pH开关聚醚型非离子表面活性剂及其去除土壤中菲的潜在应用

doi:10.3969/j.issn.2097-2806.2025.11.003

摘要/Abstract

摘要： 为实现从非离子型表面活性剂增强土壤洗涤的洗脱液回收和循环再用表面活性剂，设计合成了一种对pH具有可逆开关响应的聚醚型非离子表面活性剂C8-DIB-PEG₁₀，并以该表面活性剂的胶束溶液为洗脱剂，以菲污染的土壤为例，分别考察了土壤中菲的洗除效果、洗脱液的后处理和C8-DIB-PEG₁₀的回收再利用等。结果表明，在25 ℃时C8-DIB-PEG₁₀的临界胶束浓度约为1.01×10^-3 mol/L；用HCl将pH调至3.0时，C8-DIB-PEG₁₀因亚胺键断裂形成水溶性良好的PEG₁₀-CHO和正辛胺盐酸盐而丧失表面活性，再用NaOH将pH调至10.0时，C8-DIB-PEG₁₀能够再次形成。土壤中菲的洗脱率可达99.9%，经过HCl诱导C8-DIB-PEG₁₀关闭活性后，PEG₁₀-CHO和正辛胺盐酸盐随水相可以循环再利用，C8-DIB-PEG₁₀的回收率可达96.5%，且再经过3次循环使用，菲的洗脱率和C8-DIB-PEG₁₀的回收率均未出现明显异常改变。

关键词: pH开关非离子表面活性剂, 表面活性剂增强土壤洗涤, 菲（Phe）, 表面活性剂循环利用

Abstract:

To achieve the recovery and recycling of eluent from soil washing enhanced by nonionic surfactants, a polyether-type nonionic surfactant C8-DIB-PEG₁₀ with a reversible pH-responsive switch was designed and synthesized. Taking an artificial sample of phenanthrene-contaminated soil as an example, and using the micellar solution of this surfactant as the washing agent, the removal effect on phenanthrene （Phe） in soil, the post-treatment of eluent, and the recovery and recycling of C8-DIB-PEG₁₀ were investigated. The results showed that the critical micelle concentration of C8-DIB-PEG₁₀ at 25 ℃ was approximately 1.01×10^-3 mol/L; when pH was adjusted to 3.0 with HCl, C8-DIB-PEG₁₀ lost its surface activity due to the breaking of imine bond, forming PEG₁₀-CHO and octylamine hydrochloride, both of which had good water solubility. When pH was adjusted to 10.0 with NaOH, C8-DIB-PEG₁₀ could be formed again. The removal rate of Phe in soil could reach 99.9%. After C8-DIB-PEG₁₀was switched to non-surface-active by using HCl, PEG₁₀-CHO and octylamine hydrochloride could be recycled in the aqueous phase. The recovery rate of C8-DIB-PEG₁₀ could reach 96.5%. Over three more cycles of use, no significant abnormal change was observed either in the removal rate of Phe or the recovery rate of C8-DIB-PEG₁₀.

Key words: pH-switchable nonionic surfactant, surfactant-enhanced soil washing, phenanthrene, recycling of surfactants

中图分类号:

TQ423

董雷, 邹欢金, 刘雪锋. pH开关聚醚型非离子表面活性剂及其去除土壤中菲的潜在应用[J]. 日用化学工业（中英文）, 2025, 55(11): 1388-1394.

Lei Dong, Huanjin Zou, Xuefeng Liu. Synthesis of pH-switchable nonionic polyether surfactant and its potential application in removing phenanthrene from soil[J]. China Surfactant Detergent & Cosmetics, 2025, 55(11): 1388-1394.

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