Influence of flow rate on the transport of nTiO2 and phosphate and its modeling

Gang Feng; Gang Feng; Nan Xu; Zuling Li; Zuling Li; Yuhe Cao; Yuhe Cao; Keqing Sun; Keqing Sun

doi:10.24294/can.v4i1.1328

Influence of flow rate on the transport of nTiO2 and phosphate and its modeling

Gang Feng, Gang Feng, Nan Xu, Zuling Li, Zuling Li, Yuhe Cao, Yuhe Cao, Keqing Sun, Keqing Sun

Article ID: 1328
Vol 4, Issue 1, 2021

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Abstract

We studied Zeta potentials of nanoparticles titanium dioxides （nTiO2） in different concentration of NaNO3 and phosphate (P) solutions. In addition, the effect of flow rate on the transport of nTiO₂in P was investigated at pH＝6.5. Experimental results show that the Zeta potential of nTiO₂is compressed with the increasing ion concentration (IC) of NaNO3 at pH＝6.5. The negative charge increases with the augment of P. Therefore, the high P and low NaNO3 induce the stabilization of nTiO₂aggregates. The transport experiments suggest that the rapid flow rate is favorable for the transportability of nTiO₂and soluble phosphate. The breakthrough transport curves (BTCs) of nTiO₂in sand columns can be fitted well with two-site kinetic attachment model. The modeling results suggest that the values of first-order attachment rate coefficients (k₂) and detachment rate coefficients (k_2d) on site 2 and first-order attachment rate coefficients (k₁) on site 1 are responsible to the attaching efficiency of nTiO₂on sands and their transportability.

Keywords

nTiO2; Zeta Potential; Transport; Phosphate

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DOI: https://doi.org/10.24294/can.v4i1.1328