在无催化剂条件下，于TBAA/DMSO混合溶剂中用琥珀酸酐对纤维素进行改性。
Modification of Cellulose with Succinic Anhydride in TBAA/DMSO Mixed Solvent under Catalyst-Free Conditions.
作者信息
Xin Ping-Ping, Huang Yao-Bing, Hse Chung-Yun, Cheng Huai N, Huang Chaobo, Pan Hui
机构信息
College of Chemical Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China.
Southern Research Station, USDA Forest Service, Pineville, LA, 71360, USA.
出版信息
Materials (Basel). 2017 May 12;10(5):526. doi: 10.3390/ma10050526.
Homogeneous modification of cellulose with succinic anhydride was performed using tetrabutylammonium acetate (TBAA)/dimethyl sulfoxide (DMSO) mixed solvent. The molar ratio of succinic anhydride (SA) to free hydroxyl groups in the anhydroglucose units (AGU), TBAA dosage, reaction temperature, and reaction time were investigated. The highest degree of substitution (DS) value of 1.191 was obtained in a 10 wt% TBAA/DMSO mixed solvent at 60 °C for 60 min, and the molar ratio of SA/AGU was 6/1. The molar ratio of SA/AGU and the TBAA dosage showed a significant influence on the reaction. The succinoylated cellulose was characterized by ATR-FTIR, TGA, XRD, solid state CP/MAS C NMR spectroscopy (CP/MAS C NMR), and SEM. Moreover, the modified cellulose was applied for the adsorption of Cu and Cd, and both the DS values of modified cellulose and pH of the heavy metal ion solutions affected the adsorption capacity of succinylated cellulose. The highest capacity for Cu and Cd adsorption was 42.05 mg/g and 49.0 mg/g, respectively.
使用乙酸四丁铵（TBAA）/二甲基亚砜（DMSO）混合溶剂对纤维素进行丁二酸酐的均相改性。研究了丁二酸酐（SA）与脱水葡萄糖单元（AGU）中游离羟基的摩尔比、TBAA用量、反应温度和反应时间。在10 wt%的TBAA/DMSO混合溶剂中，于60℃反应60分钟，SA/AGU的摩尔比为6/1时，获得了最高取代度（DS）值1.191。SA/AGU的摩尔比和TBAA用量对反应有显著影响。通过衰减全反射傅里叶变换红外光谱（ATR-FTIR）、热重分析（TGA）、X射线衍射（XRD）、固体交叉极化/魔角旋转碳核磁共振光谱（CP/MAS C NMR）和扫描电子显微镜（SEM）对琥珀酰化纤维素进行了表征。此外，将改性纤维素用于铜和镉的吸附，改性纤维素的DS值和重金属离子溶液的pH值均影响琥珀酰化纤维素的吸附容量。对铜和镉的最高吸附容量分别为42.05 mg/g和49.0 mg/g。
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