通过完全去除水解硫酸基团，从办公废纸中制备热稳定的纤维素纳米球。

Thermally stable cellulose nanospheres prepared from office waste paper by complete removal of hydrolyzed sulfate groups.

机构信息

Department of Chemical Engineering, College of Engineering Technology, Can Tho University, Campus II, 3/2 Street, Xuan Khanh, Ninh Kieu, Can Tho, Viet Nam.

Department of Automation Technology, College of Engineering Technology, Can Tho University, Campus II, 3/2 Street, Xuan Khanh, Ninh Kieu, Can Tho, Viet Nam.

出版信息

Carbohydr Polym. 2022 Dec 1;297:120009. doi: 10.1016/j.carbpol.2022.120009. Epub 2022 Aug 18.

DOI:10.1016/j.carbpol.2022.120009

PMID:36184136

Abstract

Cellulose nanocrystals are commonly obtained by acid hydrolysis, particularly with HSO. However, a small amount of deposited sulfate-groups contributes to the degradation of their thermal stability. This study prepared thermally-stable and sulfate-group-free cellulose nanospheres (CNSs) from office waste paper by HSO hydrolysis followed by solvolytic desulfation. The optimal desulfation conditions (i.e., 5 wt% MeOH, reaction temperature of 90 °C, a reaction time of 20 min, 0.5 mM pyridine) were preliminarily found from a one-factor-at-a-time experiment and validated by the results of a central composite design. The optimal desulfation conditions promoted environmental sustainability with less pyridine and MeOH and comparably shorter reaction time. The desulfated CNSs had a significant thermal stability enhancement from 186 to 340 °C. Comprehensive characterization of the morphology, chemical composition, and thermal behavior of the desulfated CNSs reconfirmed the complete removal of sulfate groups without harmful pyridine residues, demonstrating the potential use of the thermally stable CNSs.

摘要

纤维素纳米晶体通常通过酸水解获得，特别是使用 HSO。然而，少量的沉积硫酸盐基团会导致其热稳定性下降。本研究通过 HSO 水解，然后通过溶剂解脱硫，从办公废纸中制备出热稳定且不含硫酸盐基团的纤维素纳米球（CNSs）。通过单因素实验初步找到了最佳的脱硫条件（即 5wt%甲醇、90°C 的反应温度、20min 的反应时间和 0.5mM 吡啶），并通过中心复合设计的结果进行了验证。最佳脱硫条件通过使用更少的吡啶和甲醇以及相当短的反应时间促进了环境可持续性。脱硫后的 CNSs 的热稳定性从 186°C 显著提高到 340°C。对脱硫 CNSs 的形貌、化学成分和热行为的综合表征证实了硫酸盐基团的完全去除，且没有有害的吡啶残留，表明热稳定的 CNSs 具有潜在的用途。