我国土壤重金属污染严重，场地污染问题尤为突出，修复技术需求迫切。络合剂增强表面活性剂泡沫修复是最具前景的重金属污染修复技术之一。重金属易与泡沫发生静电和配位作用，形成稳定的络合体系，分离困难，因而导致修复过程中抽出泡沫分离成本高且工艺复杂。针对重金属与表面活性剂泡沫有效分离难这一关键科学问题，基于开关表面活性剂增溶作用可逆可控原理，提出重金属污染土壤可逆泡沫修复方法(RSFR)。采用CO2/空气开关表面活性剂在活性态具有增溶及非活性态胶束破坏的特性，实现表面活性剂分离。拟开展以下研究：开关表面活性剂及其复配淋洗液的发泡能力及泡沫稳定性；可逆泡沫在土壤介质中的迁移及空间分布特征；可逆泡沫对重金属的增溶效能及可逆可控作用规律；开关表面活性剂在土壤介质中的吸附行为、多相间分配特征。研究成果可为泡沫修复技术提供表面活性剂回收与利用新途径，推动该技术在污染土壤化学修复中的应用。

Due to serious contaminated soils by heavy metals, especially in contaminated sites, China needs urgently the remediation technologies for contaminated soils. Complexant enhanced surfactant foam remediation is one of the most effective remediation methods for heavy metal contaminated soils. Because of intrinsic thermodynamics stability of surfactant micelles, it is difficult to separate surfactant from the mixed system containing heavy metal pollutants resulting in the high cost and complex processes for the separation of flushing foams in the whole remediation process. Aiming at the key scientific problem for the effective separation of surfactants foams and heavy metal pollutants during the regeneration process, this project propose the method of reversible surfactant foam-enhanced remediation (RSFR) for heavy metals polluted soils based on the principle of reversible and controllable solubilization of switchable surfactants. The recycle of CO2/air switchable surfactant micelle solubilization-release can be conducted based on the solubilization characteristic in its active state and micelles disassembled in its inactive state. This study will focus on the following issues: the foaming ability and foam stability of switchable surfactants and the mixed system of switchable surfactants with conventional surfactants; the delivery and spatial distribution characteristics of switchable surfactant foams in soils; the solubilization ability of switchable surfactant foams for heavy metal pollutants and reversible solubilized mechanism of heavy metals; the sorption behavior and multiphase partition characteristic of switchable surfactants in soils. These results may will provide the new approach for the recycling utilization of surfactants and promote the application of SFR in the chemical remediation of contaminated soils.