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CeO2经阴离子表面改性剂SDS表面改性后,采用溶液共混法制备了壳聚糖/聚乙烯醇/CeO2复合膜,采用扫描电子显微镜(SEM)对复合膜的表面形貌进行表征;傅里叶红外光谱(FTIR)研究吸附前后复合膜上基团的变化;热重分析仪(TG)分析复合膜的热稳定性;测试复合膜的力学性能及溶胀率并进行分析,探讨CeO2和PVA的加入对壳聚糖膜力学性能和吸水率的影响;采用二苯碳酰二肼分光光度法研究时间对Cr(Ⅵ)吸附的影响。实验结果表明:改性后的CeO2在复合膜中分散均匀,与复合膜的相容性较好。随着CeO2的增加,复合膜的热稳定性提高,断裂强力和断裂伸长率增大,溶胀率下降,相比较纯壳聚糖膜,断裂强力最大可提高47.4%,溶胀率最大可下降53.9%。复合膜对Cr(Ⅵ)的平衡吸附量可以达到11.2mg/g。
CeO2 anionic surface modifier SDS surface modification, prepared by solution blending chitosan / polyvinyl alcohol / CeO2 composite membrane, the surface morphology of the composite membrane was characterized by scanning electron microscopy (SEM); Fu Fourier transform infrared spectroscopy (FTIR) was used to study the change of groups on the composite membrane before and after adsorption. The thermal stability of the composite membrane was analyzed by thermogravimetric analysis (TG). The mechanical properties and swelling ratio of the composite membrane were measured and analyzed. The effect of adding time on the mechanical properties and water absorption of chitosan film was investigated by diphenylcarbazide spectrophotometry. The experimental results show that the modified CeO2 is uniformly dispersed in the composite membrane and has good compatibility with the composite membrane. With the increase of CeO2, the thermal stability of the composite films increased, the breaking strength and elongation at break increased, and the swelling rate decreased. Compared with the pure chitosan film, the breaking strength increased by 47.4% and the swelling rate decreased by 53.9% at the maximum %. The equilibrium adsorption capacity of Cr (Ⅵ) on the composite membrane can reach 11.2mg / g.