Blaquera Aimee Lorraine M, Herrera Marvin U, Manalo Ronniel D, Maguyon-Detras Monet Concepcion, Futalan Cybelle Concepcion M, Balela Mary Donnabelle L
Sustainable Electronic Materials Group, Department of Mining, Metallurgical, and Materials Engineering, University of the Philippines Diliman, Quezon City 1101, Metro Manila, Philippines.
Institute of Mathematical Sciences and Physics, College of Arts and Sciences, University of the Philippines Los Baños, Los Baños 4031, Laguna, Philippines.
Polymers (Basel). 2023 Jan 15;15(2):452. doi: 10.3390/polym15020452.
This study used a simple and efficient dipping method to prepare oleophilic calcium stearate-coated kapok fibers (CaSt-KF) with improved hydrophobicity. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) confirmed the deposition of calcium stearate particles on the surface of the kapok fibers. This led to higher surface roughness and improved static water contact angle of 137.4°. The calcium stearate-coated kapok fibers exhibited comparable sorption capacities for kerosene, diesel, and palm oil. However, the highest sorption capacity of 59.69 g/g was observed for motor oil at static conditions. For motor oil in water, the coated fibers exhibited fast initial sorption and a 65% removal efficiency after 30 s. At equilibrium, CaSt-KF attained a sorption capacity of 33.9 g/g and 92.5% removal efficiency for motor oil in water. The sorption kinetics of pure motor oil and motor oil in water follows the pseudo-second-order kinetic model, and the Elovich model further described chemisorption. Intraparticle diffusion and liquid film diffusion were both present, with the latter being the predominant diffusion mechanism during motor oil sorption.
本研究采用一种简单高效的浸渍方法制备了具有改善疏水性的亲油性硬脂酸钙包覆木棉纤维（CaSt-KF）。傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）证实了硬脂酸钙颗粒沉积在木棉纤维表面。这导致了更高的表面粗糙度，并将静态水接触角提高到137.4°。硬脂酸钙包覆的木棉纤维对煤油、柴油和棕榈油表现出相当的吸附能力。然而，在静态条件下，对机油的最高吸附容量为59.69 g/g。对于水中的机油，包覆纤维表现出快速的初始吸附，30秒后去除效率达到65%。在平衡时，CaSt-KF对水中机油的吸附容量达到33.9 g/g，去除效率为92.5%。纯机油和水中机油的吸附动力学遵循准二级动力学模型，而埃洛维奇模型进一步描述了化学吸附。颗粒内扩散和液膜扩散都存在，后者是机油吸附过程中的主要扩散机制。
