Jia Bowen, Chen Xiang, Shen Yunfei, Li Zilu, Ma Xue, Yu Hou-Yong
Key Laboratory of Intelligent Textile and Flexible Interconnection of Zhejiang Province, Zhejiang Sci-Tech University, Xiasha Higher Education Park Avenue 2 No.928, Hangzhou 310018, China.
Huzhou City Linghu Xinwang Chemical Co., Ltd, Huzhou 313018, China.
Carbohydr Polym. 2024 Oct 15;342:122395. doi: 10.1016/j.carbpol.2024.122395. Epub 2024 Jun 15.
Discharging wastewater from industrial dyeing and printing processes poses a significant environmental threat, necessitating green and efficient adsorbents. Cellulose nanocrystals (CNCs) have emerged as a promising option for dye adsorbing. However, the industrial production and commercialization of CNCs still faced low yield, time-consuming, and uneco-friendly. In this study, we proposed a facile hydrochloric/maleic acid (HCl/CHO) hydrolysis method to synthesize carboxylated CNCs using Box-Behnken design and dual response surface design, which can systematically investigate the effect of experimental factors (temperature, time and HCl/CHO volume ratio) on the final products. The rod-liked carboxylated CNCs gave the highest yield of 90.50 %, maximum carboxyl content of 1.29 mmol/g, and efficient dye removal ratio of 91.5 %. Furthermore, compared to CNCs obtained by commonly sulfuric acid hydrolysis way (CNCs-S) with a T of 242.6 °C, the CNCs extracted at 5 h exhibited significantly improved thermal stability with T reaching 351.2 °C. The enriched carboxyl content and excellent thermal stability show potential wastewater treatment applications under harsh conditions.
工业印染过程中排放的废水对环境构成了重大威胁，因此需要绿色高效的吸附剂。纤维素纳米晶体（CNCs）已成为一种有前景的染料吸附材料。然而，CNCs的工业化生产和商业化仍面临产量低、耗时且不环保的问题。在本研究中，我们提出了一种简便的盐酸/马来酸（HCl/CHO）水解方法，采用Box-Behnken设计和双响应面设计来合成羧化CNCs，该方法可以系统地研究实验因素（温度、时间和HCl/CHO体积比）对最终产物的影响。棒状羧化CNCs的产率最高可达90.50%，最大羧基含量为1.29 mmol/g，染料去除率高达91.5%。此外，与通过常规硫酸水解法（CNCs-S）在242.6℃下获得的CNCs相比，在5小时时提取的CNCs热稳定性显著提高，热稳定性温度达到351.2℃。丰富的羧基含量和优异的热稳定性表明其在苛刻条件下具有潜在的废水处理应用前景。
