Peng Yun, Zhao Shuang, Huang Chuanlin, Deng Feifei, Liu Jie, Liu Chunhua, Li Yibao
Engineering Research Center of Jiangxi Province for Bamboo-Based Advanced Materials and Biomass Conversion, College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, China.
Polymers (Basel). 2023 Dec 19;16(1):14. doi: 10.3390/polym16010014.
Super-wetting interface materials have shown great potential for applications in oil-water separation. Hydrogel-based materials, in particular, have been extensively studied for separating water from oily wastewater due to their unique hydrophilicity and excellent anti-oil effect. In this study, a superhydrophilic and underwater superoleophobic bamboo cellulose hydrogel-coated mesh was fabricated using a feasible and eco-friendly dip-coating method. The process involved dissolving bamboo cellulose in a green alkaline/urea aqueous solvent system, followed by regeneration in ethanol solvent, without the addition of surface modifiers. The resulting membrane exhibited excellent special wettability, with superhydrophilicity and underwater superoleophobicity, enabling oil-water separation through a gravity-driven "water-removing" mode. The super-wetting composite membrane demonstrated a high separation efficiency of higher than 98% and a permeate flux of up to 9168 L·m·h for numerous oil/water mixtures. It also maintained a separation efficiency of >95% even after 10 cycles of separation, indicating its long-term stability. This study presents a green, simple, cost-effective, and environmentally friendly approach for fabricating superhydrophilic surfaces to achieve oil-water separation. It also highlights the potential of bamboo-based materials in the field of oil-water separation.
超润湿性界面材料在油水分离应用中显示出巨大潜力。特别是水凝胶基材料，因其独特的亲水性和优异的抗油效果，已被广泛研究用于从含油废水中分离水。在本研究中，采用一种可行且环保的浸涂法制备了一种超亲水和水下超疏油的竹纤维素水凝胶涂层网。该过程包括将竹纤维素溶解在绿色碱性/尿素水性溶剂体系中，然后在乙醇溶剂中再生，无需添加表面改性剂。所得膜表现出优异的特殊润湿性，具有超亲水性和水下超疏油性，能够通过重力驱动的“脱水”模式实现油水分离。这种超润湿性复合膜对多种油/水混合物表现出高于98%的高分离效率和高达9168 L·m⁻²·h⁻¹的渗透通量。即使经过10次分离循环后，它仍保持>95%的分离效率，表明其具有长期稳定性。本研究提出了一种绿色、简单、经济高效且环保的方法来制备超亲水表面以实现油水分离。它还突出了竹基材料在油水分离领域的潜力。
