Gong Runming, Ma Zihao, Wang Xing, Han Ying, Guo Yanzhu, Sun Guangwei, Li Yao, Zhou Jinghui
Liaoning Key Laboratory of Pulp and Papermaking Engineering, Dalian Polytechnic University Dalian Liaoning 116034 China
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology Guangzhou 510640 China.
RSC Adv. 2019 Sep 13;9(50):28902-28907. doi: 10.1039/c9ra04568f.
Waste newspaper is one of the most common cellulosic materials. Therefore, effective utilization of this commonly available biomass resource to prepare high-value carbon-based solid acid catalysts is an interesting and meaningful task. In this study we propose a new route for waste newspaper valorization, in which sulfonic-acid-functionalized carbon fiber can be directly produced from waste newspaper as a recyclable carbon based solid acid catalyst (WCSA) for the hydrolysis of cellulose. The as-prepared sulfonic-acid-functionalized carbon fiber contained -SOH, -COOH, and phenolic -OH groups and exhibited good catalytic activity for the hydrolysis of cellulose. WCSA prepared under sulfonation conditions at a temperature of 100 °C and for a duration of 10 h has a higher sulfonic acid content. A total reducing sugars (TRS) yield of 58.2% was obtained with a catalyst/microcrystalline cellulose (MCC) ratio of 4 at 150 °C using a reaction time of 6 h. The recycling performance of the WCSA catalyst indicated that the TRS remained almost stable for five cycles during the hydrolysis of cellulose.
废报纸是最常见的纤维素材料之一。因此，有效利用这种常见的生物质资源来制备高价值的碳基固体酸催化剂是一项有趣且有意义的任务。在本研究中，我们提出了一种废报纸增值利用的新途径，其中可以直接从废报纸制备磺酸功能化碳纤维，作为用于纤维素水解的可回收碳基固体酸催化剂（WCSA）。所制备的磺酸功能化碳纤维含有-SOH、-COOH和酚羟基，对纤维素水解表现出良好的催化活性。在100℃温度下磺化10小时制备的WCSA具有较高的磺酸含量。在150℃下使用6小时的反应时间，催化剂/微晶纤维素（MCC）比例为4时，总还原糖（TRS）产率达到58.2%。WCSA催化剂的循环性能表明，在纤维素水解过程中，TRS在五个循环中几乎保持稳定。
