Photocatalytic demulsification of oil/water emulsions containing nonionic surfactant

被引:4
|
作者
Shubair, Asma [1 ]
Al-Salih, Hilal [1 ]
Sabouni, Rana [1 ]
Gomaa, Hassan [2 ]
Hassanin, Sara [1 ]
Salem, Soha [1 ]
Zeno, Talah [1 ]
El Taher, Bassam [1 ]
Zaka, Awais [1 ]
机构
[1] Amer Univ Sharjah, Dept Chem Engn, POB 26666, Sharjah, U Arab Emirates
[2] Western Univ, Dept Chem & Biochem Engn, London, ON, Canada
关键词
Photocatalysis; Demulsification; Emulsions; Zinc oxide; Titanium dioxide; IN-WATER EMULSIONS; OIL; TIO2; SEPARATION; NANOPARTICLES; COALESCENCE; PREDICTION; STABILITY; KINETICS; ANATASE;
D O I
10.1007/s11356-020-11541-1
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Separation of oil-water (OW) emulsions is investigated using a photocatalytic demulsification approach. Experiments were conducted using two types of photocatalysts, namely, ZnO and TiO2. The emulsion samples were prepared with oil to water ratios of 1:3, 1:1, and 3:1 and using nonionic surfactant Tween 20 as an emulsifier. The demulsification efficiency was determined using a direct time varying phase separation measurement, while dynamic light scattering (DLS) and microscope imaging (MI) were used to determine the change in emulsion droplets size. The investigation results showed that all the emulsions were destabilized and separated within 30-90 min with demulsification efficiency that ranged from 38 to 90%. On the other hand, untreated control samples remained stable with no phase separation for more than 24 h. For most of the studied experimental conditions, TiO2 nanoparticles gave better demulsification results than ZnO. Modeling of the batch demulsification kinetics for both systems agreed satisfactorily with the experimental measurements. This could allow its further extension towards design of continuous processes for potential implementation in treatment of industrial oily wastewaters.
引用
收藏
页码:13124 / 13132
页数:9
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