Dehydration Kinetics of Zinc Phosphate Tetrahydrate α-Zn3(PO4)2·4H2O Nanoparticle

• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2007,（6）
• 页码范围: 857-862
• 页数: 6页
• 语种: 英文

摘要

TG-DTG technique and Harcourt-Esson integrated equation were used to study the dehydration process of zinc phosphate tetrahydrate α-Zn3(PO4)2·4H2O nanoparticle and its thermal decomposition kinetics. The results show that there are three stages of dehydration between 300 and 800 K during the thermal decomposition of α-Zn3(PO4)2·4H2O nanoparticle. The first stage is controlled by chemical reaction with an activation energy of 69.48 Kj·mol-1 and a pre-exponential factor of 1.77×106s-1. The second is controlled by nucleation and growth with an activation energy of 78.74 Kj·mol-1 and a pre-exponential factor of 5.86×109s-1. The third is controlled by nucleation and growth with an activation energy of 141.5 kJnnor1 and a pre-exponential factor of 1.01 × 1012 s-1. The kinetic compensative effects not only exist in Arrhenius equation but also in Harcourt-Esson equation. Activation energy E is dependent on both the decomposition fraction a and temperature T.