纳米银与微塑料在模拟垃圾填埋柱中的共迁移特征

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Abstract Lab-scaled simulated landfill columns and synthetic leachate were prepared to investigate the transport of silver nanoparticles (AgNPs) and microplastics (MPs) in municipal solid waste landfill. The results showed that stability of AgNPs and MPs in leachate increased with the landfill time extending while they existed in a single system as well as in a binary system. Thus the migration ability of these pollutants in the landfill was promoted so that more pollutant particles could be discharged from the middle and aged landfill along with leachate. In comparison with single system, AgNPs and MPs coexisting system facilitated the transport of AgNPs but slightly inhibited the transport of MPs. In term of DLVO theory and colloidal filtration theory, it suggests that MPs of higher mobility could serve as carriers of AgNPs and compete with AgNPs for adsorption sites on the solid media, thereby promoting the transport of AgNPs. Inversely, the coexisting AgNPs could reduce the negative surface charge on the MPs to weaken the stability of pollutants particle, and could provide additional deposit sites for MPs through AgNPs pre-deposition on the solid media, thereby inhibiting the transport of MPs.

Key words： microplastic silver nanoparticles landfill aggregation DLVO theory pollution characteristics

Received: 07 January 2022

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X145

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	Articles by authors
	HE Chang
	ZENG Xiao-lan
	ZHANG Cun-kuan
	XU Xiao-tang
	DING Wen-chuan

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HE Chang,ZENG Xiao-lan,ZHANG Cun-kuan等. Characteristics of silver nanoparticles and microplastics co-migration in simulated landfill columns[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3788-3795.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I8/3788

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