Sheng Su, Jin Shengming, Cui Kuixin
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
Key Laboratory for Mineral Materials and Application of Hunan Province, Central South University, Changsha 410083, China.
Materials (Basel). 2020 Sep 25;13(19):4287. doi: 10.3390/ma13194287.
Nanostructured (BiO)CO samples were prepared, and their thermal decomposition behaviors were investigated by thermogravimetric analysis under atmospheric conditions. The method of preparation and Ca doping could affect the morphologies of products and quantity of defects, resulting in different thermal decomposition mechanisms. The (BiO)CO nanoplates decomposed at 300-500 °C with an activation energy of 160-170 kJ/mol. Two temperature zones existed in the thermal decomposition of (BiO)CO and Ca-(BiO)CO nanowires. The first one was caused by the decomposition of (BiO)(OH)CO impurities and (BiO)CO with surface defects, with an activation energy of 118-223 kJ/mol, whereas the second one was attributed to the decomposition of (BiO)CO in the core of nanowires, with an activation energy of 230-270 kJ/mol for the core of (BiO)CO nanowires and 210-223 kJ/mol for the core of Ca-(BiO)CO nanowires. Introducing Ca ions into (BiO)CO nanowires improved their thermal stability and accelerated the decomposition of (BiO)CO in the decomposition zone.
制备了纳米结构的(BiO)CO样品，并在大气条件下通过热重分析研究了它们的热分解行为。制备方法和Ca掺杂会影响产物的形貌和缺陷数量，从而导致不同的热分解机制。(BiO)CO纳米片在300 - 500℃分解，活化能为160 - 170 kJ/mol。(BiO)CO和Ca-(BiO)CO纳米线的热分解存在两个温度区。第一个温度区是由(BiO)(OH)CO杂质和具有表面缺陷的(BiO)CO的分解引起的，活化能为118 - 223 kJ/mol，而第二个温度区则归因于纳米线核心中(BiO)CO的分解，(BiO)CO纳米线核心的活化能为230 - 270 kJ/mol，Ca-(BiO)CO纳米线核心的活化能为210 - 223 kJ/mol。将Ca离子引入(BiO)CO纳米线提高了它们的热稳定性，并加速了分解区中(BiO)CO的分解。
