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首页> 外文期刊>Journal of Hazardous Materials >Removal of chromium (Ⅵ) from water by porous carbon derived from corn straw: Influencing factors, regeneration and mechanism
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Removal of chromium (Ⅵ) from water by porous carbon derived from corn straw: Influencing factors, regeneration and mechanism

机译：玉米秸秆中多孔碳去除水中铬（Ⅵ）的影响因素，再生机理

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摘要

Porous carbon is one of the most widely used materials to remove Cr(VI) from polluted water. Here we reported one efficient porous carbon material prepared from corn straw. The results of Fourier transform infrared spectroscopy (FTIR), Energy dispersion spectrum (EDS), and X-ray photoelectron spectroscopy (XPS) indicated that the porous carbon surface had functional groups such as -COOH, OH and C-O-C, etc, which could be acted as active sites during the adsorption process. Brunauer-Emmett-Teller (BET) results showed that the surface area and total pore volume of the adsorbent were 2131.181 m(2)/g and 1.128 cm(3)/g, respectively. The percentages of micropore surface area and micropore volume achieved 91.93% and 80.43%, respectively. The maximum adsorption capacity of Cr(VI) was 175.44 mg/g at 25 degrees C with the well-developed microporous structure and abundant oxygen-containing functional groups of porous carbon. The adsorption process was well described by the pseudo-second order model and Langmuir adsorption isotherm model. It was mainly based on chemical adsorption of a single molecular layer, accompanied by ion exchange reaction, Cr(VI) reduction, and complexation, etc. The adsorbent exhibited excellent removal performance of Cr(VI) in the co-existing ions wastewater and electroplating wastewater, and could remain high removal performance for four adsorption-desorption cycles.
机译：多孔碳是从污水中去除六价铬的最广泛使用的材料之一。在这里，我们报道了一种由玉米秸秆制备的有效的多孔碳材料。傅里叶变换红外光谱（FTIR），能量色散光谱（EDS）和X射线光电子能谱（XPS）的结果表明，多孔碳表面具有-COOH，OH和COC等官能团，可以是在吸附过程中充当活性位点。 Brunauer-Emmett-Teller（BET）结果表明，吸附剂的表面积和总孔体积分别为2131.181 m（2）/ g和1.128 cm（3）/ g。微孔表面积和微孔体积的百分数分别达到91.93％和80.43％。 Cr（VI）在25摄氏度时的最大吸附容量为175.44 mg / g，具有良好的微孔结构和丰富的多孔碳含氧官能团。拟二阶模型和Langmuir吸附等温线模型很好地描述了吸附过程。它主要基于单分子层的化学吸附，并伴随离子交换反应，Cr（VI）还原和络合等。吸附剂在共存离子废水和电镀中表现出优异的Cr（VI）去除性能。废水，并且可以在四个吸附-解吸循环中保持较高的去除性能。

著录项

  • 来源
    《Journal of Hazardous Materials》 |2019年第5期|550-560|共11页
  • 作者

    Ma Hongfang; Yang Juanjuan; Gao Xiang; Liu Zhibao; Liu Xinxin; Xu Zhaogui;

  • 作者单位

    Qilu Univ Technol, Shandong Acad Sci, Sch Environm Sci & Engn, Jinan 250353, Shandong, Peoples R China|Qilu Univ Technol, Shandong Acad Sci, Sch Chem & Pharmaceut Engn, Inst Adv Energy Mat & Chem, Jinan 250353, Shandong, Peoples R China|Shandong Jianzhu Univ, Sch Mat Sci & Engn, Jinan 250101, Shandong, Peoples R China;

    Qilu Univ Technol, Shandong Acad Sci, Sch Environm Sci & Engn, Jinan 250353, Shandong, Peoples R China;

    Qilu Univ Technol, Shandong Acad Sci, Sch Chem & Pharmaceut Engn, Inst Adv Energy Mat & Chem, Jinan 250353, Shandong, Peoples R China;

    Qilu Univ Technol, Shandong Acad Sci, Sch Chem & Pharmaceut Engn, Inst Adv Energy Mat & Chem, Jinan 250353, Shandong, Peoples R China;

    Shandong Jianzhu Univ, Sch Mat Sci & Engn, Jinan 250101, Shandong, Peoples R China;

    Qilu Univ Technol, Shandong Acad Sci, Sch Environm Sci & Engn, Jinan 250353, Shandong, 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

    Porous carbon; Corn straw; Adsorption; Regeneration; Cr(VI);

    机译：多孔碳;玉米秸秆;吸附;再生;Cr（VI）;

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