Simultaneous recovery of surfactants and retrieval of hydrophobic organic contaminants (HOC) from the eluent in surfactant-enhanced washing is essential for saving useful resources and avoiding secondary contamination. A pH-triggered precipitation-dissolution switchable surfactant, sodium 3-laurylaminopropanesulphonic acid (LMPS), for both emulsified and micellar eluents was reported. After tuning the pH from 12.5 to 7.5, the water-soluble LMPS is converted to its oil–water insoluble inner salt LMP; then LMP is converted back to LMPS by varying pH to 12.5, by which the LMPS-based micelles and emulsions are of reversibly switchable under pH stimuli. The removal ratio of tetradecane (15 g/30 g sand) and phenanthrene (Phe, 3.5 mg/5g sand) is no less than 99 % by washing with 150 g LMPS solution (1.0 × 10⁻² mol/L) and 100 g LMPS solution (0.5 wt%), respectively. The retrieval ratio of tetradecane from the emulsified eluents was around 94 % and without obvious adverse effects over 5 cycles. The retrieval ratio of Phe from the micellar eluents via a combination of co-precipitation and Soxhelt extraction was around 98 %, which can be further simplified and increased to ∼100 % by spiking the micellar eluents with a small amount of tetradecane (1 g /100 g eluent). The recovery ratio of LMPS from micellar eluents was approximately 96 %, and in the case of emulsified eluents it remained around 99 % after 5 cycles. After a simple and conventional treatment with anion-exchange resin and active carbon (0.25 g/100 g waste water), the chemical oxygen demand (COD) of the waste water was remarkably reduced from 500 to 1700 mg O₂ L⁻¹ to less than 30 mg O₂ L⁻¹.

在表面活性剂增强洗涤中同时回收表面活性剂和从洗脱液中回收疏水性有机污染物 (HOC) 对于节省有用资源和避免二次污染至关重要。报道了一种用于乳化和胶束洗脱液的 pH 触发沉淀溶解可切换表面活性剂 3-月桂基氨基丙磺酸钠 (LMPS)。将 pH 值从 12.5 调整到 7.5 后，水溶性 LMPS 转化为其油-水不溶性内盐 LMP；然后通过将 pH 值改变为 12.5，将 LMP 转化回 LMPS，由此基于 LMPS 的胶束和乳液在 pH 刺激下可逆地转换。用150 g LMPS溶液(1.0 × 10 ^-2 mol/L) 和 100 g LMPS 溶液 (0.5 wt%), 分别。乳化洗脱液中十四烷的回收率约为 94%，并且在 5 个循环中没有明显的副作用。通过共沉淀和 Soxhelt 提取的组合从胶束洗脱液中回收 Phe 的比例约为 98%，这可以通过在胶束洗脱液中加入少量十四烷（1 g / 100 克洗脱液）。胶束洗脱液中 LMPS 的回收率约为 96%，而对于乳化洗脱液，5 个循环后仍保持在 99% 左右。经过阴离子交换树脂和活性炭（0.25 g/100 g 废水）简单常规处理后，废水的化学需氧量（COD）从 500 mg O 2 显着降低至 1700 mg O ₂ L ^-1至小于30mg O ₂  L ^-1。