疏水性椰壳纤维的制备及其对油水体系的分离性能

Preparation of hydrophobic coir fiber for separation of oil/water

将椰壳纤维经过碱处理、甲基三甲氧基硅烷(MTMS)疏水化改性制备了具有孔隙结构的疏水椰壳纤维吸附材料(HCF)。通过SEM、EDS、FT-IR、XRD对HCF的表面形貌及化学结构进行了表征,通过静态水接触角研究了HCF的表面润湿性能。结果表明,HCF的静态水接触角为126°,在不同pH的溶液中水接触角都保持在125°以上。HCF对原油、泵油、葵花籽油、机油、大豆油、四氯化碳等油类及有机溶剂的吸附倍率为8.49~12.88 g/g,在3 min内达到吸附饱和,具有较好的吸附量和较快的吸附速率。在0.09 MPa压力下,HCF可用于水上浮油的连续分离过程,分离通量为57 326.14 L/(m^(2)·h),分离效率为97.02%,具有一定的处理大量油水混合物的能力。HCF经过10次循环后依然保持良好的吸附性能,具有很好的使用稳定性。

Hydrophobic adsorbent material from coconut shell fiber (HCF) with porous structure was prepared through alkali treatment and methyltrimethoxysilane (MTMS) hydrophobic modification of coconut shell fiber. The surface morphologies and chemical structures of HCF were characterized by SEM, EDS, FT-IR and XRD, and the surface wetting properties of HCF were investigated by static contact angle. The results showed that the static water contact angle of HCF was 126°, which remained 125° in the solutions with different pH. The adsorption capacity of HCF ranged from 8.49 to 12.88 g/g for oils (crude, pump, sunflower, motor and soybean oils) and organic solvents (carbon tetrachloride). The adsorption capacity reached equilibrium within 3 min with excellent adsorption capacity and rate. HCF could be used in the continuous separation of oil slick from water with a pressure of 0.09 MPa, and exhibited a separation flux of 57 326.14 L/(m^(2)·h) and a separation efficiency of 97.02%. The results confirmed HCF with excellent ability to treat large amounts of oil wastewater. Furthermore, HCF maintained good adsorption performance after 10 cycles recycling, verifying good stability of HCF.