Deposition mechanism of polydisperse xanthan gum-stabilized graphene oxide/nano-iron composites in saturated porous medium
Deposition mechanism of polydisperse xanthan gum-stabilized graphene oxide/nano-iron composites in saturated porous medium
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多分散黄原胶稳定氧化石墨烯/纳米铁复合材料在饱和多孔介质中的沉积机理
DOI：
10.1016/j.jclepro.2020.123069
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发表时间：
2020-07
影响因子：
11.1
通讯作者：
Chunpeng Zhang
中科院分区：
文献类型：
--
作者：
Liming Ren;Zifang Chi;Jun Dong;Yongsheng Zhao;Chunpeng Zhang
工程材料（EM）已显示出修复地下水污染物的前景，潜在的应用依赖于将EM的水溶液输送到目标地下位置或区域。因此，准确预测纳米颗粒在饱和多孔介质中的传输和保留的能力是设计和评估潜在的场规模环境应用所面临的最大技术挑战之一。在此基础上，通过耦合Derjaguin-Landau-Verwey-Overbeek（DLVO）相互作用、布朗扩散、流体动力学和截留效应，建立了一个先验预测模型。模型中使用的特征包括介质尺寸、孔隙率、注射速度、颗粒尺寸分布、附着效率、单集电器接触效率。为深入了解多分散黄原胶稳定氧化石墨烯/纳米铁复合材料（XG-nZVI/rGO）的沉积机理，提出了将参数化先验模型预测值与实验测量值进行直接比较的方法。该模型预测的沉积速率系数定量非常接近测量速率。当XG-nZVI/rGO的颗粒直径（dp）大于1.2080 μm时，它被截留在多孔介质中，当dp < 0.1737 μm时，如果它所具有的动能（Ek）小于二次能极小值的深度，XG-nZVI/rGO就会沉积在多孔介质中;当0.1737 μm <dp< 1.2080 μm时，颗粒在附着力矩（TA）大于流体阻力矩（TH）处发生沉积。在0.34-1.70 g/L范围内，沉积速率与注入浓度呈正相关。此外，低沉积速率观察到约0.69厘米/分钟的注射速度。
Engineered materials (EMs) have shown promise for remediation of groundwater contaminants and the potential application relies on the delivery of aqueous solutions of EMs to a targeted subsurface location or region. Thus, the ability to accurately predict nanoparticle transport and retention in saturated porous media is one of the most technical challenges faced by the design and assessment of potential field-scale environmental applications. Here, a prior prediction model was presented by coupling the effect of Derjaguin–Landau–Verwey–Overbeek (DLVO) interaction, Brownian diffusion, hydrodynamics and interception. Characteristics used in the model were medium size, porosity, injection velocity, size distribution of particles, attachment efficiency, single-collector contact efficiency. The direct comparison of parameterized prior model predictions to experimental measurements was proposed to thoroughly understand deposition mechanism of polydisperse xanthan gum-stabilized graphene oxide/nano-iron composites (XG-nZVI/rGO). The model predicted deposition rate coefficient quantitatively very close to measured rates. When the particle diameter (dp) of XG-nZVI/rGO excessed 1.2080 μm, it was retained in the porous medium by interception; Whendp< 0.1737 μm, XG-nZVI/rGO would deposite in the porous medium if the kinetic energy (Ek) it possessed is less than the depth of the secondary energy minimum; When 0.1737 μm <dp< 1.2080 μm, deposition occurred where adhesive torques (TA) was in excess of hydrodynamic drag torgues (TH) particles subject to. Further, deposition rate was positive correlated with injection concentrations among the range of 0.34–1.70 g/L. Besides, low deposition rates were observed with injection velocities around 0.69 cm/min.
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影响因子：
5.4
作者：
L. Landkamer;R. Harvey;Timothy Scheibe;J. Ryan
通讯作者：
L. Landkamer;R. Harvey;Timothy Scheibe;J. Ryan
影响因子：
11.4
作者：
Xu, Shangping;Liao, Qian;Saiers, James E.
通讯作者：
Saiers, James E.
DOI：
10.1016/0956-9618(94)80024-3
发表时间：
1994-10-01
期刊：
SEPARATIONS TECHNOLOGY
影响因子：
--
作者：
ELIMELECH, M
通讯作者：
ELIMELECH, M
影响因子：
11.4
作者：
Shen, Chongyang;Li, Baoguo;Jin, Yan
通讯作者：
Jin, Yan
影响因子：
11.4
作者：
Dalla Vecchia, Elena;Luna, Michela;Sethi, Rajandrea
通讯作者：
Sethi, Rajandrea