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首页> 外文期刊>Environmental Pollution >Contrasting microcystin-LR sorption and desorption capability of different farmland soils amended with biochar: Effects of biochar dose and aging time
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Contrasting microcystin-LR sorption and desorption capability of different farmland soils amended with biochar: Effects of biochar dose and aging time

机译：用生物炭修正了不同农田土壤的微囊虫-LR吸附和解吸能力：生物炭剂量和老化时间的影响

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摘要

This study explored biochar (BC) amendment effects on microcystin-LR (MCLR) concentration-dependent sorption and sequential desorption (SDE) by diverse soils to assess MCLR-trapping by BC-amended soils. Soil properties varied with rising BC dose and aging time. As aging proceeded, BC-amended soils shared a generally similar 'firstly increase and then decrease' trend of MCLR sorption and 'firstly decrease and then increase' trend of desorption at most cases. It appeared that MCLR sorption by BC-amended soils was most positively correlated with mesoporosity and surface basic functionality. BC-amendment increased MCLR-trapping for most soils, especially 4% BC at 3 month-aging maximized trapping ratio of GZ, SY and SX to 86.59%-95.43%, 80.01%- 87.20% and 78.73%-90.85%, respectively, at 50-500 mu g/L MCLR by largely increasing sorption and decreasing desorption. BC-amendment best matched GZ soil because MCLR-trapping of BC-amended GZ exceeded other amended soils at the same BC dose and aging time, but failed to obviously increase MCLR-trapping of HS soil at most cases, except only case with 2% BC at 3 month-aging. Site energy distribution verified that maximally enhanced MCLR-trapping of most soils was due to greatly enhanced sorption affinity during sorption and 1st desorption cycle, making closer MCLR-binding that more resistant to desorption. Contrarily, BC-amendment did not enhance sorption affinity of HS along sorption-SDE to compromise MCLR-trapping increase at most cases. This study validated 3 months as suitable BC-aging time to maximize MCLR-trapping in diverse soils, and elucidated influencing factors and mechanisms from view of site energy distribution, which shed novel insights on MCLR sorption-desorption by BC-amended soils, and guided to optimize BC-amendment strategy for efficient MCLR-immobilization and eco-risk elimination in diverse soils.
机译：本研究通过各种土壤探索了对微囊藻（MCLR）浓度依赖性吸附和连续解吸（SDE）的生物炭（BC）修正案，以评估BC修正的土壤的MCLR诱捕。土壤性质随着BC剂量和老化时间而变化。随着老化的前进，BC修正的土壤分享了一般相似的“首次增加”，然后减少了MCLR吸附的趋势，并在大多数情况下，初步下降并提高了解吸的趋势。它似乎通过BC修正的土壤的MCLR吸附与中渗透性和表面碱性功能最正呈相关。 BC-MENMENTMENS适用于大多数土壤的MCLR诱捕，特别是4％BC，特别是GZ，SY和SX的最大化诱捕比率为86.59％-95.43％，分别为86.59％-95.43％，分别为80.01％-87.20％和78.73％-90.85％通过大部分增加吸附和降低解吸，以50-500 mu g / l mclr。 BC-Memendment最佳匹配的GZ土壤，因为BC修正GZ的MCLR诱捕在同一BC剂量和老化时间超过其他修正的土壤，但在大多数情况下未明显增加HS土壤的MCLR诱捕，除了2％ BC为3个月老化。现场能量分布证明了大多数土壤的最大增强的MCLR诱捕是由于在吸附过程中的吸附亲和力大大提高了吸附性，使得更接近更耐抗解吸的MCLR结合。相反，BC-insementment未加强HS沿着吸附-SDE的吸附亲和力，以损害MCLR诱捕在大多数情况下。本研究验证了3个月，作为合适的BC老化时间，以最大化在不同的土壤中的MCLR诱捕，并阐明了从现场能量分布观察的影响因素和机制，揭示了BC修正土壤的MCLR吸附解吸的新洞察力，并引导优化在各种土壤中有效的MCLR-固定化和生态风险消除的BC-Mumentment策略。

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  • 来源
    《Environmental Pollution》 |2021年第10期|117364.1-117364.10|共10页
  • 作者

    Yuan Yue; Li Jieming; Wang Chengyu; An Guangqi;

  • 作者单位

    China Agr Univ Coll Resources & Environm Sci Beijing 100193 Peoples R China|China Agr Univ Beijing Key Lab Biodivers & Organ Farming Beijing 100193 Peoples R China;

    China Agr Univ Coll Resources & Environm Sci Beijing 100193 Peoples R China|China Agr Univ Beijing Key Lab Biodivers & Organ Farming Beijing 100193 Peoples R China;

    China Agr Univ Coll Resources & Environm Sci Beijing 100193 Peoples R China|China Agr Univ Beijing Key Lab Biodivers & Organ Farming Beijing 100193 Peoples R China;

    China Agr Univ Coll Resources & Environm Sci Beijing 100193 Peoples R China|China Agr Univ Beijing Key Lab Biodivers & Organ Farming Beijing 100193 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

    Aging time; Biochar-amended soil; Microcystin-LR sorption; Sequential desorption; Site energy distribution;

    机译：老化时间;生物炭修正的土壤;微囊藻 - LR吸附;连续解吸;网站能量分布;

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