Department of Environmental Science, Zhejiang University, Hangzhou 310058, China.
Environ Pollut. 2013 Nov;182:269-77. doi: 10.1016/j.envpol.2013.07.034. Epub 2013 Aug 13.
The effect of different surfactants on the transport of multiwalled carbon nanotubes (MWCNTs) in quartz sand-packed columns was firstly investigated under various conditions. The stable plateau values (C(max)) of the breakthrough curves (BTCs), critical PVs (the number of pore volumes of infusions needed to reach the C(max)), maximum transport distances (L(max)), deposition rate coefficients (kd) and retention rates were calculated to compare the transport and retention of MWCNTs under various conditions. Stability of the MWCNT suspensions as a function of the influencing factors was examined to reveal the underlying mechanism of the MWCNT retention. Results showed that MWCNTs suspended by different surfactants presented different BTCs; the MWCNT transport increased with increasing sand size and MWCNT concentration; high flow velocity was favorable for the MWCNT transport, while high Ca(2+) concentration and low pH were unfavorable for the transport; hetero-aggregation, straining and site blocking occurred during the transport.
首先在各种条件下研究了不同表面活性剂对多壁碳纳米管（MWCNTs）在石英砂填充柱中传输的影响。通过计算穿透曲线（BTC）的稳定平台值（C（max））、临界 PV（达到 C（max）所需的注入孔隙体积数）、最大传输距离（L（max））、沉积速率系数（kd）和保留率，比较了 MWCNTs 在各种条件下的传输和保留情况。考察了 MWCNT 悬浮液对影响因素的稳定性，以揭示 MWCNT 保留的潜在机制。结果表明，不同表面活性剂悬浮的 MWCNTs 呈现出不同的 BTC；MWCNT 的传输随砂粒径和 MWCNT 浓度的增加而增加；高流速有利于 MWCNT 的传输，而高 Ca（2+）浓度和低 pH 值不利于传输；在传输过程中发生了异质聚集、堵塞和位阻。
