新型木质素基树脂的制备工艺优化及吸附性能评价

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10g，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74.29mg/g。

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

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 orthogonal experiments. The results show that the optimum conditions are: a mass of sodium lignosulfonate of 10g, temperature of 190℃, mass percentage of glucose in sodium lignosulfonate of 5%, and pH value of the reaction solution of 0.5. And the yield of LBR can reached 37.75% under the optimum conditions.Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (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 10μm, 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 74.29mg/g.