Yan Yujie, Jin Bo, Zhou Qian, Zhang Jinhao, Peng Rufang
State Key Laboratory of Environment-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China.
Langmuir. 2022 Jul 19;38(28):8623-8632. doi: 10.1021/acs.langmuir.2c00994. Epub 2022 Jul 10.
Chitosan-lead (CS-Pb) carbon aerogels were prepared by ionic cross-linking and high-temperature carbonization using chitosan (CS) as the carbon precursor. The obtained carbon aerogels were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), and X-ray photoelectron spectroscopy (XPS). The obtained aerogels have a 3D structure and a large surface area, which can effectively prevent the agglomeration phenomenon of metals. Differential thermal analysis (DTA) was used to analyze the catalytic performance of a carbon aerogel for ammonium perchlorate (AP). The results showed that the CS-Pb carbon aerogel reduced the peak temperature of AP pyrolysis from 703.9 to 627.7 K. According to the Kissinger method calculations, the of AP decomposition decreased about 27.2 kJ/mol. The TG data at different warming rates were analyzed by the Flynne-Walle-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods, which are two of the isoconversion methods, and the activation energies of AP and AP+CS-Pb-3.5 were calculated. Between the conversion degrees (α) of 0.1 and 0.9, the values obtained by the two isoconversion methods are similar and have a certain match. Also, the two isoconversion methods confirm Kissinger's calculation. Finally, thermogravimetry-mass spectrometry (TG-MS) was used to monitor the gases generated during the thermal decomposition of the AP+CS-Pb-3.5 system in real time.
以壳聚糖（CS）为碳前驱体，通过离子交联和高温碳化制备了壳聚糖-铅（CS-Pb）碳气凝胶。采用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、X射线衍射仪（XRD）和X射线光电子能谱（XPS）对所得碳气凝胶进行了表征。所得气凝胶具有三维结构和较大的比表面积，能够有效防止金属的团聚现象。采用差示热分析（DTA）研究了碳气凝胶对高氯酸铵（AP）的催化性能。结果表明，CS-Pb碳气凝胶使AP热解的峰值温度从703.9 K降至627.7 K。根据基辛格方法计算，AP分解的表观活化能降低了约27.2 kJ/mol。采用等转化率方法中的Flynne-Walle-Ozawa（FWO）法和Kissinger-Akahira-Sunose（KAS）法对不同升温速率下的TG数据进行分析，计算了AP和AP+CS-Pb-3.5的活化能。在转化率（α）为0.1至0.9之间，两种等转化率方法得到的值相似且具有一定的匹配度。此外，两种等转化率方法证实了基辛格的计算结果。最后，采用热重-质谱联用（TG-MS）实时监测AP+CS-Pb-3.5体系热分解过程中产生的气体。
