Sridhar Vadahanambi, Park Hyun
Global Core Research Centre for Ships and Offshore Plants (GCRC-SOP), Pusan National University, Busan 46241, Korea.
Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan 46241, Korea.
Materials (Basel). 2020 Jun 25;13(12):2850. doi: 10.3390/ma13122850.
Though recycling of waste paper is widely practiced but usually it is downgraded to lower valued recycled waste paper. Based on this concern, we report the development of novel NaOH/urethane aqueous system for extraction of microfibrillated cellulose from waste paper. The purity of so obtained microfibrillated cellulose (MFC) was evaluated by morphological tests using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and by evaluation of physicochemical properties using Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Morphologies of MFC studied by SEM and TEM showed that the size of purified cellulose fibrils reduced when compared to that of waste paper but fibrils are cleaner and smoother due to the removal of talc and lignin. XRD analysis revealed that MFC exhibits good crystallinity. The utility of sulfonated and pristine microfibrillar cellulose in removal of lead from contaminated water is also reported. Our results show that renewable, sustainable, cheap, and waste biomass like waste paper can be used for producing valuable second-generation high-value products.
尽管废纸回收利用已广泛开展，但通常会被降级为价值较低的再生废纸。基于这一担忧，我们报道了一种新型的NaOH/聚氨酯水性体系，用于从废纸中提取微纤化纤维素。通过使用扫描电子显微镜（SEM）和透射电子显微镜（TEM）的形态学测试，以及使用傅里叶变换红外（FTIR）光谱、X射线衍射（XRD）、差示扫描量热法（DSC）和热重分析（TGA）对物理化学性质进行评估，来评价如此获得的微纤化纤维素（MFC）的纯度。通过SEM和TEM研究的MFC形态表明，与废纸相比，纯化纤维素原纤维的尺寸减小，但由于滑石粉和木质素的去除，原纤维更干净、更光滑。XRD分析表明MFC具有良好的结晶度。还报道了磺化和原始微纤化纤维素在去除污染水中铅方面的效用。我们的结果表明，像废纸这样可再生、可持续、廉价的废弃生物质可用于生产有价值的第二代高价值产品。
