摘要
报道了环丙沙星与十二磷钼酸的多金属氧酸盐化合物,用元素分析、IR、TG-DTA等方法对其进行了表征,结果显示该化合物仍保持Keggin型结构特征。同时,采用TG-DTG技术研究了标题化合物在氮气气氛中的热分解机理及非等温动力学,它的热分解过程经历了3个阶段,其中间体和残余物运用TG-DTG、IR和XRD技术进行了确证。采用Achar方程、Coats-Redfern方程、Kissinger方程、Flynn-Wall-Ozawa方程和Starink方程对非等温动力学数据进行了分析,得到了第3步热分解反应的机理函数、动力学参数和热分解反应动力学方程,其热分解反应过程受F3(化学反应)机理控制,表观活化能为351kJ.mol-1,指前因子为2.57×1030s-1。
Polyoxometalate of ciprofloxacin with 12-phosphomolybdic acid was reported and characterized with elemental analysis, IR spectrum, and TG-DTA. The IR spectrum confirmed the presence of Keggintype anion and the characteristic functional group of ciprofloxacin. The TCJ-DTG curves showed that its thermal decomposition was a three-step process. The intermediates and residue of the thermal decomposition were identified by means of TG-DTG, IR, and XRD technique. The non-isothermal kinetic data were analyzed with the Achar equation, Coats-Redfern equation, Kissinger equation, Flynn-Wall- Ozawa equation and Starink equation. The mechanism function and kinetic parameters of the thermal decomposition in the third step were obtained. The chemical reaction mechanism （F3） controlled the third thermal decomposition process. The apparent activation energy and the pre-exponential factor were 351 kJ · mol^-1 and 2.57×10^30· s^-1 respectively.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2007年第3期646-651,共6页
CIESC Journal
基金
湖北省教育厅科研基金项目(J200522002)。~~
