Shang Wenting, Sheng Zhanwu, Shen Yixiao, Ai Binling, Zheng Lili, Yang Jingsong, Xu Zhimin
College of Food Science and Technology, Hainan University, Haikou 570228, China.
Haikou Key Laboratory of Banana Biology, Haikou Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Haikou 570101, China.
Carbohydr Polym. 2016 May 5;141:135-42. doi: 10.1016/j.carbpol.2016.01.009. Epub 2016 Jan 6.
Banana cellulose contained number of hydrophilic hydroxyl groups which were succinylated to be hydrophobic groups with high oil affinity. Succinic anhydride was used to modify banana cellulose in 1-allyl-3-methylimidazolium chloride ionic liquid in this study. The modified banana cellulose had a high oil absorption capacity. The effects of reaction time, temperature, and molar ratio of succinic anhydride to anhydroglucose on the degree of substitution of modified banana cellulose were evaluated. The optimal reaction condition was at a ratio of succinic anhydride and anhydroglucose 6:1 (m:m), reaction time 60min and temperature 90°C. The maximum degree of acylation reaction reached to 0.37. The characterization analysis of the modified banana cellulose was performed using X-ray diffractometer, Fourier transform infrared spectrometer, scanning electron microscopy and thermogravimetry. The oil absorption capacity and kinetics of the modified banana cellulose were evaluated at the modified cellulose dose (0.025-0.3g), initial oil amount (5-30g), and temperature (15-35°C) conditions. The maximum oil absorption capacity was 32.12g/g at the condition of the cellulose dose (0.05g), initial oil amount (25g) and temperature (15°C). The kinetics of oil absorption of the cellulose followed a pseudo-second-order model. The results of this study demonstrated that the modified banana cellulose could be used as an efficient bio-sorbent for oil adsorption.
香蕉纤维素含有大量亲水性羟基，这些羟基被琥珀酰化成为具有高油亲和力的疏水性基团。本研究中使用琥珀酸酐在1-烯丙基-3-甲基咪唑氯盐离子液体中对香蕉纤维素进行改性。改性后的香蕉纤维素具有较高的吸油能力。评估了反应时间、温度以及琥珀酸酐与脱水葡萄糖的摩尔比对改性香蕉纤维素取代度的影响。最佳反应条件为琥珀酸酐与脱水葡萄糖的比例为6:1（质量比）、反应时间60分钟、温度90°C。酰化反应的最大取代度达到0.37。使用X射线衍射仪、傅里叶变换红外光谱仪、扫描电子显微镜和热重分析法对改性香蕉纤维素进行了表征分析。在改性纤维素剂量（0.025 - 0.3g）、初始油量（5 - 30g）和温度（15 - 35°C）条件下评估了改性香蕉纤维素的吸油能力和动力学。在纤维素剂量为0.05g、初始油量为25g、温度为15°C的条件下，最大吸油能力为32.12g/g。纤维素的吸油动力学遵循准二级模型。本研究结果表明，改性香蕉纤维素可作为一种高效的生物吸附剂用于油吸附。
