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Removal of chlorpyrifos from waste water by wheat straw-derived biochar synthesized through oxygen-limited method

机译：通过氧有限法合成的小麦秸秆衍生的生物炭从废水中除去氯吡啶

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摘要

Systematic studies have been performed for the first time to investigate the pyrolysis behavior of wheat straw and the adsorption mechanism of chlorpyrifos by wheat straw-derived biochar. FTIR and elemental analysis indicated that aromatic and hydrophobic substances are produced during the pyrolysis process of wheat straw. The BET results suggested that the pyrolysis temperature of wheat straw should be above 450 degrees C to acquire the biochar with a surface area above 60.0 m(2) g(-1). The adsorption experiments show that wheat straw-derived biochar at 750 degrees C (WS750) can effectively adsorb chlorpyrifos and the largest adsorption quantity is 16 mg g(-1). The driving force for chlorpyrifos adsorption by WS750 is most likely attributed to the pi center dot center dot center dot pi stack between the aromatic ring of chlorpyrifos and these aromatic areas on WS750 surface. The adsorption behaviors follow the pseudo-second kinetic and Freundlich models. Recycle experiments show that the adsorption ability of WS750 can be recovered by washing with methanol. The present study shows that wheat straw-derived biochar can work as a highly effective and low-cost adsorbent to remove chlorpyrifos from waste water.
机译：已经第一次进行了系统研究，以研究小麦秸秆的热解作用和小麦秸秆衍生的生物炭的吸附机制。 FTIR和元素分析表明，在小麦秸秆的热解过程中产生芳族和疏水物质。 BET结果表明，小麦秸秆的热解温应高于450℃，以获得高于60.0m（2 )g（-1）的表面积。吸附实验表明，750℃（WS750）的小麦秸秆衍生的生物炭可以有效吸附氯吡啶，最大的吸附量为16mg g（-1）。 WS750的抗菌剂吸附的驱动力最可能归因于紫外线芳香环和WS750表面上这些芳族区域之间的PI中心点中心点中心点PI堆叠。吸附行为遵循伪第二动态和Freundlich模型。再循环实验表明，通过用甲醇洗涤，可以回收WS750的吸附能力。本研究表明，小麦秸秆衍生的生物炭可以作为高效和低成本的吸附剂，以从废水中除去紫外线。

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  • 来源
    《RSC Advances》 |2015年第89期|共7页
  • 作者

    Wang Peifang; Yin Yayun; Guo Yong; Wang Chao;

  • 作者单位

    Hohai Univ Coll Environm Minist Educ Key Lab Integrated Regulat &

    Resource Dev Shallow Nanjing Peoples R China;

    Hohai Univ Coll Environm Minist Educ Key Lab Integrated Regulat &

    Resource Dev Shallow Nanjing Peoples R China;

    Hohai Univ Coll Environm Minist Educ Key Lab Integrated Regulat &

    Resource Dev Shallow Nanjing Peoples R China;

    Hohai Univ Coll Environm Minist Educ Key Lab Integrated Regulat &

    Resource Dev Shallow Nanjing Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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