Loraine G A
Air Force Research Laboratory, AFRL/MLQR, 139 Barnes Dr. Tyndall AFB, FL 32403, USA.
Water Res. 2001 Apr;35(6):1453-60. doi: 10.1016/s0043-1354(00)00422-x.
The effects of surfactants, sodium dodecyl sulfate (SDS) and Triton X-a00 (TX), and alcohols (methanol, ethanol, and propanol) on the dehalogenation of TCE and PCE by zero-valent iron were examined. Surface concentrations of PCE and TCE on the iron were dependent on aqueous surfactant concentrations. At concentrations above the CMC, sorbed halocarbon concentrations declined and concentrations associated with solution phase micelles increased. The anionic surfactant SDS ([SDS] < CMC) did not affect reduction rates, until the CMC was exceeded after which reactivity decreased, possibly due to sequestering of the TCE and PCE in mobile micelles. The nonionic TX showed a mixed effect on reactivity, increasing the PCE reduction rate, but not affecting TCE removal. Production of TCE from PCE increased in the presence of TX. Similar experiments showed that methanol, ethanol, and propanol inhibited reduction of TCE and PCE by metallic iron. Zero-valent iron may be useful in recycling soil washing effluents contaminated with TCE and PCE.
研究了表面活性剂十二烷基硫酸钠（SDS）和 Triton X-100（TX）以及醇类（甲醇、乙醇和丙醇）对零价铁还原三氯乙烯（TCE）和四氯乙烯（PCE）脱卤的影响。铁表面 PCE 和 TCE 的浓度取决于水相中表面活性剂的浓度。在高于临界胶束浓度（CMC）时，吸附的卤代烃浓度下降，与溶液相胶束相关的浓度增加。阴离子表面活性剂 SDS（[SDS]<CMC）在未超过 CMC 时不影响还原速率，但超过 CMC 后反应性降低，这可能是由于 TCE 和 PCE 被隔离在移动胶束中。非离子型 TX 对反应性有混合影响，提高了 PCE 的还原速率，但不影响 TCE 的去除。在 TX 存在下，PCE 生成 TCE 的量增加。类似实验表明，甲醇、乙醇和丙醇会抑制金属铁对 TCE 和 PCE 的还原。零价铁可能有助于回收受 TCE 和 PCE 污染的土壤冲洗废水。
