南京大学学报(自然科学版) ›› 2021, Vol. 57 ›› Issue (3): 409416.doi: 10.13232/j.cnki.jnju.2021.03.008
Zhidong Yang, Ran Luo, Hongxia Xu(), Jichun Wu
摘要:
以生物炭为代表的人工碳材料广泛应用于环境污染的控制和修复,而其中产生的纳米级颗粒可能会迁移或携带污染物共迁移进入地下水环境而加剧污染风险.通过室内一维砂柱实验,研究离子强度(ionic strength,IS)、pH、流速和共存有机污染物(对乙酰氨基酚(acetaminophen,AP))对生物炭纳米颗粒在饱和多孔介质中运移和滞留行为的影响程度和机理.结果表明,纳米级生物炭颗粒在饱和多孔介质中的运移能力较强.生物炭和石英砂的电负性均随着IS的降低、pH的增加而增强,两者之间的静电斥力作用随之增大,造成生物炭在砂粒表面的附着减少从而促进了运移,降低了生物炭在饱和砂柱中的滞留量.流速的增加同样对生物炭的运移具有促进作用,这主要是由增强的水流剪切作用所致.此外,有机污染物AP的存在对生物炭颗粒的运移性具有抑制作用,其在石英砂介质中的滞留量随AP浓度的升高而增大.
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