通过研究纳米TiO2对溶液中磷酸盐的吸附,以及磷酸盐、腐殖酸(HA)浓度、pH值对纳米TiO2团聚性能的影响,探究HA和磷酸盐的协同作用对纳米TiO2颗粒在石英砂柱中迁移行为的影响。结果表明:酸性条件下(pH=6.0)纳米TiO2颗粒对磷酸盐的吸附能力大于碱性条件(pH=8.0),从而导致纳米颗粒更容易聚沉;HA可以抑制纳米TiO2颗粒团聚从而促进其在磷酸盐溶液中的迁移,但HA浓度对其迁移性影响不大。
We studied the adsorption of phosphate(P) on nanoparticles titanium dioxides(n TiO2). In particular,we investigated the effects of P, different concentration of humic acid(HA), and pH on the aggregation of n TiO2 to clarify the interactions between HA and P on the transport of n TiO2 in quartz sand columns. Experimental results show that the adsorption capacity of n TiO2 to P is stronger at pH=6.0 than that at pH=8.0, which indicates that the low pH promotes the aggregation of nanoparticles. The presence of HA inhibits the deposition of n TiO2 resulting in the high transportability in P solution. Moreover, the increase of HA has negligible effect on the transport of n TiO2 in the presence of P.