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Comprehensive utilization strategy of cellulose in a facile, controllable, high-yield preparation process of cellulose nanocrystals using aqueous tetrabutylphosphonium hydroxide
Green Chemistry ( IF 9.3 ) Pub Date : 2021-1-25 , DOI: 10.1039/d0gc04370b Fangchao Cheng 1, 2, 3, 4, 5 , Panpan Zhao 1, 2, 3, 4, 5 , Tulong Ouyang 1, 2, 3, 4, 5 , Jianping Sun 1, 2, 3, 4, 5 , Yiqiang Wu 6, 7, 8, 9
Green Chemistry ( IF 9.3 ) Pub Date : 2021-1-25 , DOI: 10.1039/d0gc04370b Fangchao Cheng 1, 2, 3, 4, 5 , Panpan Zhao 1, 2, 3, 4, 5 , Tulong Ouyang 1, 2, 3, 4, 5 , Jianping Sun 1, 2, 3, 4, 5 , Yiqiang Wu 6, 7, 8, 9
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Cellulose nanocrystals (CNC) have attracted great attention due to their excellent physical properties, abundant functional groups, and extensive use in many fields. However, how to facilely and efficiently prepare CNC and utilize the cellulosic raw materials comprehensively are still major challenges. Herein, a comprehensive utilization strategy of cellulose is implemented by facile, high-yield, controllable CNC preparation and effective enzymatic hydrolysis of the cellulosic residue. CNC with a mixed crystal form of cellulose I and cellulose II was successfully prepared through the partial dissolution of cellulose in an aqueous tetrabutylphosphonium hydroxide (TBPH) solution under mild conditions followed by regeneration, short-term ultrasonic dispersion, resulting in a high CNC yield of up to 72.2%, high crystallinity of up to 72.1%, and tunable dimensions and crystal structure of CNC. The characterization results confirmed that the present method produced a nonderivative form of cellulose and changed its crystalline structure to varying degrees, and CNC exhibited thermal stability comparable to that of the raw materials. A partial dissolution/regeneration/ultrasonic dispersion mechanism was proposed for this CNC preparation process. Cellulose residue obtained from the CNC production process led to a high enzymatic hydrolysis rate of up to 89.1%, which was twice as high as that of the raw material. The overall process finally resulted in a comprehensive cellulose utilization rate of more than 95%. The present strategy provides a candidate approach for the comprehensive utilization of cellulose through the synchronous production of advanced high-performance materials and fine chemicals.
中文翻译：
氢氧化四丁基phosph水溶液在纤维素纳米晶体的快速，可控，高产率制备过程中纤维素的综合利用策略
纤维素纳米晶体（CNC）由于其出色的物理性能，丰富的官能团以及在许多领域中的广泛使用而备受关注。然而，如何简便有效地制备CNC并全面利用纤维素原料仍然是主要的挑战。在此，通过简便，高产，可控的CNC制备以及纤维素残留物的有效酶水解，可以实现纤维素的综合利用策略。通过在温和条件下将纤维素部分溶解在氢氧化四丁基phosph水溶液（TBPH）中，然后进行再生，短期超声分散，成功地制备了具有纤维素I和纤维素II混合晶型的CNC，从而获得了较高的CNC收率。高达72.2％，高结晶度高达72.1％，以及CNC的可调尺寸和晶体结构。表征结果证实了本发明方法产生了纤维素的非衍生物形式并且改变了其晶体结构的程度，并且CNC表现出与原材料相当的热稳定性。针对该CNC制备过程，提出了部分溶解/再生/超声分散机理。从CNC生产过程中获得的纤维素残留物导致高达89.1％的高酶水解率，是原料的两倍。最终，整个过程的纤维素综合利用率超过95％。
更新日期：2021-02-10
中文翻译：
氢氧化四丁基phosph水溶液在纤维素纳米晶体的快速，可控，高产率制备过程中纤维素的综合利用策略
纤维素纳米晶体（CNC）由于其出色的物理性能，丰富的官能团以及在许多领域中的广泛使用而备受关注。然而，如何简便有效地制备CNC并全面利用纤维素原料仍然是主要的挑战。在此，通过简便，高产，可控的CNC制备以及纤维素残留物的有效酶水解，可以实现纤维素的综合利用策略。通过在温和条件下将纤维素部分溶解在氢氧化四丁基phosph水溶液（TBPH）中，然后进行再生，短期超声分散，成功地制备了具有纤维素I和纤维素II混合晶型的CNC，从而获得了较高的CNC收率。高达72.2％，高结晶度高达72.1％，以及CNC的可调尺寸和晶体结构。表征结果证实了本发明方法产生了纤维素的非衍生物形式并且改变了其晶体结构的程度，并且CNC表现出与原材料相当的热稳定性。针对该CNC制备过程，提出了部分溶解/再生/超声分散机理。从CNC生产过程中获得的纤维素残留物导致高达89.1％的高酶水解率，是原料的两倍。最终，整个过程的纤维素综合利用率超过95％。
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