College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, 210098, China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA.
Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA.
J Hazard Mater. 2017 Jun 5;331:28-35. doi: 10.1016/j.jhazmat.2017.02.014. Epub 2017 Feb 14.
Laboratory batch sorption and sand column experiments were conducted to examine the effects of temperature (6 and 24°C) on the retention and transport of GO in water-saturated porous media with different combination of solution ionic strength (IS, 1 and 10mM), sand type (natural and acid-cleaned), and grain size (coarse and fine). Although results from batch sorption experiment showed that temperature affected the sorption of GO onto the sand grains at the low IS, the interactions between GO and the sand were relatively weak, which did make the temperature effect prominent. When the IS was 1mM, experimental temperature showed little effect on GO retention and transport regardless of the medium properties. GO was highly mobile in the sand columns with mass recovery rates ranged from 77.3% to 92.4%. When the IS increased to 10mM, temperature showed notable effects on GO retention and transport in saturated porous media. For all the combinations of sand type and grain size, the higher the temperature was, the less mobile GO particles were. The effects of temperature on GO retention and transport in saturated porous media were further verified though simulations from an advection-dispersion-reaction model.
实验室批式吸附和砂柱实验研究了温度（6 和 24°C）对不同离子强度（IS，1 和 10mM）、砂类型（天然和酸洗）和粒径（粗砂和细砂）组合下饱和多孔介质中 GO 保留和迁移的影响。尽管批式吸附实验结果表明，在低 IS 下，温度会影响 GO 在砂粒上的吸附，但 GO 与砂之间的相互作用较弱，这使得温度效应显著。当 IS 为 1mM 时，实验温度对 GO 的保留和迁移几乎没有影响，无论介质性质如何。GO 在质量回收率范围为 77.3%至 92.4%的砂柱中具有高迁移性。当 IS 增加到 10mM 时，温度对饱和多孔介质中 GO 的保留和迁移有显著影响。对于所有砂类型和粒径的组合，温度越高，GO 颗粒的迁移性越低。通过对流-弥散-反应模型的模拟进一步验证了温度对饱和多孔介质中 GO 保留和迁移的影响。
