Riana Ulfa, Ramli Muliadi, Iqrammullah Muhammad, Raharjo Yanuardi, Wibisono Yusuf
Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Syiah Kuala, Darussalam, Banda Aceh 23111, Indonesia.
Research Center for Environmental and Natural Resources, Universitas Syiah Kuala, Darussalam, Banda Aceh 23111, Indonesia.
Membranes (Basel). 2022 Apr 17;12(4):435. doi: 10.3390/membranes12040435.
Inorganic-organic composite membranes (IOCMs) are an alternative separation method developed for their straightforward process, economic benefits, and ease of scaling up. The IOCMs in this study were prepared from a biopolymer chitosan matrix and rice husk-based silica filler to remove impurities from crude biodiesel. The IOCMs were prepared through phase inversions, in which the priorly prepared silica particles were dispersed in the dope solution of chitosan. The maximum loading of the silica particles was 60%, capable of reducing the soap level, free glycerol level, and acid number from 547.9 to 12.2 mg/L, 54 to 0.041%, and 2.02 to 1.12 mgKOH/g. These reduced impurity values have satisfied the standardized quality. The chemical composition and morphology of the IOCM was characterized using Fourier-transform infrared spectroscopy and scanning electron microscope-energy dispersive X-Ray spectroscopy. The IOCM water absorption-based porosity and swelling degree were studied as well. Further investigation using isothermal modeling revealed the adsorption dependency against the Sips model equation (R = 0.99 and root-mean-square errors = 1.77 × 10). Even though regeneration is still a challenging factor in this study, the IOCM prepared from chitosan and rice husk-derived silica particles could be used in crude biodiesel purification.
无机-有机复合膜（IOCMs）是一种替代性分离方法，因其工艺简单、经济效益高且易于扩大规模而得以开发。本研究中的无机-有机复合膜由生物聚合物壳聚糖基质和稻壳基二氧化硅填料制备而成，用于去除粗生物柴油中的杂质。无机-有机复合膜通过相转化法制备，即将预先制备的二氧化硅颗粒分散在壳聚糖的铸膜液中。二氧化硅颗粒的最大负载量为60%，能够将皂含量、游离甘油含量和酸值从547.9降至12.2 mg/L、从54%降至0.041%、从2.02降至1.12 mgKOH/g。这些降低后的杂质值符合标准质量要求。使用傅里叶变换红外光谱和扫描电子显微镜-能量色散X射线光谱对无机-有机复合膜的化学成分和形态进行了表征。还研究了基于无机-有机复合膜吸水的孔隙率和溶胀度。使用等温模型的进一步研究揭示了吸附对Sips模型方程的依赖性（R = 0.99，均方根误差 = 1.77×10）。尽管在本研究中再生仍然是一个具有挑战性的因素，但由壳聚糖和稻壳衍生的二氧化硅颗粒制备的无机-有机复合膜可用于粗生物柴油的提纯。
