FePO4·4H2O的脱水动力学研究  

Kinetics of Dehydration of FePO_4·4H_2O in Air

作　　者：张梅芳[1] 洪建和[2] 袁良杰[1] 张友祥[1] 张克立[1] 

机构地区：[1]武汉大学化学与分子科学学院,武汉430072 [2]中国地质大学教育部纳米矿物材料及应用工程研究中心,武汉430074

出　　处：《无机化学学报》2009年第6期1022-1025,共4页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目(No.20071026)

摘　　要：用热分析(TG-DTG-DTA)、X射线衍射(XRD)技术研究了固态物质FePO4·4H2O在空气中脱水过程。热分析结果表明,FePO4·4H2O在空气中脱水的质量变化率与理论计算相吻合。XRD结果表明,FePO4·4H2O脱水产物为FePO4。由等转换率法得到脱水过程的活化能,依此为初始值,用多元非线性回归得到了失水反应拟合的最可几模型为两步连串反应:D4→Fn,活化能分别为79.62和103.04kJ·mol-1,lgA值分别为8.40和11.02。The dehydration processes of the solid state FePO4·4H2O in Air have been studied by using TG-DTG- DTA and XRD techniques. TG-DTG-DTA curves showed that the dehydration proceeds through two well-defined steps, the mass loss of the which is in good agreement with the theoretical values. The XRD profile verified that the product of the dehydration process was FePO4. The activation energies of the dehydration, calculated by the Friedman and the Flynn-Wall-Ozawa （FWO） methods, acted as the initial values for the multiple-nonlinear regression method, from which the most-probable conversion functions and the corresponding kinetic parameters have been estimated.

关 键 词：FePO4·4H2O TG—DTG—DTA XRD 脱水 动力学 

分 类 号：O643.12[理学—物理化学]