Deposition of protein-coated multi-walled carbon nanotubes on oxide surfaces and the retention in a silicon micromodel
Deposition of protein-coated multi-walled carbon nanotubes on oxide surfaces and the retention in a silicon micromodel
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蛋白质涂覆的多壁碳纳米管在氧化物表面的沉积及其在硅微模型中的保留
DOI：
10.1016/j.jhazmat.2019.04.077
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发表时间：
2019
影响因子：
13.6
通讯作者：
Jiang Wei
中科院分区：
文献类型：
--
作者：
Song Jian;Wang Qi;Zeng Yuxuan;Liu Yuanyuan;Jiang Wei
采用动态光散射（DLS）、石英晶体微天平（QCM-D）和二维硅微模型分别研究了牛血清白蛋白处理的多壁碳纳米管（BSA-MWCNTs）的聚集、沉积和多孔滞留特性。BSA-MWCNTs的聚集符合Derjaguin-Landau-Verwey-Overbeek（DLVO）理论。临界凝聚浓度（CCC）分别为175 mMNaCl和2.7mMCaCl_2，表明Ca ~（2+）引起更强的凝聚作用。BSA-MWCNT在SiO2表面上的沉积是不利的，临界沉积浓度（CDC）为100 mMin NaCl和0.9 mMin CaCl 2。在Al 2 O3表面上的沉积是有利的。沉积速率在低离子强度（IS）下由静电力主导，但当IS高于CDC时，静电相互作用被消除。因此，在SiO2或Al 2 O3表面上的沉积速率在CDC点处由于减少的颗粒扩散而开始降低。在微观模型中，可以通过显微镜观察到BSA-MWCNTs在孔隙中的附着量和位置。固位附着效率在较高的IS下增加。悬浮的BSA-MWCNTs通过扩散或拦截接近收集器。附着的BSA-MWCNTs使孔隙变窄，然后堵塞孔喉。过滤过程发生在堵塞的孔喉上。
The aggregation, deposition and porous retention of bovine serum albumin treated multi-walled carbon nanotubes (BSA-MWCNTs) are investigated using dynamic light scattering (DLS), quartz crystal microbalance with dissipation (QCM-D) and 2-dimensional silicon micromodel, respectively. The aggregation of BSA-MWCNTs is consistent with Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The critical coagulation concentration (CCC) is 175 mMNaCl and 2.7 mMCaCl2, suggesting that Ca2+causes stronger aggregation. The BSA-MWCNT deposition on SiO2surface is unfavorable with critical deposition concentration (CDC) of 100 mMin NaCl and 0.9 mMin CaCl2. The deposition on the Al2O3surface is favorable. Deposition rate is dominated by electrostatic forces at low ionic strength (IS), but electrostatic interaction is eliminated when IS is above CDC. Therefore the deposition rate on SiO2or Al2O3surface starts decreasing at the CDC point due to the reduced particle diffusion. In micromodel, the amount and position of attached BSA-MWCNTs in pore space can be observed by a microscope. The retention attachment efficiency increases at higher IS. The suspended BSA-MWCNTs approach to the collector through either diffusion or interception. The attached BSA-MWCNTs narrow the pore space and then clog the pore throats. The straining process happens on the clogged pore throats.