Dialdehyde cellulose (DAC) and polyethyleneimine (PEI) coated polyvinylidene fluoride (PVDF) membrane for simultaneously removing emulsified oils and anionic dyes

• Published in: Journal of hazardous materials Vol. 471; p. 134341
• Main Authors: Liu, Junliang, Huang, Yixuan, Zhang, Ganwei, Wang, Qianhui, Shen, Shusu, Liu, Dapeng, Hong, Yaoliang, Wyman, Ian
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 05.06.2024
• Subjects: Coating; Dialdehyde cellulose; Oil and dye removal; Polyethyleneimine; PVDF membrane; Polyethyleneimine; PVDF membrane; Coating; Oil and dye removal; Dialdehyde cellulose
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2024.134341

Developing high-efficiency membrane for oil and dye removal is very urgent, because wastewater containing them can cause great damage to human and environment. In this study, a coated membrane was fabricated by applying DAC and PEI onto the commercial PVDF microfiltration membrane for supplying the demand. The coated membrane presents superhydrophlic and superoleophobic properties with a water contact angle of 0o and underwater oil contact angle exceed 150°, as well as excellent low underwater oil adhesion performance. The coated membrane shows high separation efficiency exceeded 99.0% and flux 350.0 L·m−2·h−1 when used for separating for six kinds of oil including pump oil, sunflower oil, n-hexadecane, soybean oil, diesel and kerosene in water emulsions. Additionally, the coated membrane can effectively remove anionic dyes, achieving rejection rates of 94.7%, 93.4%, 92.3%, 90.7% for the CR, MB, RB5, AR66, respectively. More importantly, the membrane was able to simultaneously remove emulsified oil and soluble anionic dyes in wastewater containing both of them. Therefore, this novel coated membrane can be a promising candidate for treating complex wastewater. [Display omitted] •The DAC and PEI were applied onto PVDF membrane surface for modification.•The coated membrane was high hydrophilicity and underwater superoleophobic.•The coated membrane can be used for separating different oil water emulsions.•The coated membrane can simultaneously remove emulsified oils and anionic dyes.