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- W2000700088 abstract "The surfaces of nano-hydroxyapatite (nHAP) used for contaminated soil and groundwater remediation may be modified to render nHAP highly mobile in the subsurface. Humic acid (HA) is widely used to modify and stabilize colloid suspensions. In this work, column experiments were conducted to determine the effects of contaminant (e.g., Cu) concentration, ionic strength (IS), and ion composition (IC) on the transport behavior of HA-modified nHAP in saturated packed columns. IS and nature of the cation had strong effects on the deposition of nHAP, and the effect was greater for divalent than for monovalent cations. Divalent cations have a greater capacity to screen the surface charge of nHAP, and Ca2+ bridges the HA-modified nHAP colloidal particles, which causes greater deposition. Moreover, Cu2+ had a greater effect on the transport behavior than Ca2+ due to their strong exchange with Ca2+ of nHAP and its surface complexation with nHAP. The relative travel distance LT, of the injected HA-modified nHAP colloids, ranges from less than one to several meters at varying Cu concentrations, ISs, and ICs in saturated packed columns. The results are crucial to evaluate the efficacy of nHAP on the remediation of contaminated soil and groundwater environments." @default.
- W2000700088 created "2016-06-24" @default.
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- W2000700088 date "2011-08-01" @default.
- W2000700088 modified "2023-10-18" @default.
- W2000700088 title "Transport behavior of humic acid-modified nano-hydroxyapatite in saturated packed column: Effects of Cu, ionic strength, and ionic composition" @default.
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- W2000700088 doi "https://doi.org/10.1016/j.jcis.2011.04.064" @default.
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