Recyclable and Reusable Maleic Acid for Efficient Production of Cellulose Nanofibrils with Stable Performance
Recyclable and Reusable Maleic Acid for Efficient Production of Cellulose Nanofibrils with Stable Performance
复制标题
DOI：
10.1021/acssuschemeng.9b05766
复制
发表时间：
2019-12-16
影响因子：
8.4
通讯作者：
Dai, Hongqi
中科院分区：
文献类型：
--
作者：
Bian, Huiyang;Luo, Jing;Dai, Hongqi
纤维素纳米原纤维（CNF）因其独特的机械和光学特性而引起了极大的关注，在复合材料、包装材料和电子产品中具有多种应用。然而，CNF 的绿色、低成本和可持续生产仍然具有挑战性。在此，开发了一种使用可回收固体有机酸马来酸（MA）的经济系统，从漂白纸浆纤维制备羧化 CNF。 CNF的物理和化学性质可以通过调节酸水解强度或组合水解因子来调节。由于MA的水溶性较低，通过简单的结晶技术进行水解反应后，可以很容易地回收，收率约为90%。 MA的回收性实验表明，在第四次循环中，酸的回收率仍然为84%，并且在整个回收循环中，回收的MA的化学结构几乎没有变化。更重要的是，回收过程后水解效率没有降低，从而使所得的CNF具有稳定的性能。总的来说，这项工作提供了一种绿色且经济可行的方法来回收和再利用 MA，以实现 CNF 的可持续和大规模生产。
Cellulose nanofibrils (CNFs) have attracted great attention because of their unique mechanical and optical properties for a variety of applications in composites, packaging materials, and electronics. Green, low-cost, and sustainable production of CNFs, however, is still challenging. Herein, an economic system using a type of a recyclable solid organic acid, maleic acid (MA), was developed to prepare carboxylated CNFs from bleached pulp fibers. The physical and chemical properties of the CNF can be tailored by adjusting the acid hydrolysis intensity or combined hydrolysis factor. Because of its low water solubility, MA can be easily recovered with a yield of approximately 90% after hydrolysis reactions through simple crystallization technology. The recyclability experiment of MA showed that the recovery yield of the acid was still 84% in the fourth cycle and the chemical structure of the recycled MA was almost unchanged throughout the recycling cycles. More importantly, the hydrolysis efficiency was not decreased after the recycling process, thereby endowing the resulting CNF with stable performance. Overall, this work provides a green and economically feasible method to recover and reuse MA for sustainable and large-scale production of CNFs.