Preparation of highly-conductive pyrogenic carbon-supported zero-valent iron for enhanced Cr(Ⅵ) reduction

Zhao Mingyue; Zhang Changai; Yang Xianni; Liu Li; Wang Xiaozhi; Yin Weiqin; Li Yuncong C.; Wang Shengsen; Fu Weizhang

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Preparation of highly-conductive pyrogenic carbon-supported zero-valent iron for enhanced Cr(Ⅵ) reduction

机译：用于增强Cr（Ⅳ）减少的高导电溶性碳负载零价铁的制备

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In this work, electron transfer (ET) moiety of PC was ascertained in chromate (Cr(VI)) reduction by zero-valent iron supported by pyrogenic carbon (PC) (ZVI/PC) prepared by pyrolysis of hematite (alpha-Fe2O3)-treated pine-wood. X-ray diffraction analysis suggested successive phase transformation of alpha-Fe2O3 -magnetite (Fe3O4)- wustite (FeO)- ZVI (Fe degrees). Raman spectra and Brunauer-Emmett-Teller analysis revealed that ZVI/PC is characterized with more ordered graphitic carbon and greater surface area than pristine PC. Maximal Cr(VI) removal capacity (pH = 3) as predicted by Langmuir isotherm model were 5.78, 36.12 and 8.39g kg(-1) for PC, ZVI/PC and ZVI, respectively. ZVI/PC maintained significantly greater Cr(VI) removal capacity than ZVI and PC at pH 3-9, but Cr(VI) removal dropped rapidly to 6.78 g kg(-1) at pH 4 and above. X-ray photoelectron spectroscopy and successive desorption of Cr-laden ZVI/PC and ZVI showed trivalent Cr was the dominant species, suggesting reduction was an important mechanism for Cr(VI) detoxification. Electrochemical analysis demonstrated that ZVI/PC exhibited greater Tafel corrosion rate and ET quantity, with lower electrical resistance. Besides, Cr(VI) reduction showed reversal trend with electrical resistance of ZVI/PC. To conclude, ET capacity was closely associated with electrical conductivity of ZVI/PC due to intensified conducive graphitic carbon structure of PC at higher pyrogenic temperatures.

机译：在这项工作中，通过通过赤铁矿热解（α-Fe2O3）的热解（α-Fe2O3）制备的热解碳（PC）（ZVI / PC）支撑的铬酸盐（Cr（vi））减少的铬酸盐（Cr（VI））中确定了CP的电子转移（ET）部分。 - 杉木木材。 X射线衍射分析表明α-Fe2O3 -Magnetite（Fe3O4） - >威尔特（FeO） - > ZVI（Fe Degete）的连续相变。拉曼光谱和Brunauer-Emmett-Talker分析显示，ZVI / PC的特征在于具有比原始PC更有序的石墨碳和更大的表面积。 Langmuir等温模型预估的最大Cr（VI）去除容量（pH = 3）分别为PC，ZVI / PC和ZVI的5.78,36.12和8.39g kg（-1）。 ZVI / PC在pH 3-9的ZVI和PC保持明显较大的Cr（VI）去除容量，但在pH 4及以上的pH值下，去除Cr（VI）迅速下降至6.78g kg（-1）。 X射线光电子体光谱和Cr-Laden ZVI / PC和ZVI的连续解吸显示三价Cr是显性种类，表明还原是Cr（vi）排毒的重要机制。电化学分析表明，ZVI / PC表现出更大的Tafel腐蚀速率和ET量，具有较低的电阻。此外，Cr（vi）减少显示ZVI / PC电阻的反转趋势。为了得出结论，由于在较高的热源温度下，由于PC的强化电镀的电型碳结构，ET容量与ZVI / PC的电导率密切相关。

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来源
《Journal of Hazardous Materials》 |2020年第5期|122712.1-122712.10|共10页
作者
Zhao Mingyue; Zhang Changai; Yang Xianni; Liu Li; Wang Xiaozhi; Yin Weiqin; Li Yuncong C.; Wang Shengsen; Fu Weizhang;
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作者单位

Yangzhou Univ Coll Environm Sci & Engn Yangzhou 225127 Jiangsu Peoples R China;

Zhejiang Univ Sci & Technol Sch Environm & Nat Resources Hangzhou 310023 Peoples R China;

Yangzhou Univ Coll Environm Sci & Engn Yangzhou 225127 Jiangsu Peoples R China;

Yangzhou Univ Coll Environm Sci & Engn Yangzhou 225127 Jiangsu Peoples R China;

Yangzhou Univ Coll Environm Sci & Engn Yangzhou 225127 Jiangsu Peoples R China|Jiangsu Collaborat Innovat Ctr Solid Organ Waste Nanjing Peoples R China|Yangzhou Univ Minist Educ China Joint Int Res Lab Agr & Agriprod Safety Yangzhou 225127 Jiangsu Peoples R China;

Yangzhou Univ Coll Environm Sci & Engn Yangzhou 225127 Jiangsu Peoples R China;

Univ Florida Soil & Water Sci Dept Trop Res & Educ Ctr IFAS Homestead FL 33031 USA;

Yangzhou Univ Coll Environm Sci & Engn Yangzhou 225127 Jiangsu Peoples R China|Jiangsu Collaborat Innovat Ctr Solid Organ Waste Nanjing Peoples R China|Yangzhou Univ Minist Educ China Joint Int Res Lab Agr & Agriprod Safety Yangzhou 225127 Jiangsu Peoples R China;

Shandong Agr Univ Coll Resources & Environm Tai An 271018 Shandong Peoples R China;

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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
Pyrogenic carbon; Heavy metals; Soil remediation; Co-pyrolysis; Electron transfer;

机译：热原碳;重金属;土壤修复;共热解剖;电子转移;

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4. A Facile Preparation of Carbon-supported Nanoscale Zero-valent Iron Fibers [C] . Qingshan Kong, Chunxiang Guo, Bingbing Wang, IUMRS International Conference in Asia;IUMRS-ICA 2010 . 2011

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Preparation of highly-conductive pyrogenic carbon-supported zero-valent iron for enhanced Cr(Ⅵ) reduction

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