Influence of fulvic acid on the colloidal stability and reactivity of nanoscale zero-valent iron

Environmental Pollution
Haoran DongYalan Zeng

Abstract

This study investigated the effect of fulvic acid (FA) on the colloidal stability and reactivity of nano zero-valent iron (nZVI) at pH 5, 7 and 9. The sedimentation behavior of nZVI differed at different pH. A biphasic model was used to describe the two time-dependent settling processes (i.e., a rapid settling followed by a slower settling) and the settling rates were calculated. Generally, the settling of nZVI was more significant at the point of zero charge (pHpzc), which could be varied in the presence of FA due to the adsorption of FA on the nZVI surface. More FA was adsorbed on the nZVI surface at pH 5-7 than pH 9, resulting in the varying sedimentation behavior of nZVI via influencing the electrostatic repulsion among particles. Moreover, it was found that there was a tradeoff between the stabilization and the reactivity of nZVI as affected by the presence of FA. When FA concentration was at a low level, the adsorption of FA on the nZVI surface could enhance the particle stabilization, and thus facilitating the Cr(VI) reduction by providing more available surface sites. However, when the FA concentrations were too high to occupy the active surface sites of nZVI, the Cr(VI) reduction could be decreased even though the FA e...Continue Reading

References

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Citations

Feb 13, 2019·Environmental Science and Pollution Research International·Yunqiang YiPokeung Eric Tsang
Nov 16, 2019·Water Environment Research : a Research Publication of the Water Environment Federation·Zhi-Guo ZhangYang Li
Dec 14, 2019·Environmental Science and Pollution Research International·Yanan WuGuangming Zeng
May 12, 2018·Environmental Science and Pollution Research International·Kassim O BadmusLeslie Petrik
Nov 16, 2020·The Science of the Total Environment·Abdallah ShanablehMohammad Semreen
Jun 13, 2018·Environmental Science & Technology·Songlin WuMichael Komárek

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