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首页> 外文期刊>The Science of the Total Environment >Microcystin-LR sorption and desorption by diverse biochars: Capabilities, and elucidating mechanisms from novel insights of sorption domains and site energy distribution
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Microcystin-LR sorption and desorption by diverse biochars: Capabilities, and elucidating mechanisms from novel insights of sorption domains and site energy distribution

机译：多种Biochars的微囊糖素-LR吸附和解吸：能力，并阐明了吸附域的新洞察力和现场能量分布的机制

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摘要

This study accurately assessed microcystin-LR (MCLR)-trapping capabilities of diverse biochars based on sorption and sequential desorption (SDE), and elucidated MCLR sorption-desorption mechanisms from novel views of sorption domains and site energy distribution along sorption-SDE process. Results showed that maize straw bio-char (MSB) and chicken manure biochar (CMB) excelled in trapping MCLR (91.0%-97.4% and 85.7%-96.4%, respectively, at 60-600 μg/L of initial MCLR amount), followed by their respective HCl-treated ones (HCMB, HSMB), while HCl-treated bamboo biochar and pine sawdust biochar poorly trapped MCLR (48.9%-77.8% for HBB, 22.6%-67.2% for HPSB). Non-partition sorption domains (NPSD) contributed more than partition sorption domain (PSD) to MCLR sorption by each biochar. Higher NPSD contribution to MCLR sorption in CMBs and MSBs than other biochars resulted from their higher pH_(PZC) and mesoporosity, which provided stronger electrostatic and pore-filling interaction for MCLR. Desorption hysteresis was weaken with rising aqueous MCLR amount for most biochars. Along SDE process, remaining MCLR in PSD of MSBs, HPSB and HBB could transfer to NPSD, thus desorption ratio continuously decreased with increasing desorption cycle. Differently, remaining MCLR in NPSD of CMBs converted into PSD during 1st-3rd desorption, causing fluctuated desorption ratio without obvious decrease as desorption cycle increased. These implied that MCLR in PSD was more easily desorbed than NPSD for each biochar. Site energy distribution dynamics supported the results of PSD and NPSD contribution changes along SDE. This study was greatly implicated in cost-efficient emergent MCLR-pollution remediation and deeply understanding MCLR sorption-desorption mechanisms of diverse biochars.
机译：本研究基于吸附和序列解吸（SDE）准确评估了多种生物脉（MCLR）的分类能力，并阐明了沿着吸附 - SDE过程的吸附结构域和现场能量分布的新颖视图的MCLR吸附解吸机制。结果表明，玉米秸秆生物炭（MSB）和鸡肉粪便生物炭（CMB）在捕获MCLR（91.0％-97.4％和85.7％-96.4％，分别为60-600μg/ L初始MCLR量），其次是其各自的HCl处理的（HCMB，HSMB），而HCL处理的竹生物炭和松木淀粉生物炭捕获众多MCLR（HBB的48.9％-77.8％，HPSB为22.6％-67.2％）。非分区吸附结构域（NPSD）促进了每个生物炭的分区吸附结构域（PSD）到MCLR吸附。在CMBS和MSBS中的MCLR吸附更高的NPSD贡献比其较高的pH_（PZC）和中间孔隙率为MCLR导致的MCLR吸附，这为MCLR提供了更强的静电和孔隙填充相互作用。解吸滞后随着MCLR水溶性量的大多数生物脉。沿着SDE过程，剩余的MCLR在MSBS，HPSB和HBB的PSD中可以转移到NPSD，因此使用越来越多的解吸循环连续降低解吸比。不同地，在第13次解吸期间，在第1次解吸期间将CCLR在CMBS的NPSD中转换为PSD，由于解吸循环增加而导致波动的解吸比而没有明显降低。这些暗示PSD中的MCLR更容易被解吸而不是每个生物炭的NPSD。站点能量分配动态支持PSD和NPSD贡献的结果沿SDE变化。本研究大大涉及具有成本效益的新兴的MCLR污染修复，并深入了解不同的生物班的MCLR吸附解除机制。

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  • 来源
    《The Science of the Total Environment》 |2021年第1期|141921.1-141921.13|共13页
  • 作者

    Yue Yuan; Jieming Li; Haixiao Dai;

  • 作者单位

    College of Resources and Environmental Sciences China Agricultural University Beijing 100193 China Beijing Key Laboratory of Biodiversity and Organic Farming China Agricultural University Beijing 100193 China;

    College of Resources and Environmental Sciences China Agricultural University Beijing 100193 China Beijing Key Laboratory of Biodiversity and Organic Farming China Agricultural University Beijing 100193 China;

    College of Resources and Environmental Sciences China Agricultural University Beijing 100193 China Beijing Key Laboratory of Biodiversity and Organic Farming China Agricultural University Beijing 100193 China;

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  • 正文语种 eng
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  • 关键词

    Diverse biochars; Microcystin-LR-trapping ability; Sequential desorption; Site energy distribution; Sorption; Sorption domain;

    机译：不同的生物炸钟;微囊杆菌-LR捕获能力;顺序解吸;站点能量分配;吸附;吸附领域;

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