Department of Civil and Materials Engineering, Hydromechanics and Water Resources Engineering Laboratory, University of Illinois at Chicago, 842 W. Taylor St., Chicago, IL 60607, USA.
Environ Pollut. 2013 Mar;174:106-13. doi: 10.1016/j.envpol.2012.11.002. Epub 2012 Dec 17.
The aggregation, transport and deposition kinetics (i.e. attachment and release) of TiO(2) nanoparticles (nano-TiO(2)) were investigated as a function of ionic strength and the presence of anionic (sodium dodecylbenzene sulfonate, SDBS) and non-ionic (Triton X-100) surfactants in 100% critical micelle concentration (CMC). The electrolyte concentration of the suspensions dictated the kinetic stability of nano-TiO(2) thus influencing the transport and retention of the nanoaggregates in the saturated porous medium. With increasing ionic strength, the interaction between approaching nano-TiO(2) and nano-TiO(2) already deposited onto collectors surfaces seemed to be more favorable than the interaction between approaching nano-TiO(2) and bare collectors surfaces. The abrupt and gradual reduction in electrolyte concentration during the flushing cycles of the column experiments induced the release of previously deposited nano-TiO(2) suggesting attachment of nano-TiO(2) through secondary energy minimum.
研究了 TiO(2)纳米颗粒（纳米-TiO(2)）的聚集、传输和沉积动力学（即附着和释放），考察了离子强度以及阴离子（十二烷基苯磺酸钠，SDBS）和非离子（曲拉通 X-100）表面活性剂在 100%临界胶束浓度（CMC）下的影响。悬浮液中的电解质浓度决定了纳米-TiO(2)的动力学稳定性，从而影响纳米聚集体在饱和多孔介质中的传输和保留。随着离子强度的增加，接近的纳米-TiO(2)与已沉积在收集器表面上的纳米-TiO(2)之间的相互作用似乎比接近的纳米-TiO(2)与裸露的收集器表面之间的相互作用更有利。在柱实验的冲洗循环过程中，电解质浓度的突然和逐渐降低导致先前沉积的纳米-TiO(2)的释放，表明纳米-TiO(2)通过二级能量最小值附着。
