Abstract：
Aqueous foam injection is a promising technique for in-situ remediation of soil and aquifers contaminated by petroleum products. However, the application efficiency is strongly hindered by foam\'s instability upon contact with hydrocarbons. Addressing this, we propose a new binary surfactant mixture of Sodium Dodecyl Sulfate (SDS) and Cocamidopropyl Hydroxysultaine (CAHS). This study investigates CAHS\'s role as a co-surfactant in enhancing foam stability against antifoaming diesel oil under static and dynamic conditions. Using a dynamic foam analyzer (DFA-100), we assessed static foam\'s stability by monitoring decay profiles and bubble growth over time. The results revealed that the highest stability can be reached at a CAHS to SDS ratio of 50:50, increasing the half-life of the foam by 7.7 times. Remarkably, our analyses at bulk and bubble scales also elucidated the mechanisms behind the enhanced foam stability of the proposed binary surfactant mixture in the absence and presence of diesel. Additionally, in a 1D sand column, the SDS-CAHS mixture demonstrated more than twofold improvement of the Resistance Factor, attributed to the better survival of the lamellae due to the reduced rate of their destruction. This formulation also yielded a recovery improvement of >10 % compared to SDS foam. The significant improvements in stability and performance of the SDS-CAHS (50:50) mixture were credited to a robust pseudo-emulsion film formation, creating a higher oil entry barrier. This reinforcement and the surfactant molecules\' synergistic interactions at the gas-liquid-oil interface significantly contributed to the overall effectiveness.
摘要：
水性泡沫注入是一种用于原位修复被石油产品污染的土壤和含水层的有前途的技术。然而,泡沫与碳氢化合物接触后的不稳定性强烈阻碍了应用效率。解决这个问题，我们提出了一种新的二元表面活性剂混合物十二烷基硫酸钠（SDS）和椰油酰氨基丙基羟基磺胺酮（CAHS）。本研究调查了CAHS作为助表面活性剂在静态和动态条件下增强泡沫稳定性对消泡柴油的作用。使用动态泡沫分析仪(DFA-100),我们通过监测衰减曲线和气泡随时间的增长来评估静态泡沫的稳定性。结果表明，在CAHS与SDS的比例为50：50时，可以达到最高的稳定性，使泡沫的半衰期增加了7.7倍。值得注意的是,我们的分析在体积和气泡规模也阐明了背后的机制，提高泡沫稳定性的建议二元表面活性剂混合物在不存在和存在的柴油。此外,在一维砂柱中，SDS-CAHS混合物显示出抗性因子的两倍以上的改善，归因于薄片的存活率降低。与SDS泡沫相比,该制剂还产生>10%的回收率改善。SDS-CAHS（50:50）混合物的稳定性和性能的显着改善归功于强大的假乳液成膜，创造更高的石油进入壁垒。这种增强和表面活性剂分子在气-液-油界面的协同相互作用显着有助于整体有效性。
