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In acidic porous medium under the action of humic acid, riceTio2.Migration and retention mechanisms

Bingkun Wang, Yaotian Yu

Abstract

Mechanisms. mobility, retention. titanium dioxide nanoparticles (ntio₂). Well-defined Porous MediaComposite of clean quartz sand in the presence of full acid (FA) and humic acid (HA) were studied under acidic conditions. ntio_2.Were immobile in the Poland media in the absence of FA and HA at pH 4.0. FA and ha could be absorbed into the surface of ntio_2., Change the electrochemical properties of ntio_2.The transport of ntio_2.. The elution of ntio_2.Increased from 0.01 and 0.94 to 0.91 and 0.88 with the increase of FA and ha from 1 mg/L to 10 mg/L specially. Compared to FA, more ha was absorbed onto ntio_2., And us the affected Effect of ha on transport of ntio_2.Was stronger. ions inhibited the mobility of ntio_2., And the effect of CaCl_2.Was greater than that of NaCl in same concentration. The mobility of ntio_2.Was better in the presence of HA than FA. In addition, 7% ~ 56% ntio_2.Was preserved 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 have changed. High Energy barriers between ntio_2.And quartz promoted the mobility of ntio_2., While a combination of the secondary minimum energy, strain, diffusion and gratational position were involved in the retention of ntio_2..

Keywords

Titanium Oxide Nanoparticles;Fulvic Acid;Humic Acid;Stability;Transport

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References

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DOI: https://doi.org/10.18686/pes.v1i1.1226

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