Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Biomedical Research Center, Engineering Research Center of Key Technology and Industrialization of Cell-based Vaccine, Ministry of Education, Gan-su Tech Innovation Center of Animal, China-Malaysia National Joint Laboratory, Northwest Minzu University, Lanzhou, Gansu, 730030, China; School of Chemical Engineering, Northwest Minzu University, Lanzhou, Gansu, 730124, China.
Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Biomedical Research Center, Engineering Research Center of Key Technology and Industrialization of Cell-based Vaccine, Ministry of Education, Gan-su Tech Innovation Center of Animal, China-Malaysia National Joint Laboratory, Northwest Minzu University, Lanzhou, Gansu, 730030, China.
J Environ Manage. 2024 Sep;367:122069. doi: 10.1016/j.jenvman.2024.122069. Epub 2024 Aug 3.
Studying the adsorption behavior of cationic surfactants can help to develop more effective strategies to limit their dispersion in the environment. However, there have few studies on the adsorption of cationic surfactants from the perspective of critical micelle concentration (CMC). In this study, with cetyltrimethylammonium bromide (CTAB) and octadecyl trimethylammonium bromide (OTAB) serving as the model cationic surfactants, the effect of CMC on the adsorption behavior of cationic surfactant onto the surface of sodium alginate/silica (SA/SiO) microspheres was systematically revealed. The adsorption mechanism relative to CMC was investigated under different conditions, including surfactant concentration, pH, temperature, and adsorption time. The results suggest that at identical concentrations, the smaller the CMC value of the cationic surfactants, the greater the adsorption amount (q). q for CTAB and OTAB were 583.2 and 678.0 mg/g respectively, with the concentration higher than their CMC value. When the concentration was lower than the CMC value of the cationic surfactants, q for CTAB and OTAB were 123.2 and 138.7 mg/g, respectively. The CMC value of CTAB was lower than that of OTAB under identical conditions, suggesting that the adsorption of cationic surfactants is related to their CMC. These results are beneficial for the removal of cationic surfactants by adsorption methods.
研究阳离子表面活性剂的吸附行为有助于开发更有效的策略来限制它们在环境中的分散。然而，从临界胶束浓度（CMC）的角度研究阳离子表面活性剂的吸附的研究很少。在这项研究中，以十六烷基三甲基溴化铵（CTAB）和十八烷基三甲基溴化铵（OTAB）为模型阳离子表面活性剂，系统地揭示了 CMC 对阳离子表面活性剂在海藻酸钠/二氧化硅（SA/SiO）微球表面吸附行为的影响。在不同条件下，包括表面活性剂浓度、pH 值、温度和吸附时间，研究了与 CMC 相关的吸附机制。结果表明，在相同浓度下，阳离子表面活性剂的 CMC 值越小，吸附量（q）越大。CTAB 和 OTAB 的 q 值分别为 583.2 和 678.0 mg/g，浓度高于其 CMC 值。当浓度低于阳离子表面活性剂的 CMC 值时，CTAB 和 OTAB 的 q 值分别为 123.2 和 138.7 mg/g。在相同条件下，CTAB 的 CMC 值低于 OTAB，表明阳离子表面活性剂的吸附与 CMC 有关。这些结果有利于通过吸附方法去除阳离子表面活性剂。
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