新型木质素基树脂的制备工艺优化及吸附性能评价  

Optimization of preparation technology and performance evaluation of a new lignin-based resin

作　　者：梁凤兵[1] 宋彦磊[1] 黄崇品[1] 陈标华[1] 

机构地区：[1]北京化工大学化学工程学院化工资源有效利用国家重点实验室,北京100029

出　　处：《北京化工大学学报（自然科学版）》2013年第5期56-60,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家自然科学基金(20806007);国家“973”计划(2010CB226902)

摘　　要：以木质素磺酸钠和葡萄糖为原料,采用溶液聚合法制备了一种新型球形木质素基树脂(LBR)。通过正交试验筛选制备LBR的工艺条件,得到制备LBR的优化工艺条件为:木质素磺酸钠用量10 g,聚合反应温度190℃,葡萄糖用量5%(占木质素磺酸钠的质量分数),体系pH 0.5。在此优化条件下,制备的LBR产率达到37.75%。利用红外光谱、热重分析、X衍射分析、扫描电镜及Boehm滴定等分析测试手段对LBR的结构和物性进行了表征和测定,结果表明所制备的LBR是由随机样式极强的无定形高聚物组成,且负载有大量酸性基团(羧基、内酯基和酚羟基);在低于250℃时,LBR具有良好的热稳定性;LBR呈现球形颗粒状,具有发达的微孔结构,较大的比表面积,有效粒径范围在1～10μm之间。此外,室温条件下,LBR对Cr(VI)的饱和吸附量高达74.29 mg/g。A new lignin-based resin （LBR） was prepared by condensation polymerization of sodium lignosulfonate with glucose under acidic conditions, and the process conditions for the preparation of LBR were optimized by or- thogonal experiments. The results show that the optimum conditions are ： a mass of sodium lignosulfonate of 10 g, temperature of 190 ℃ , mass percentage of glucose in sodium lignosulfonate of 5% , and pH value of the reaction so- lution of 0.5. And the yield of LBR can reached 37.75% unde the optimum conditions. Fourier transform infrared spectroscopy （FT-IR） , thermogravimetric analysis （TGA）, X-ray diffraction （XRD） , scanning electron microsco- py （SEM） and Boehm titration were used to characterize the structure and properties of LBR. The analysis results reveal that LBR appears to be composed of microcellular-structure spherical particles with grain sizes in the range of 1 to 10 μm, which are composed of amorphous high polymers that have a high density of acidic groups and high thermal stability under 250℃. Moreover, at the room temperature, the maximum adsorption capacity of LBR for Cr （VI） adsorption was 74. 29 mg/g.

关 键 词：木质素磺酸钠 球形树脂 正交试验 结构表征 铬吸附 

分 类 号：TQ326[化学工程—合成树脂塑料工业]