反应温度对蒙脱石载银量及其缓释性能的影响

doi:10.11944/j.issn.1000-0518.2015.04.140260

摘要/Abstract

摘要：

以钠基蒙脱石(Na-MMT)为载体,氧化银与氨水反应形成的银氨络合物[Ag(NH₃)₂OH]为前驱体,通过离子交换和三乙醇胺(TEA)还原两步法制备了载银蒙脱石(Ag-MMT)。用佛尔哈德法测定了载银蒙脱石(Ag-MMT)的载银量,探讨了反应温度对MMT 载银量及其缓释性能的影响,并用FI-IR、XRD等技术手段对Na-MMT和Ag-MMT的结构进行了表征。结果表明,在蒙脱石与Ag⁺的质量比为20:1、离子交换时间为1 h、反应温度50 ℃,然后再加入三乙醇胺和聚乙烯吡咯烷酮,50 ℃下反应2 h,MMT的载银量最大,银的利用率达到86.89%,释放时间最持久,并且MMT的层状结构没有被破坏。

关键词: 载银蒙脱石, 制备, 温度, 缓释性能

Abstract:

Silver loaded montmorillonite(Ag-MMT) was prepared by ion-exchange and triethanolamine reduction two-step approach using [Ag(NH₃)₂OH] as the precursor for silver oxide and ammonia. The silver content in Ag-MMT was determined by the Volhard method. The effects of reaction temperature on silver loading, its release properties, and the structures of Na-MMT and Ag-MMT were characterized by FI-IR and XRD, respectively. The results show that the amount of silver loaded on the montmorillonite is maximum, the utilization rate of silver reaches up to 86.9% and the layered structure of MMT is remained under the optimized conditions:the mass ratio of montmorillonite to Ag⁺ is 20:1, the ion exchange time is 1 h, and the reaction temperature is 50 ℃, then triethanolamine and polyvinylpyrrolidone are added and react for 2 h at temperature of 50 ℃.

Key words: silver loaded montmorillonite, preparation, temperature, sustained release

中图分类号:

O614

徐光年, 乔学亮, 张文海, 金俊成, 常文贵. 反应温度对蒙脱石载银量及其缓释性能的影响[J]. 应用化学, 2015, 32(4): 453-457.

XU Guangniana, , QIAO Xueliangb, ZHANG Wenhaia, JIN Junchenga, CHANG Wenguia. Influence of Reaction Temperature on the Amount of Silver Loaded on Montmorillonite and Its Sustained Release Performance[J]. Chinese Journal of Applied Chemistry, 2015, 32(4): 453-457.

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