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同位素分离在通过木基生物炭去除六价时

Filip Budimir¹, Carol J Ptacek¹, Richard T Amos²

¹Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2N 3G1, Canada.

|December 4, 2024

概括

基于木的生物炭有效地从水中去除了99%的有毒六价 (Cr(VI)). 这种可持续的修复方法利用生物炭.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
化学化学化学

背景情况:

六价 (Cr(VI)) 是一种致癌重金属污染物.
从生物质热解中获得的生物炭显示出可持续环境修复的潜力.
生物炭的多孔结构和功能组增强了其金属吸附能力.

研究的目的:

评估基于木的生物炭在从水溶液中去除Cr (VI) 的有效性.
通过生物炭去除Cr (VI) 的机制.
探索稳定同位素作为生物炭-Cr相互作用指标的实用性.

主要方法:

使用木基生物炭和Cr6溶液的批量实验.
分析Cr(VI) 清除效率和能力.
使用富里埃变换红外光谱 (FTIR) 和X射线光电子光谱 (XPS) 进行了表征.
基于同步离子的X射线吸收近边结构 (XANES) 谱学.
稳定同位素 (δ53Cr) 的分析.

主要成果:

树基生物炭在100小时内实现了99%的Cr(VI) 去除,容量超过5毫克g-1.1.
FTIR和XPS表明,亚利法和碳基参与了Cr6的去除.
XPS和XANES证实了生物炭上存在Cr (III) 和Cr (VI) 的存在,这表明了降解和吸附.
Cr同位素分析显示了Cr(VI) 减少,在雷利分离曲线之后,e53Cr为-1.33‰.

结论:

基于树的生物炭是用于Cr (VI) 修复的高效吸附剂.
的去除涉及表面复杂化和减少过程.
稳定的同位素作为可靠的标记物用于监测生物炭-Cr反应.

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