腐殖酸作用下酸性多孔介质中纳米TiO<sub>2</sub>的迁移与滞留机制

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Abstract

The mechanisms of mobility and retention of titanium dioxide nanoparticles (nTiO₂) in well-defined porous media composed of clean quartz sand in the presence of fulvic acid (FA) and humic acid (HA) were studied under acidic conditions. nTiO₂ were immobile in the porous media in the absence of FA and HA at pH 4.0. FA and HA could be adsorbed onto the surface of nTiO₂, change the electrokinetic properties of nTiO₂, and facilitate the transport of nTiO₂. The elution of nTiO₂ increased from 0.01 and 0.88 to 0.91 and 0.94 with the increase of FA and HA from 1mg/L to 10mg/L respectively. Compared to FA, more HA was adsorbed onto nTiO₂, and thus the facilitated effect of HA on transport of nTiO₂ was stronger. Ions inhibited the mobility of nTiO₂, and the effect of CaCl₂ was greater than that of NaCl in same concentration. The mobility of nTiO₂ was better in the presence of HA than FA. In addition, 7%~56% nTiO₂ was deposited in the secondary energy minimum well in the presence of HA, higher than 4%~17% in the presence of FA, which could be easily released when the environmental conditions changed. High energy barriers between nTiO₂ and quartz promoted the mobility of nTiO₂, while a combination of the secondary minimum energy, straining, diffusion and gravitational deposition were involved in the retention of nTiO₂.

Key words： titanium dioxide nanoparticles fulvic acid humic acid stability transport

Received: 02 February 2018

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	ZHANG Rui-chang
	ZHANG Hai-bo
	TU Chen
	LUO Yong-ming

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ZHANG Rui-chang,ZHANG Hai-bo,TU Chen等. Mechanisms of mobility and retention of nano-TiO₂ in acidic porous media in the presence of humus acids[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3542-3551.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I9/3542

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