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首页> 外文期刊>Environmental Pollution >Simultaneous sorption and catalytic oxidation of trivalent antimony by Canna indica derived biochars
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Simultaneous sorption and catalytic oxidation of trivalent antimony by Canna indica derived biochars

机译：Cannaanna衍生生物炭同时吸附和催化氧化三价锑

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摘要

The simultaneous sorption and oxidation of Sb(III) on biochars were investigated using batch experiments. The biochars were derived from Canna indica at different pyrolysis temperatures (300-600 degrees C, referred as CIB300-CIB600), and characterized by FTIR, BET, XRD, SEM-EDS, EPR and Boehm titration. The Sb(III) sorption data could be well fitted by both the Langmuir and Freundlich models, and the pseudo second order model is best for describing the kinetic data. The maximum Sb(III) sorption capacity of CIB300 was 16.1 mg g(-1), which was greater than that of other biochars. Inner-sphere complexation with oxygen-containing functional groups and coordination with is electrons are the possible sorption mechanisms. It is worthwhile to note that 4.7-32.3% of Sb(III) was oxidized to Sb(V) after sorption equilibration, demonstrating the occurrence of Sb(III) oxidation during the sorption process. Further study of oxidation under anoxic condition confirmed the catalytic role of biochar for Sb(III) oxidation, and free radicals in biochars were crucial for electron transfer. CIB400 exhibited the highest catalytic oxidative ability for Sb(III), which could be ascribe to its reserve of more electroactive polyphenolic macromolecule and less electroinactive cellulose. These results imply that biochars have good potential as a green effective sorbent for remediation of Sb(III) contaminated water, and simultaneously reduce the toxicity of Sb(III) by catalytic oxidation. (C) 2017 Elsevier Ltd. All rights reserved.
机译：使用分批实验研究了Sb（III）在生物炭上的同时吸附和氧化。这些生物炭是在不同热解温度（300-600摄氏度，称为CIB300-CIB600）下从印度大麻提取的，并通过FTIR，BET，XRD，SEM-EDS，EPR和Boehm滴定进行表征。 Langmuir和Freundlich模型都可以很好地拟合Sb（III）吸附数据，而伪二级模型最适合描述动力学数据。 CIB300的最大Sb（III）吸附容量为16.1 mg g（-1），比其他生物炭更大。与含氧官能团的内球络合以及与电子的配位是可能的吸附机理。值得注意的是，吸附平衡后，有4.7-32.3％的Sb（III）被氧化为Sb（V），这表明在吸附过程中Sb（III）发生了氧化。在缺氧条件下对氧化的进一步研究证实了生物炭对Sb（III）氧化的催化作用，而生物炭中的自由基对于电子转移至关重要。 CIB400对Sb（III）表现出最高的催化氧化能力，这可能归因于它具有更多的电活性多酚大分子和更少的电惰性纤维素。这些结果表明，生物炭具有良好的潜力，可以作为绿色有效的吸附剂来修复被Sb（III）污染的水，同时通过催化氧化降低Sb（III）的毒性。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Environmental Pollution》 |2017年第10期|394-402|共9页
  • 作者

    Cui Xiaoqiang; Ni Qijun; Lin Qiang; Khan Kiran Yasmin; Li Tingqiang; Khan Muhammad Bilal; He Zhenli; Yang Xiaoe;

  • 作者单位

    Zhejiang Univ, Coll Environm & Resource Sci, Minist Educ Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Zhejiang, Peoples R China;

    China Shipbldg Ind Corp, Res Inst 702, Wuxi 214082, Peoples R China;

    Zhejiang Univ, Coll Environm & Resource Sci, Minist Educ Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Zhejiang, Peoples R China;

    Zhejiang Univ, Coll Environm & Resource Sci, Minist Educ Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Zhejiang, Peoples R China;

    Zhejiang Univ, Coll Environm & Resource Sci, Minist Educ Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Zhejiang, Peoples R China;

    Zhejiang Univ, Coll Environm & Resource Sci, Minist Educ Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Zhejiang, Peoples R China;

    Univ Florida, Inst Food & Agr Sci, Soil & Water Sci Dept, Indian River Res & Educ Ctr, Ft Pierce, FL 34945 USA;

    Zhejiang Univ, Coll Environm & Resource Sci, Minist Educ Key Lab Environm Remediat & Ecol Hlth, Hangzhou 310058, Zhejiang, Peoples R 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

    Biochar; Antimony; Sorption characteristics; Catalytic oxidation;

    机译：生物炭锑吸附特性催化氧化;

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