Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.
Water Res. 2011 Nov 15;45(18):5905-15. doi: 10.1016/j.watres.2011.08.041. Epub 2011 Sep 16.
Column experiments were conducted to investigate the facilitated transport of Cu in association with hydroxyapatite nanoparticles (nHAP) in water-saturated quartz sand at different solution concentrations of NaCl (0-100 mM) or CaCl(2) (0.1-1.0 mM). The experimental breakthrough curves and retention profiles of nHAP were well described using a mathematical model that accounted for two kinetic retention sites. The retention coefficients for both sites increased with the ionic strength (IS) of a particular salt. However, the amount of nHAP retention was more sensitive to increases in the concentration of divalent Ca(2+) than monovalent Na(+). The effluent concentration of Cu that was associated with nHAP decreased significantly from 2.62 to 0.17 mg L(-1) when NaCl increased from 0 to 100 mM, and from 1.58 to 0.16 mg L(-1) when CaCl(2) increased from 0.1 to 1.0 mM. These trends were due to enhanced retention of nHAP with changes in IS and ionic composition (IC) due to compression of the double layer thickness and reduction of the magnitude of the zeta potentials. Results indicate that the IS and IC had a strong influence on the co-transport behavior of contaminants with nHAP nanoparticles.
采用柱实验研究了在不同 NaCl（0-100mM）或 CaCl2（0.1-1.0mM）溶液浓度下，羟磷灰石纳米颗粒（nHAP）与 Cu 的水饱和石英砂中的促进传递。使用考虑两个动力学保留位点的数学模型很好地描述了 nHAP 的实验突破曲线和保留分布。两个位点的保留系数均随特定盐的离子强度（IS）增加而增加。然而，nHAP 的保留量对二价 Ca2+浓度的增加比对一价 Na+的增加更为敏感。当 NaCl 从 0 增加到 100mM 时，与 nHAP 相关的 Cu 的流出浓度从 2.62 显著降低到 0.17mg/L，当 CaCl2 从 0.1 增加到 1.0mM 时，从 1.58 降低到 0.16mg/L。这些趋势是由于双电层厚度压缩和 zeta 电位幅度减小导致 IS 和离子组成（IC）变化，从而增强了 nHAP 的保留。结果表明，IS 和 IC 对污染物与 nHAP 纳米颗粒的共迁移行为有很强的影响。
