高锰酸钾缓释剂的制备及其性能研究

利用油相相分离法微胶囊技术,以硬脂酸为壳物质,制备高锰酸钾缓释剂,通过条件优化实验,确定最佳工艺条件为:壳核比值为3∶1、搅拌速度450 r/min以及超声时间为10 min。所制的高锰酸钾缓释剂包覆率为163.3%,在水中缓释行为符合Q=0.00518×t0.611(R2=0.9951)动力学方程,理论缓释期为229.4 d,具有较好的缓释效果。对高锰酸钾缓释剂进行红外光谱和环境电镜扫描分析,结果表明,成膜前后硬脂酸的结构发生改变,硬脂酸对高锰酸钾的微胶囊化不是简单的物理吸附,而是通过化学键合包覆在高锰酸钾表面。

Preparation and characteristics of controlled release potassium permanganate

In order to remediate the DNAPLs pollution in ground water,the preparation and characterization of the encapsulated KMnO_4 particles by stearic acid was studied.The purpose of encapsulated KMnO_4 particles by phase separation method was to create microcapsules with slow-release properties.The encapsulation rate can be up to 163.3%when the ratio of stearic acid and KMnO_4 was 3:1,stirring speed at 450 r/min and ultrasonic time was 10 min.The release kinetics of encapsulated KMnO_4 particles was in good agreement with Q=kt~nmodel and the theoretical time of the encapsulated KMnO_4 to release permanganate into water continually were 229.4 d under the above conditions of preparation.The characteristics of encapsulated KMnO_4 by IR and SEM analysis showed that the structure of stearic acid was decomposed during the encapsulation process,while stearic acid was bonded chemically into the surface of KMnO_4,rather than adsorbed physically.