改性纳米ZnO/壳聚糖复合膜的制备及其对甲基橙的吸附

摘要

Using zinc nitrate and ammonia as raw materials, nano zincoxide powder was prepared by homogeneous precipi?tation method. Nano-ZnO/chitosan composite membrane (ZnO-CTF) was prepared by adding amount of nano-ZnO modi?fied by tetramethoxysilane in 1%chitosan solution. XRD, SEM, FT-IR and TG were used to characterization. The results show that ZnO is hexagonal crystal structure, with an average particle size of 34 nm and large surface area;the modified ZnO with good dispersibility has the same hexagonal crystal structure but the diffraction peak becomes narrow and diffrac?tion intensity becomes strong. The optimum adding amount of modified nano-ZnO is 0.15 g with good film performance and 90.9% adsorption rate. Compared with the chitosan membrane (CTF), the adsorption performance of ZnO-CTF is stronger than that of CTF, the adsorption rate is 3 times of CTF. ZnO and chitosan have synergistic effect on ZnO-CTF ad?sorption of methyl orange.%用硝酸锌和氨水为原料，以均匀沉淀法制备纳米氧化锌，经四甲氧基硅烷表面改性后，加入1%壳聚糖溶液中，制得纳米氧化锌/壳聚糖复合膜（ZnO-CTF），采用XRD、SEM、FT-IR和TG进行表征.结果表明ZnO为六方晶体结构，平均粒度为34 nm，表面积大，达到纳米级别；改性后的氧化锌晶型不变，衍射峰变窄，衍射强度变强，分散性良好.改性ZnO的最佳添加量为0.15 g时成膜性能好，对甲基橙的吸附率可达90.9%，与纯壳聚糖膜（CTF）吸附甲基橙相比较，ZnO-CTF的吸附性能更好，吸附率是CTF的3倍. ZnO与壳聚糖在ZnO-CTF对甲基橙的吸附中具有协同作用.