间硝基苯磺酸钠助催化硫酸水解制备芦苇浆纳米纤维素

以间硝基苯磺酸钠(SMS)为助催化剂,质量分数 55% 硫酸水解芦苇浆制备纳米纤维素(NCC)。研究反应温度、反应时间以及SMS添加量对NCC的产率及粒径的影响。结果表明NCC最佳制备工艺条件为:反应温度 50℃,反应时间 3.0 h,间硝基苯磺酸钠添加量10%(以芦苇浆质量计)。傅里叶变换红外(FT-IR)光谱分析表明最佳工艺条件制备的NCC为纤维素类物质;透射电子显微镜和扫描电子显微镜图分析表明以SMS为助催化剂制备的的NCC形貌更规整,呈棒状。相同NCC制备工艺条件下,与十二烷基苯磺酸钠(SDBS)和硫酸铜(CuSO₄)两种助催化剂相比,助催化剂SMS制备的NCC产率最高。

Preparation of Reed Pulp Nanocrystalline Cellulose by Sulfuric Acid Hydrolysis with Sodium m-Nitrobenzene Sulfonate as Cocatalyst

Nanocrystalline cellulose （NCC） was prepared from reed pulp with 55 % （by mass fraction） sulfuric acid and using sodium m-nitrobenzene sulfonate （SMS） as cocatalyst. The effects of reaction temperature and time, the addition of SMS on the yield and the mean size of NCC were studied. The results show that the optimal reaction temperature and time are 50℃ and 3.0 h, respectively, and the additon of sodium m-nitrobenzene sulfonate is 10 % （based on mass of reed pulp）. Analysis of fourier transform infrared （FT-IR） spectroscopy show that the prepared NCC with optimal condition is cellulosic substance. Analysis of transmission electron microscopy（TEM） and scanning electron microscopy（SEM） show that the morphology of NCC prepared by adding SMS as cocatalyst appears more regular and rod-like. The yield of NCC with addition of SMS as cocatalyst is the highest under the same preparation technology which is compared with the cocatalyst of sodium dodecyl benzene sulfonate （SDBS） and copper sulfate（ CuSO4 ）.