A novel series of environmentally friendly cationic surfactants were synthesized by reaction of mixed fatty acids, extracted from waste frying oil (WFO) as a low-cost raw material, and N,N-Dimethyl-1,3-propanediamine with high yield products. The synthesized fatty amides were reacted with different alkyl halides and dimethyl sulphate to form the desired cationic surfactants. The acquired compounds were elucidated via different spectroscopic tools as IR, ¹H and ¹³C NMR spectra. Surface properties including critical micelle concentration, effectiveness, maximum surface excess, minimum surface area…. etc. was investigated. Also, thermodynamic parameters including free energy of adsorption (ΔG_ads^o) and micellization (ΔG_mic^o) were calculated. The petroleum capacities of synthesized compounds were evaluated in the diluted and solid form with waters varying in salinity. The results showed that the synthesized compounds have good surface properties, high tendency to be adsorbed at the surface than micellized and high ability to collect and disperse the petroleum film from water surface (the effect ranging from 95–97%). Moreover, the antimicrobial activities of synthesized cationic surfactants against various microbes were investigated.

通过混合脂肪酸的反应合成了一系列新型的环保型阳离子表面活性剂，从廉价的废油炸油（WFO）中提取了N，N-二甲基-1,3-丙二胺，得到了高收率的产品。合成的脂肪酰胺与不同的烷基卤和硫酸二甲酯反应形成所需的阳离子表面活性剂。所获得的化合物通过不同的光谱工具如IR，¹ H和¹³ C NMR光谱进行阐明。表面特性包括临界胶束浓度，有效性，最大表面过量，最小表面积……。等进行了调查。此外，热力学参数，包括吸附的自由能（ΔG_广告^Ø）和胶束（ΔG_麦克风^ö）进行了计算。用盐度变化的水以稀释和固体形式评估合成化合物的石油容量。结果表明，所合成的化合物具有良好的表面性质，比胶束具有更高的吸附在表面的趋势，并且具有从水表面收集和分散石油膜的能力（效果在95％到97％之间）。此外，研究了合成的阳离子表面活性剂对各种微生物的抗菌活性。