Oxidative ageing induces change in the functionality of biochar and hydrochar: Mechanistic insights from sorption of atrazine.
Oxidative ageing induces change in the functionality of biochar and hydrochar: Mechanistic insights from sorption of atrazine.
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DOI：
10.1016/j.envpol.2019.03.035
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发表时间：
2019-06
影响因子：
8.9
通讯作者：
Yuyan Liu;S. Sohi;Fanqi Jing;Jiawei Chen
中科院分区：
文献类型：
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作者：
Yuyan Liu;S. Sohi;Fanqi Jing;Jiawei Chen
在土壤中使用水热炭（HC）和生物炭（BC）的一个吸引力是它们对有机污染物的固有亲和力。氧化老化可能会引起物理化学性质和功能的变化。为了探索玉米秸秆HC和BC吸附有机污染物的长期潜在轨迹，我们采用HC和BC暴露在5%H2O2中模拟氧化老化，并深入了解阿特拉津在新鲜和人工老化材料上的吸附机制。采用元素分析、SSA、FTIR、XPS和SEM-EDS对新鲜和老化材料的物理化学性质进行了系统的比较，同时采用K2 Cr2 O 7/H2SO 4处理来评估化学氧化稳定性。阿特拉津是一种典型的除草剂和疏水性有机污染物。阿特拉津的吸附等温线被用来揭示BC和HC的吸附机制的差异，通过评估前和老化。在650 °C下新鲜产生的BC比在500 °C下产生的BC表现出更高的阿特拉津吸附能力，其中π-π EDA相互作用占主导地位。在250 °C下新鲜产生的HC的吸附能力高于在200 °C HC下产生的HC，这是由于较高的C含量和阿特拉津分配到有机相中。老化增加了BC和HC的含氧官能团的表面丰度，并减少了体积芳香性。老化后，高温BC对阿特拉津的吸附量降低，而HC对阿特拉津的吸附量增加。在制定通过向土地添加可再生材料来共同管理污染物和碳的战略时，必须考虑到这种不同的影响。
One attraction of using hydrochar (HC) and biochar (BC) in soil is their intrinsic affinity for organic contaminants. Oxidative ageing is likely to induce changes in physicochemical properties and functionality. To explore the long-term potential trajectories for corn stalk HC and BC to adsorb organic pollutants, we employed HC and BC exposure in 5% H2O2to simulate oxidative ageing and get insights into mechanisms of atrazine adsorption on fresh and artificially aged materials. The physicochemical properties of fresh and aged materials were systematically compared using elemental analysis, SSA, FTIR, XPS and SEM-EDS, alongside K2Cr2O7/H2SO4treatment to assess chemical oxidation stability. Atrazine is a typical herbicide chemical and hydrophobic organic pollutant. Adsorption isotherms of atrazine were used to reveal differences in mechanisms of sorption to BC and HC, by assessment before and ageing. BC freshly produced at 650 °C displayed higher capacity for atrazine sorption than BC produced at 500 °C, with a dominant role for π-π EDA interactions. The sorption capacity of HC freshly produced at 250 °C was higher than for HC produced at 200 °C HC, owing to higher C content and atrazine partitioning into the organic phase. Ageing increased the surface abundance of oxygenated functional groups for BC and HC and diminished bulk aromaticity. After ageing, atrazine sorption by high temperature BC was lower, but for HC it was increased. Such divergent effects must be considered when developing strategies to co-manage contaminants and carbon through the addition of carbonized materials to land.