Tan Jia, Sun Jiaming, Ma Chunhui, Luo Sha, Li Wei, Liu Shouxin
College of Materials Science and Engineering, Northeast Forestry University, Harbin 150040, China.
Key Laboratory of Bio-Based Material Science and Technology of the Ministry of Education, Northeast Forestry University, Harbin 150040, China.
Polymers (Basel). 2023 Jan 26;15(3):638. doi: 10.3390/polym15030638.
The global challenge of oil pollution calls for the efficient selective recovery of oil or organics from oil-water mixtures. A pH-responsive carbon foam (CF) made from liquefied larch sawdust (LLS) with switchable wettability was fabricated in this work. After grafted with poly 4-vinyl pyridine (P4vp), the CF obtained a switchable wettability surface, which allowed the CF to exhibit superhydrophilicity and superhydrophobicity at different pH levels, respectively. The results revealed that the pH-responsive CF possessed a three-dimensional (3D) spongy-like skeleton and porous structure with a diameter between 50 and 200 µm. Thus, the pH-responsive CF could absorb 15-35 g/g of oil/organics in a neutral aqueous solution at pH = 7 and desorb all the absorbate within 40 s after immersion in an aqueous solution at pH = 1. Moreover, only about 2.8% loss was observed for organic (chloroform) absorption and recovery after reusing up to 15 cycles, which indicated promising prospects in oil and organic recovery.
石油污染这一全球性挑战要求从油水混合物中高效选择性地回收油或有机物。在这项工作中，用液化落叶松木屑（LLS）制备了一种具有可切换润湿性的pH响应性碳泡沫（CF）。在接枝聚4-乙烯基吡啶（P4vp）后，CF获得了可切换润湿性表面，这使得CF分别在不同pH水平下表现出超亲水性和超疏水性。结果表明，pH响应性CF具有三维（3D）海绵状骨架和直径在50至200 µm之间的多孔结构。因此，pH响应性CF在pH = 7的中性水溶液中可吸收15 - 35 g/g的油/有机物，并且在浸入pH = 1的水溶液后40 s内可解吸所有吸附物。此外，在重复使用多达15个循环后，有机（氯仿）吸收和回收仅观察到约2.8%的损失，这表明在油和有机物回收方面具有广阔前景。
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