Guandong-candy-inspired electrolessly welded composite polyvinylidene fluoride (PVDF) membranes with self-cleaning and recyclable properties for efficient oil-in-water emulsion separation

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL Separation and Purification Technology Pub Date : 2024-10-29 DOI:10.1016/j.seppur.2024.130311

Jingcheng Wu, Yi He, Yiling He, Wanwan Peng, Daqing Wu

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Abstract

Recently, oily wastewater has become an urgent cross-regional problem. Membrane technology is considered a sound solution to this crisis. However, membrane fouling causes a sharp decrease in water permeance and service life, which greatly restricts membrane applications. In addition to a few degradable materials, the most severely polluted membranes are burned or buried in the soil, wasting resources and accelerating ecological damage. Inspired by Guandong candy, we reported a novel, facile, and green approach to construct composite polyvinylidene fluoride (PVDF) membranes with stable self-cleaning, anti-oil-fouling, and photocatalytic recovery properties for efficient oil-in-water emulsions separation. Due to the synergistic effect of the superhydrophilic tin dioxide/titanate nanotubes (SnO₂/TNTs) and Guandong-candy-inspired electrolessly welding organic–inorganic hybrid colloids, the composite PVDF membrane showed remarkable stability and underwater oil-repellency properties. Accordingly, the composite PVDF membrane achieved excellent water permeance (>2600 L m⁻² h⁻¹ bar⁻¹), superior separation efficiency (>99.6 %), and long-term antifouling performance during soybean oil-in-water emulsion separation. More importantly, the composite PVDF membrane exhibited highly efficient self-cleaning and recovery of the PVDF membrane and SnO₂/TNTs under visible-light irradiation. Within the framework of green and sustainable concepts, this is a novel reusable idea for the recyclable utilization of commercial PVDF membranes and photocatalytic minerals in oily wastewater purification.

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具有自清洁和可回收特性的关东糖启发式无电解焊接复合聚偏氟乙烯 (PVDF) 膜，用于高效分离水包油型乳液

最近，含油废水已成为一个紧迫的跨区域问题。膜技术被认为是解决这一危机的合理方案。然而，膜污垢会导致透水性和使用寿命急剧下降，从而极大地限制了膜的应用。除少数可降解材料外，污染最严重的膜会被焚烧或埋入土壤，既浪费资源，又加速生态破坏。受关东糖的启发，我们报道了一种新颖、简便、绿色的方法来构建具有稳定自清洁、抗油污和光催化回收性能的复合聚偏二氟乙烯（PVDF）膜，用于高效分离水包油型乳化液。由于超亲水性二氧化锡/钛酸钾纳米管（SnO2/TNTs）和关东糖启发的无电焊有机无机杂化胶体的协同作用，复合 PVDF 膜表现出显著的稳定性和水下斥油性能。因此，该复合 PVDF 膜在大豆油水包水乳液分离过程中具有优异的透水性（2600 L m-2 h-1 bar-1）、分离效率（99.6%）和长期防污性能。更重要的是，在可见光照射下，复合 PVDF 膜显示出 PVDF 膜和 SnO2/TNTs 的高效自清洁和恢复功能。在绿色和可持续发展理念的框架下，这是一种可循环利用商用 PVDF 膜和光催化矿物进行含油废水净化的新思路。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.