Ding Xiaoliang, Yan Yejun, Gu Zhexuan, Shi Rui, Wang Yaxin, Xu Guoxin, Hu Zhijun, Jiang Zhicheng
School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou 310023, China.
School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou 310023, China.
J Hazard Mater. 2025 Aug 15;494:138603. doi: 10.1016/j.jhazmat.2025.138603. Epub 2025 May 12.
Desalination has long been a critical strategy to address the global shortage of freshwater resources. However, the purification of oily seawater introduces additional complex challenges. This study presents the development of an eco-friendly, collagen fibers-based porous material (CFsPM), fabricated by binding collagen fibers with hydroxypropyl methylcellulose as a sustainable adhesive. Subsequently, Fe-tannic acid coordination system was introduced into the collagen fibers to prepare a bifunctional porous material (Fe-P@CFsPM), designed for both emulsion separation and solar-driven seawater desalination. The coordination and hydrogen bonding interactions between the Fe-tannic acid complex and the -COOH/-OH/-NH groups of CFs, as well as the phenolic -OH groups of tannic acid, established stable cross-linked networks that enhanced the material's mechanical properties. Fe-P@CFsPM demonstrated outstanding performance in separating oil-in-water emulsions, with a separation flux exceeding 5500 L·m·h and separation efficiency greater than 99.95%, owing to its superwettability in air and superoleophobicity in water. The hierarchical fibrous structure and the formation of the dark coordination complex within the collagen fibers significantly boosted the photothermal conversion efficiency of Fe-P@CFsPM. With the excellent self-desalting capability benefited from the superhydrophilicity and hierarchical transport properties, Fe-P@CFsPM maintained a superior evaporation rate (> 1.50 kg·m·h) for solar-driven evaporation of both low- and high-salinity seawater under 1.0 sun irradiation, with the produced fresh water meeting WHO standards. This bifunctional porous material, derived from collagen fibers, provides an integrated solution for oily seawater purification and presents a novel approach for the high-value utilization of collagen fibers.
长期以来，海水淡化一直是解决全球淡水资源短缺的关键策略。然而，含油海水的净化带来了额外的复杂挑战。本研究展示了一种环保型、基于胶原纤维的多孔材料（CFsPM）的开发，该材料通过将胶原纤维与羟丙基甲基纤维素作为可持续粘合剂结合而成。随后，将铁 - 单宁酸配位体系引入胶原纤维中，制备了一种双功能多孔材料（Fe - P@CFsPM），用于乳液分离和太阳能驱动的海水淡化。铁 - 单宁酸络合物与CFs的 - COOH / - OH / - NH基团以及单宁酸的酚 - OH基团之间的配位和氢键相互作用建立了稳定的交联网络，增强了材料的机械性能。由于其在空气中的超亲水性和在水中的超疏油性，Fe - P@CFsPM在分离水包油乳液方面表现出色，分离通量超过5500 L·m⁻²·h，分离效率大于99.95%。胶原纤维内的分级纤维结构和深色配位络合物的形成显著提高了Fe - P@CFsPM的光热转换效率。凭借超亲水性和分级传输特性带来的优异自脱盐能力，Fe - P@CFsPM在1.0个太阳辐照下对低盐度和高盐度海水的太阳能驱动蒸发均保持较高的蒸发速率（> 1.50 kg·m⁻²·h），产生的淡水符合世界卫生组织标准。这种源自胶原纤维的双功能多孔材料为含油海水净化提供了一种综合解决方案，并为胶原纤维的高值利用提出了一种新方法。
