热分解
分解
傅里叶变换红外光谱
红外光谱学
活化能
扫描电子显微镜
材料科学
物理化学
动力学
脱水反应
分析化学(期刊)
粉末衍射
热分析
脱水
化学
结晶学
热的
化学工程
热力学
有机化学
物理
复合材料
量子力学
生物化学
工程类
作者
Banjong Boonchom,Chanaiporn Danvirutai
摘要
The thermal decomposition of iron phosphate trihydrate FePO4·3H2O was investigated in air using TG-DTG/DTA. The FePO4·3H2O decomposes in two steps, and the final decomposition product (FePO4) was studied by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FT-IR) spectroscopy. The activation energies of the second dehydration reaction of FePO4·3H2O were calculated through the isoconversional methods of Ozawa and Kissinger−Akahira−Sunose (KAS), and the possible conversion functions have been estimated through the Coats−Redfern method. The specificity of thermal decomposition was characterized by identification of the bonds to be selectively activated due to energy absorption at the vibrational level, which was assigned by comparing the calculated wavenumbers with the observed wavenumbers in FTIR spectra. The kinetic model that better describes the second reaction of dehydration for FePO4·3H2O is the Fn model as a simple n-order reaction, and the corresponding function is ×c4(α) = (1−α)2.50 and g(α) = −[1−(1−α)-1.50/(1.50)].
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