背景离子类型和浓度对聚苯乙烯微塑料/铅在饱和石英砂中共运移的影响

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Abstract In order to elucidate the effect of hydrochemical conditions on the transport of microplastics and heavy metals, and to clarify the coupling effect in the co-transport process of the two environmental pollutants and their response mechanism to environmental conditions preliminarily, the effects of background electrolyte ions with different valence and concentrations on the individual and co-transport behaviors of 1μm polystyrene microplastics (PS-MPs) and Pb²⁺ in a saturated one-dimensional sand column were studied. The experimental results showed that the increase in the background ion concentration or the valence would inhibit the individual transport ability of PS-MPs. When the Na⁺ concentration increased from 1mmol/L to 100mmol/L, the repulsive barrier between PS-MPs and quartz sand decreased by 1348kT; when the Ca²⁺ concentration increased from 1mmol/L to 100mmol/L, the repulsive barrier between PS-MPs and quartz sand decreased by 956kT. Pb²⁺ in PS-MPs/Pb²⁺ binary system could reduce the transport ability of PS-MPs, and the increase of the background ion concentration and the valence can weaken the inhibition of Pb²⁺ on the transport ability of PS-MPs. When the Na⁺ concentration increased from 1mmol/L to 100mmol/L, the repulsive barrier between PS-MPs and quartz sand decreased by 1100kT; when the Ca²⁺ concentration increased from 1mmol/L to 100mmol/L, the repulsive barrier between PS-MPs and quartz sand decreased by 543kT. The increase in the background ion concentration or the valence can promote the individual transport ability of Pb²⁺. PS-MPs can promote the transport of Pb²⁺ in the binary system of PS-MPs/Pb²⁺. When the background ion concentration was low, the transport of Pb²⁺loaded by PS-MPs was higher, and vice versa. For PS-MPs and Pb²⁺ individual transport systems, the increase in background cation concentration and valence can further shield the negative charges on the surface of PS-MPs and quartz sand, competitive adsorption the surface binding sites of quartz sand, inhibits the transport of PS-MPs while promoting Pb²⁺ transport. For the co-transport system of PS-MPs and Pb²⁺, the increase in background ion concentration and valence can weaken the inhibitory effect of Pb²⁺ on the transport ability of PS-MPs by adjusting the interaction between Pb²⁺ and PS-MPs and the surface of quartz sand. The competitive adsorption of background ions to PS-MPs’ surface sites and the shielding effect on charges affect the transport ability of Pb²⁺ loaded by PS-MPs.

Key words： microplastic polystyrene heavy metals lead ion porous media co-transport

Received: 30 December 2021

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X145

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	Articles by authors
	CHANG Bo-kun
	CHEN Yi-ting
	CAO Gang
	HU Liang
	Lü Jia-long
	DU Wei
	HU Fei-nan

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CHANG Bo-kun,CHEN Yi-ting,CAO Gang等. Effects of background ion types and concentrations on the co-transport of polystyrene microplastics / lead in saturated quartz sand[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3193-3203.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3193

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