由基反应的关键位点，建立了使用污泥组分预测PS激活的聚参数关系（K_（OB，PN）= 0-004×C_（蛋白）+ 0.16×C_M 〜（-0.895）-0.118）。然而，对于在没有PFR的那些SBC上的PS激活，该氧化还原过程仅依赖于吸附或导电性相关的特征，而不是与生物质中固有组分的含量相关但具有热解温度的相关性。本研究提供了预测BCS对PS激活的修复效率的富有识别信息，进一步了解污染物的命运和氧化剂的化学计量效率。

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  • 来源
    《Environmental Science & Technology》 |2021年第11期|7690-7701|共12页
  • 作者

    Wei Wu; Shishu Zhu; Xiaochen Huang; Wei Wei; Chao Jin; Bing-Jie Ni;

  • 作者单位

    State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 P. R. China;

    School of Environmental Science and Engineering Sun Yat-Sen University Guangzhou 510275 P. R. China;

    School of Agriculture Sun Yat-Sen University Guangzhou 510275 P. R. China;

    Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology Sydney Sydney NSW 2007 Australia;

    School of Environmental Science and Engineering Sun Yat-Sen University Guangzhou 510275 P. R. China;

    Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology Sydney Sydney NSW 2007 Australia;

  • 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

    black carbon; in situ chemical oxidation; structure-activity relationship; single-electron transfer; transformation of contaminants;

    机译：黑碳;原位化学氧化;结构活动关系;单电子转移;污染物的转化;

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