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Characterization and adsorption performance of biochars derived from three key biomass constituents

机译：三个关键生物质成分衍生的生物脉基的表征及吸附性能

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摘要

The effects of biomass constituents on biochar adsorption performance are still unclear. In this work, three main biomass constituents, lignin, cellulose and xylan (hemicellulose), were converted into biochar. These biochars showed obvious differences, which were observed by physicochemical characteristics analysis. Based on the acid-base titration, the contents of functional groups on different biochars decreased as lignin hemicellulose cellulose. The findings from elemental analyses showed that the degree of lignin pyrolysis was lower than cellulose and hemicellulose; however, lignin biochar had the highest yield and ash content. The scanning electron micrographs demonstrated that both lignin and xylan biochars were similarly spherical, while cellulose biochar was fibrous. Furthermore, the sulfadimidine (SMT) adsorption experiments revealed that physicochemical characteristics of biochars obviously affected the adsorption behavior. Cellulose and xylan biochars indicated similar pH-dependent sorption patterns, but the latter exhibited higher adsorption capacity. In contrast, lignin biochar had no adsorption capacity due to the high ash content. The adsorption was dominated by the electrostatic repulsion, EDA interactions, hydrogen bonds and negative charge-assisted hydrogen-bond. Overall, these observations are of significant importance for guiding in the selection of feedstock used for biochar preparation and predicting the sorption behavior of SMT on biochars.
机译：生物质成分对生物炭吸附性能的影响尚不清楚。在这项工作中，三种主要的生物量成分，木质素，纤维素和木聚糖（半纤维素）转化为生物炭。这些生物触盘显示出明显的差异，通过物理化学特征分析观察到。基于酸碱滴定，不同生物脉冲的官能团的含量减少为木质素>半纤维素>纤维素。元素分析的发现表明，木质素热解的程度低于纤维素和半纤维素;然而，木质素Biochar具有最高的产量和灰分含量。扫描电子显微照片表明，木质素和木质生物肢同样是球形的，而纤维素生物炭是纤维状的。此外，磺酰咪啶（SMT）吸附实验表明，生物脉冲的物理化学特征显然影响了吸附行为。纤维素和木聚糖Biochars表明了类似的pH依赖性吸附模式，但后者表现出较高的吸附能力。相比之下，木质素Biochar由于高灰分含量没有吸附容量。吸附是由静电排斥，EDA相互作用，氢键和负电荷辅助氢键的主导。总体而言，这些观察结果对于指导用于生物炭制剂的原料和预测SMT对Biochars的吸附行为的原料具有重要意义。

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  • 来源
    《Fuel》 |2020年第1期|117142.1-117142.7|共7页
  • 作者

    Wan Jiang; Liu Lin; Ayub Khurram Shahzad; Zhang Wei; Shen Genxiang; Hu Shuangqing; Qian Xiaoyong;

  • 作者单位

    East China Univ Sci & Technol State Environm Protect Key Lab Environm Risk Asse Sch Resource & Environm Engn Shanghai 200237 Peoples R China;

    East China Univ Sci & Technol State Environm Protect Key Lab Environm Risk Asse Sch Resource & Environm Engn Shanghai 200237 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China;

    East China Univ Sci & Technol State Environm Protect Key Lab Environm Risk Asse Sch Resource & Environm Engn Shanghai 200237 Peoples R China|Univ Gujrat Dept Chem Engn Gujrat Pakistan;

    East China Univ Sci & Technol State Environm Protect Key Lab Environm Risk Asse Sch Resource & Environm Engn Shanghai 200237 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China;

    Shanghai Acad Environm Sci Shanghai 200233 Peoples R China;

    Shanghai Acad Environm Sci Shanghai 200233 Peoples R China;

    Shanghai Acad Environm Sci Shanghai 200233 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biochar; Biomass constituents; Characterization; Sulfadimidine; Sorption;

    机译：生物炭;生物质成分;表征;磺酰咪啶;吸附;

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