在来自城市污水污泥的生物炭上吸附和多基基物质
Alexis Meservey1, Indrek Külaots1, J Daniel Bryant2
1School of Engineering, Brown University, Providence, RI, 02912, United States.
Chemosphere
|September 15, 2024
概括
研究人员从污水污泥中开发了一种可持续的生物炭,以从水中去除有害的PFAS化学物质. 这种具有成本效益的方法通过利用废物改善了水处理,为PFAS污染提供了一个循环经济解决方案.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 和多醇基物质 (PFAS) 是饮用水和废水中发现的持久性环境污染物.
- 传统的吸附剂,如颗粒活性炭 (GAC) 和离子交换树脂 (IXR) 是有效的,但昂贵.
- 需要为PFAS清除提供经济和可持续的替代方案.
研究的目的:
- 创建一个经济可行和可持续的吸收剂,用于从水中去除PFAS.
- 用污水污泥作为吸附材料的前体.
- 研究来自污水污泥的生物炭的特性和PFAS吸附能力.
主要方法:
- 污水污泥在300°C至1000°C的温度下进行阶段性热解,以产生生物炭.
- 结果的生物炭的特定表面积 (SSA) 和多孔性被描述.
- 用 perfluorooctane sulfonic acid (PFOS) 和八种 PFAS 的混合物进行吸附实验,以评估去除效率.
主要成果:
- 热解温度显著影响了生物炭的特性,将SSA增加到148 m2/g,并在1000°C时将孔径增加到0.193 cm3/g.
- 随着热解温度的增加,PFOS吸附能力增加,与较高的SSA和多孔度正相关.
- 生物炭表现出更长链PFAS和具有硫酸头组的PFAS的优先吸附,这表明了疏水性相互作用和中的可用性.
结论:
- 污水污泥衍生生物炭是一种具有成本效益和可持续的吸附剂,用于从水中去除PFOS和混合PFAS.
- 生物炭的特性,如SSA和多孔性,可以通过热解温度调整,从而提高吸附性能.
- 用污水污泥生产生物炭为循环经济带来了好处,并为水处理减少废物的潜力.
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