反应温度对蒙脱石载银量及其缓释性能的影响  

Influence of Reaction Temperature on the Amount of Silver Loaded on Montmorillonite and Its Sustained Release Performance

作　　者：徐光年[1] 乔学亮[2] 张文海[1] 金俊成[1] 常文贵[1] 

机构地区：[1]皖西学院,纳米功能复合材料的制备与应用技术推广中心,安徽六安237012 [2]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《应用化学》2015年第4期453-457,共5页Chinese Journal of Applied Chemistry

基　　金：安徽省自然科学基金(1308085ME57);华中科技大学材料成形与模具技术国家重点实验室开放基金(P2014-17);国家自然科学基金(21271141)资助项目~~

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。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 ℃.

关 键 词：载银蒙脱石 制备 温度 缓释性能 

分 类 号：O614[理学—无机化学]