南京工业大学学报（自然科学版）2025，Vol.47Issue(5)：516-522,7.DOI:10.3969/j.issn.1671-7627.2025.05.005
水热合成钛酸钠过程的微量热研究
Microcalorimetric study on the hydrothermal synthesis of sodium titanate
摘要
Abstract
Hydrothermal synthesis of sodium titanate is one of the key steps in preparing titanate nanotubes.However,due to the high temperature and high pressure conditions of the hydrothermal process,it is difficult to obtain real-time reaction kinetics information,making it challenging to effectively elucidate the reaction mechanism and kinetic behavior.A custom micro-hydrothermal reactor was used,and the heat flow changes during the hydrothermal reaction between TiO2 and NaOH,resulting in the formation of sodium titanate nanomaterials,were monitored in situ using microcalorimetry.Effects of TiO2 crystal phase,NaOH concentration,and heating rate on the reaction heat flow were investigated,and the kinetic parameters were fitted using the ASTM E698 method.The heat flow curve of the hydrothermal reaction exhibited three stages,corresponding to the dissolution of TiO2,the formation of layered Na2Ti2O5·H2O,and the densification of Na2Ti2O5·H2O.The enthalpy change for the dissolution of anatase TiO2 was(8.329±0.453)kJ/mol;the minimum formation temperature of layered Na2Ti2O5·H2O was 59.1 ℃(extrapolation method),and its standard Gibbs free energy of formation was-2 545.4 kJ/mol.The activation energy of the reaction was 90.17 kJ/mol.The thermodynamic kinetic results obtained in this work for the hydrothermal synthesis of sodium titanate provide a new perspective for further research into the hydrothermal process.关键词
TiO2/Na2Ti2O5·H2O/纳米线/水热合成/微量热/热分析动力学Key words
TiO2/Na2Ti2O5·H2O/nanowire/hydrothermal synthesis/microcalorimetry/thermal analysis kinetics分类
化学化工引用本文复制引用
吕安雯,项雯静,刘畅..水热合成钛酸钠过程的微量热研究[J].南京工业大学学报（自然科学版）,2025,47(5):516-522,7.基金项目
国家自然科学基金(21878143) （21878143）
