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使用聚碳酸 (BPCA) 方法评估活性生物炭及其PFAS吸附能力

Aleksandar I Goranov¹, Erlend Sørmo², Nikolas Hagemann³

¹Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA, USA.

|March 24, 2024

概括

用蒸汽激活的生物炭显示出优异的凝结芳香碳 (ConAC) 含量,增强它们从污染的土壤中去除和多基物质 (PFAS) 的能力. 这项研究强调了蒸汽激活是生产高性能生物碳吸附剂的有效方法.

科学领域:

环境化学环境化学
材料科学材料科学材料科学
可持续化学可持续化学

背景情况:

活性炭 (AC) 和活性生物炭 (AB) 对于去除和多基物质 (PFAS) 至关重要.
凝结芳香碳 (ConAC) 是主要的成分,负责污染物吸附在AC和AB.
生物炭激活方法,ConAC形成和PFAS吸附之间的关系仍未得到充分研究.

研究的目的:

为了描述蒸汽激活 (AB-Steam) 和二氧化碳激活 (AB-CO2) 生物炭中的凝缩芳香碳 (ConAC).
调查激活条件对ConAC内容和结构的影响.
为了确定CONAC特性和PFAS在受污染的土壤中的合效率之间的相关性.

主要方法:

从废木材中制备活性生物炭 (AB-蒸汽和AB-CO2),使用不同的温度和蒸汽比率.
量化基聚碳酸 (BPCA) 标记物,以评估ConAC含量和集群大小.
使用AB-Steam去除污染土壤中的PFAS的修复实验和相关性分析.

主要成果:

与CO2激活 (81%) 相比,蒸汽激活产生了更高的ConAC含量 (92%).
在AB-Steam中,由B6CA/B5CA比率表示的较大的ConAC群体显示出来,这表明更有效的ConAC形成.
在ConAC含量和长链PFAS的吸收之间观察到强烈的相关性,而静电排斥影响了短链PFAS的吸收.

结论:

蒸汽激活比CO2激活更有效地产生富含ConAC的生物炭.
ConAC的含量和结构显著影响PFAS吸附机制,对于长链PFAS,疏水性相互作用占主导地位.
BPCA方法是评估生物炭质量和预测PFAS吸附性能的一种有价值的工具,可以有效地改善土壤.

关键词:

活性化生物碳是什么活性炭是一种活性炭.在BPCA方法中,使用BPCA方法.凝结的芳香碳 (ConAC) 是一种在PFAS中,我们可以使用PFAS.吸附机制吸附机制吸附机制

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