Wu Zhuyu, Yang Qiliang, Cui Can, Wu Yiyi, Xie Yadian, Wang Huanjiang
School of Chemical Engineering, Key Laboratory of Low-Dimensional Materials and Big Data, Guizhou Minzu University, Guizhou Provincial Key Laboratory of Low Dimensional Materials and Environmental and Ecological Restorations, Guiyang, Guizhou 550025, PR China.
School of Chemical Engineering, Key Laboratory of Low-Dimensional Materials and Big Data, Guizhou Minzu University, Guizhou Provincial Key Laboratory of Low Dimensional Materials and Environmental and Ecological Restorations, Guiyang, Guizhou 550025, PR China.
J Hazard Mater. 2024 Jul 5;472:134608. doi: 10.1016/j.jhazmat.2024.134608. Epub 2024 May 15.
Amphiphilic aromatic poly (amino acids) polymers were designed as biodegradability demulsifiers with higher aromaticity, stronger polarity, and side chain-like combs. The effects of demulsifier dosage, structural characteristics and emulsion properties such as pH, salinity, and oil content on the demulsification efficiency were investigated. The results show that the poly (L-glutamic-benzyl ester)-block-poly (L-phenylalanine) (PBLG-b-PPA) as the demulsifier can remove more than 99.97% of the oil in a 5.0 wt% oil-in-water (O/W) emulsion at room temperature within 2 min. The poly (L-tyrosine)-block-poly (L-phenylalanine) (PTyr-b-PPA) with environmental durability demonstrates high effectiveness, universality, and demulsification speed. It achieves a remarkable demulsification efficiency of up to 99.99% for a 20.0 wt% O/W emulsion at room temperature. The demulsification mechanism indicates that demulsifiers have sufficient interfacial activity can quickly migrate to the oil-water interface after being added to the emulsions. Additionally, when demulsifiers are present in a continuous phase in the molecular form, their "teeth" side chains are beneficial for increasing coalescence and flocculation capacities. Furthermore, according to the Density Functional Theory (DFT) calculations, enhancing the intermolecular interactions between demulsifiers and the primary native surfactants that form an oil-water interfacial film is a more efficient approach to reducing demulsification temperature and improving demulsification efficiency and rate.
两亲性芳香族聚（氨基酸）聚合物被设计为具有更高芳香性、更强极性和侧链梳状结构的可生物降解破乳剂。研究了破乳剂用量、结构特征以及乳液性质（如pH值、盐度和含油率）对破乳效率的影响。结果表明，聚（L-谷氨酸苄酯）-嵌段-聚（L-苯丙氨酸）（PBLG-b-PPA）作为破乳剂，在室温下2分钟内可去除5.0 wt%水包油（O/W）乳液中99.97%以上的油。具有环境耐久性的聚（L-酪氨酸）-嵌段-聚（L-苯丙氨酸）（PTyr-b-PPA）表现出高效性、通用性和破乳速度。对于20. wt%的O/W乳液，在室温下其破乳效率高达99.99%。破乳机理表明，具有足够界面活性的破乳剂加入乳液后能迅速迁移到油水界面。此外，当破乳剂以分子形式存在于连续相中时，其“齿状”侧链有利于提高聚结和絮凝能力。此外，根据密度泛函理论（DFT）计算，增强破乳剂与形成油水界面膜的主要天然表面活性剂之间的分子间相互作用是降低破乳温度、提高破乳效率和速率的更有效方法。
