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A polymeric-ceramic hybrid membrane with a self-cleaning and super-wettable surface decorated with polypyrrole-G-C3N4 photocatalyst for oily wastewater treatment

聚吡咯 材料科学 化学工程 光催化 过滤(数学) 陶瓷膜 渗透 乳状液 结垢 接触角 膜污染 陶瓷 聚合 复合材料 聚合物 化学 有机化学 催化作用 生物化学 统计 工程类 数学
作者
Umair Baig,Abdul Waheed,Nidal Abu‐Zahra,Isam H. Aljundi
出处
期刊:Separation and Purification Technology [Elsevier BV]
卷期号:339: 126487-126487 被引量:8
标识
DOI:10.1016/j.seppur.2024.126487
摘要

Treating oily wastewater is an enormous challenge as it leads to excessive membrane fouling due to the deposition of components of oily feed onto the membrane surface. Hence, the current work has been focused on developing a polymeric-ceramic hybrid membrane with photocatalytic self-cleaning antifouling properties. To yield the desired membrane, a polypyrrole-graphitic carbon nitride (PPy-G-C3N4) photocatalyst was decorated in the polyamide (PA) active layer of the membrane by interfacial polymerization (IP) onto the surface of alumina support. The chemistry of the active layer of the PPy-G-C3N4/PA@Alumina ceramic membrane led to the special wettability feature of being underwater superoleophobic which is reflected by underwater oil contact angle of θO, W = 159.9°. Even though the membrane surface features do not allow the oil to wet the membrane surface during filtration, the membrane surface fouling was inevitable during filtration experiments. With distilled water as feed, the permeate flux of PPy-G-C3N4/PA@Alumina ceramic membrane reached 650 L m−2 h−1 (LMH) at a pressure of 8 bar. A separation efficiency of >99 % was observed by using a feed of 100 ppm oil-in-water (O/W) emulsion. However, the permeate flux declined while using O/W emulsion as feed, where a 92 LMH to 50 LMH was observed after 60 min of continuous filtration. The performance of the membrane was recovered after exposure to solar-simulated light owing to the presence of PPy-G-C3N4 photocatalyst in the active layer where a recovery of ∼90 % of permeate flux was recorded. Hence, the current approach of fabricating a hybrid membrane proved to be useful for efficiently treating a challenging feed consisting of a complex oily matrix.
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