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生物炭衍生溶解有机物的释放特性及其对Cr的影响 (vi) 吸附和减少

Hui Liu¹, Ying Wang¹, Shixu Wang¹

¹School of Energy and Environment, Anhui University of Technology Maanshan City 243002 China yulai_wang@163.com.

|December 3, 2024

概括

生物炭衍生溶解有机物 (BDOM) 在酸性土壤中显著影响 (VI) 修复. 水热碳化衍生BDOM增强了Cr(VI) 的吸附和减少,与热解衍生BDOM不同.

科学领域:

环境科学环境科学
土壤化学土壤化学
材料科学材料科学材料科学

背景情况:

生物炭是重金属稳定的主要土壤修改剂.
生物炭衍生溶解有机物 (BDOM) 在污染物修复中的作用经常被忽视.
了解BDOM的影响对于有效的土壤整治战略至关重要.

研究的目的:

研究通过水热碳化 (HC),热解 (PC) 和水解/热解 (HPC) 产生的花园废弃物生物炭的BDOM出.
探索BDOM对 (VI) [Cr (VI) ]在极其酸性环境中的行为的影响.
阐明 BDOM 与 Cr (VI) 和生物炭表面相互作用的机制.

主要方法:

系统地调查使用第一阶动力学模型的BDOM漏动态.
关于 BDOM 分数 (Ar-P,SMP,Ha-L) 的表征.
在存在或缺少BDOM的情况下,对生物炭的Cr (VI) 吸附和减少的评估.

主要成果:

HC的BDOM水量明显高于PC和HPC.
通过预复合,BDOM的存在加快了Cr (VI) 对生物炭的吸附率.
HC-BDOM充当了电子捐赠者,促进了Cr (VI) 的减少,而PC和HPC-BDOM在Fe (II) 氧化方面与Cr (VI) 竞争,降低了其减少率.

结论:

园林废弃物生物炭显示出修复Cr污染土地的巨大潜力.
BDOM,特别是来自HC,在增强土壤有机物质,稳定重金属和通过氧化还原反应排毒Cr (VI) 中发挥着至关重要的作用.
具体的BDOM类型会影响整治机制和效率.

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