盐酸四环素在Nafion膜上的吸附动力学及其介导的金微纳米晶体的生长

Insights into adsorption of tetracycline hydrochloride into a Nafion film and growth of Au crystals

实验发现,盐酸四环素能够很好吸附到Nafion膜上,动力学研究表明其吸附是与浓度相关并由扩散控制的一级动力学过程,扩散系数为8.5×10-9 cm2 s-1,遵循BET吸附等温线,表明其多层吸附特性.研究表明,当吸附了盐酸四环素的Nafion膜浸入合适浓度的氯金酸溶液时,盐酸四环素能够介导金微纳米晶体在Nafion膜上的生长,且通过简单改变氯金酸溶液的浓度,可以调控金微纳米晶体的形态.这一实验结果为金属微纳米材料Nafion聚合物复合膜的制备提供了新思路,这种金微纳米材料Nafion聚合物复合膜在化学生物传感设计和材料科学领域具有潜在的应用价值.

Tetracycline hydrochloride （Tc） was found to be adsorbed well into a Nation （Nf） film. The kinetic analysis suggested that the adsorption of Tc into the Nf film is controlled by its diffusion in the Nf film with a diffusion coefficient of D=8.5× 10-9 cm2 s-1. The adsorption isothermal was analyzed by a Brunauer-Emmett-Teller （BET） equation suggesting multilayer adsorption of Tc into the film. Furthermore, the growth of gold crystals could be observed if the Tc-adsorbed Nf film was dipped into the HAuC14 solution, and the experimental results demonstrate that the shape of gold nanocrystals can be controlled by simply changing the concentration of HAuCI4 solution. The research results are significant and the approach described here would provide new train of thought to develop composite functional film consisting of metal nanoparticles embedded in a polymer matrix. New materials with novel properties originating from the combination of the inorganic components and the polymer can be made and they have promising applications in the field of optical sensing.