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铁铝土对溶解性有机质的吸附特性

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吴东明, 李勤奋, 武春媛. 铁铝土对溶解性有机质的吸附特性[J]. 环境化学, 2016, 35(4): 639-650. doi: 10.7524/j.issn.0254-6108.2016.04.2015112205
引用本文: 吴东明, 李勤奋, 武春媛. 铁铝土对溶解性有机质的吸附特性[J]. 环境化学, 2016, 35(4): 639-650. doi: 10.7524/j.issn.0254-6108.2016.04.2015112205
shu
WU Dongming, LI Qinfen, WU Chunyuan. Adsorption of dissolved organic matter on ferrallitic soils[J]. Environmental Chemistry, 2016, 35(4): 639-650. doi: 10.7524/j.issn.0254-6108.2016.04.2015112205
Citation: WU Dongming, LI Qinfen, WU Chunyuan. Adsorption of dissolved organic matter on ferrallitic soils[J]. Environmental Chemistry, 2016, 35(4): 639-650. doi: 10.7524/j.issn.0254-6108.2016.04.2015112205
shu

铁铝土对溶解性有机质的吸附特性

  • 1.

    海南大学环境与植物保护学院, 海口, 570228;

  • 2.

    中国热带农业科学院环境与植物保护研究所, 海口, 571101;

  • 3.

    农业部儋州农业环境科学观测实验站, 儋州, 571737

  • 基金项目:

    国家自然科学基金(41371465)资助.

Adsorption of dissolved organic matter on ferrallitic soils

  • 1.

    College of Environment and Plant Protection, Hainan University, Haikou, 570228, China;

  • 2.

    Institute of Environment and Plant Protection, Chinese Academy of Tropical Agricultural Sciences, Haikou, 571101, China;

  • 3.

    Danzhou Scientific Observing and Experimental Station of Agro-Environment, Ministry of Agriculture, Danzhou, 571737, China

  • Fund Project: Supported by the National Natural Science Foundation of China(41371465).

  • 摘要: 采用批实验方法,结合XAD树脂分组技术研究铁铝土对3种不同亲/疏性DOM(堆肥DOM、秸秆DOM、土壤DOM)的吸附特征并分析其影响因素.结果表明:(1)铁铝土对DOM具有强吸附力,吸附量随DOM初始浓度的增加而增加,吸附动力学包括快吸附和慢吸附两个阶段,符合一级扩散方程;(2)等温吸附特征符合Freundlich方程,为物理作用主导的多层吸附过程;(3)对于同种DOM,铁铝土对DOM的吸附量表现为暗红湿润铁铝土> 简育铁铝土> 潜育水稻土,对50 mg·L-1的堆肥DOM在暗红湿润铁铝土的吸附量达594.9 mg·kg-1,与CEC、游离氧化铁、游离氧化铝、粘粒呈极显著正相关,与砂粒呈负相关;(4)对于同种铁铝土,高疏水性DOM在铁铝土吸附量更大,表现为堆肥DOM(H-DOM)> 土壤DOM(M-DOM)> 秸秆DOM(L-DOM);(5)铁铝土对DOM各组分的吸附力表现为疏水中性组分(HON)> 酸不溶组分(AIM)> 疏水碱性组分(HOB)> 疏水酸性组分(HOA)> 亲水性组分(HIM),结合各组分的红外光谱特征,推测脂肪链状结构、高芳香性是影响吸附量的关键.(6)DOM各组分对DOM吸附量的贡献是各组分吸附能力与含量的综合作用结果.对于亲疏水性组分,HO对DOM吸附量的贡献大于HIM,达69.43%—85.08%;对于各极性-电荷特性组分,表现为H-DOM:HOA(40.24%)> HON(39.1%)> HIM(14.92%)> AIM(3.82%)> HOB(1.88%);L-DOM:HOA(33.50%)> HIM(30.57%)> HON(24.81%)> AIM(7.45%)> HOB(3.68%).(7)内源DOM对铁铝土吸附外源DOM起抑制作用,且对高疏水性的DOM抑制作用更强.
    Abstract: Batch experiments and XAD resin were used to investigate dissolved organic matter (DOM) adsorption by ferrallitic soils. The effects of soil properties and DOM characteristics on the adsorption were also studied to reveal the adsorption mechanism. The results showed that: (1) ferrallitic soils had high DOM adsorption capacity, which increased with initial DOM concentrations. The kinetics of DOM adsorption in the ferrallitic soils can be divided into the two stages: fast and slow reactions, and it could be better fitted by frist-order model; (2) the adsorption isotherms of DOM on ferrallitic soils could be better fitted by Freundlich equation, indicating the adsorption process was a physical multilayer adsorption process; (3) for different soils, the adsorption capacity of DOM follows the order of rhodic ferralsol > haplic ferralsol > paddy soil, adsorbing capacity of compost DOM was up to 594.9 mg·kg-1 in the initial concentration of 50 mg·L-1, it positively correlated with CEC, free iron oxide, free aluminium oxide and clay content, while negatively correlated with sand content; (4) for different DOMs, more hydrophobic DOM had the larger adsorption capacity, which follows the order of compost DOM (H-DOM) > soil DOM (M-DOM) > straw DOM(L-DOM); (5) for different DOM components, the adsorption capacity decreased as follows: hydrophobic neutrals (HON) > acid-insoluble matter (AIM) > hydrophobic bases (HOB) > hydrophobic acids (HOA) > hydrophillic matter (HIM). And the chain structure of aliphatic alkanes and higher aromaticity in DOM were the key factors influencing adsorption capacity as revealed by Fourier-transform infrared spectroscopy (FT-IR); (6) the contribution to DOM adsorption by different fractions was the result of their adsorption capacity and content. For different hydrophobic DOM, hydrophobic matter's contribution (HO) was more than HIM, up to 69.43%—85.08%. For different polar fractions, H-DOM: HOA(40.24%)> HON(39.1%)> HIM(14.92%)> AIM(3.82%)> HOB(1.88%); L-DOM: HOA(33.50%)> HIM(30.57%)> HON(24.81%)> AIM(7.45%)> HOB(3.68%). (7) the presence of exogenous DOMs in soil impeded the exogenous DOM adsorption by soil, especially for more hydrophobic DOM.
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  • 收稿日期:  2015-11-22
  • 刊出日期:  2016-04-15

铁铝土对溶解性有机质的吸附特性

  • 1.  海南大学环境与植物保护学院, 海口, 570228;
  • 2.  中国热带农业科学院环境与植物保护研究所, 海口, 571101;
  • 3.  农业部儋州农业环境科学观测实验站, 儋州, 571737
  • 收稿日期:  2015-11-22
基金项目:

国家自然科学基金(41371465)资助.

摘要: 采用批实验方法,结合XAD树脂分组技术研究铁铝土对3种不同亲/疏性DOM(堆肥DOM、秸秆DOM、土壤DOM)的吸附特征并分析其影响因素.结果表明:(1)铁铝土对DOM具有强吸附力,吸附量随DOM初始浓度的增加而增加,吸附动力学包括快吸附和慢吸附两个阶段,符合一级扩散方程;(2)等温吸附特征符合Freundlich方程,为物理作用主导的多层吸附过程;(3)对于同种DOM,铁铝土对DOM的吸附量表现为暗红湿润铁铝土> 简育铁铝土> 潜育水稻土,对50 mg·L-1的堆肥DOM在暗红湿润铁铝土的吸附量达594.9 mg·kg-1,与CEC、游离氧化铁、游离氧化铝、粘粒呈极显著正相关,与砂粒呈负相关;(4)对于同种铁铝土,高疏水性DOM在铁铝土吸附量更大,表现为堆肥DOM(H-DOM)> 土壤DOM(M-DOM)> 秸秆DOM(L-DOM);(5)铁铝土对DOM各组分的吸附力表现为疏水中性组分(HON)> 酸不溶组分(AIM)> 疏水碱性组分(HOB)> 疏水酸性组分(HOA)> 亲水性组分(HIM),结合各组分的红外光谱特征,推测脂肪链状结构、高芳香性是影响吸附量的关键.(6)DOM各组分对DOM吸附量的贡献是各组分吸附能力与含量的综合作用结果.对于亲疏水性组分,HO对DOM吸附量的贡献大于HIM,达69.43%—85.08%;对于各极性-电荷特性组分,表现为H-DOM:HOA(40.24%)> HON(39.1%)> HIM(14.92%)> AIM(3.82%)> HOB(1.88%);L-DOM:HOA(33.50%)> HIM(30.57%)> HON(24.81%)> AIM(7.45%)> HOB(3.68%).(7)内源DOM对铁铝土吸附外源DOM起抑制作用,且对高疏水性的DOM抑制作用更强.

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