Selective adsorption of phenanthrene dissolved in surfactant solution using activated carbon.
Selective adsorption of phenanthrene dissolved in surfactant solution using activated carbon.
复制标题
DOI：
10.1016/j.chemosphere.2007.06.018
复制
发表时间：
2007-11
期刊：
影响因子：
8.8
通讯作者：
C. Ahn;Y. M. Kim;S. Woo;J. M. Park
中科院分区：
文献类型：
--
作者：
C. Ahn;Y. M. Kim;S. Woo;J. M. Park
研究了活性炭选择性吸附一种有害的疏水性有机化合物（HOC）作为土壤洗涤过程后表面活性剂回收的一种手段。作为模型体系，选择菲作为代表HOC和Triton X-100作为非离子表面活性剂。在吸附实验中使用三种不同尺寸的活性炭（Darco 20-40（D20）、12-20（D12）和4-12（D4）目尺寸）。表面活性剂在活性炭上的吸附在临界胶束浓度以上表现出恒定的最大值，D20、D12和D4的临界胶束浓度分别为0.30、0.23和0.15gg− 1。菲对Triton X-100的选择性在活性炭剂量（0- 6 gl −1）和菲初始浓度（10- 110 mgl −1）的宽范围内远高于1。选择性一般随颗粒尺寸减小、活性炭用量增加和菲初始浓度降低而增加。在10 mgl − 1菲、5 gl − 1 Triton X-100和1 gl − 1活性炭的初始条件下，D20、D12和D4的最高选择性分别为74.9、57.3和38.3。在D20的情况下，在相同的条件下，86.5%的初始菲通过吸附被去除，并且93.6%的初始Triton X-100在选择性吸附过程之后保留在溶液中。结果表明，活性炭的选择性吸附是一个很好的替代表面活性剂回收在土壤洗涤过程中。
Selective adsorption of a hazardous hydrophobic organic compound (HOC) by activated carbon as a means of recovering surfactants after a soil washing process was investigated. As a model system, phenanthrene was selected as a representative HOC and Triton X-100 as a nonionic surfactant. Three activated carbons that differed in size (Darco 20–40 (D20), 12–20 (D12) and 4–12 (D4) mesh sizes) were used in adsorption experiments. Adsorption of surfactant onto activated carbon showed a constant maximum above the critical micelle concentration, which were 0.30, 0.23, 0.15gg−1for D20, D12, and D4, respectively. Selectivity for phenanthrene to Triton X-100 was much higher than 1 over a wide range of activated carbon doses (0–6gl−1) and initial phenanthrene concentrations (10–110mgl−1). Selectivity generally increased with decreasing particle size, increasing activated carbon dose, and decreasing initial concentration of phenanthrene. The highest selectivity was 74.9, 57.3, and 38.3 for D20, D12, and D4, respectively, at the initial conditions of 10mgl−1phenanthrene, 5gl−1Triton X-100 and 1gl−1activated carbon. In the case of D20 at the same conditions, 86.5% of the initial phenanthrene was removed by sorption and 93.6% of the initial Triton X-100 remained in the solution following the selective adsorption process. The results suggest that the selective adsorption by activated carbon is a good alternative for surfactant recovery in a soil washing process.