Removal Process of Water and Ammonia Molecules of Thermal Weight Loss Process of Tetraamminecopper(Ⅱ) Sulfate Monohydrate Based on TG-FTIR-MS Hyphenated Analysis
QI Ji, YANG You-Yuan-He, ZHANG Chun-Ting**
College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China
Abstract The preparation and composition determination of tetraamminecopper(Ⅱ) sulfate monohydrate(Cu(NH3)4SO4·H2O) is an important comprehensive chemical experiment. However, there were insufficient references and reports on its thermal weight loss in removing water and ammonia. It is difficult to judge the corresponding reaction of each weight-loss platform only by thermogravimetric and differential thermal curves due to the molar mass of NH3 and H2O were very close. Therefore, hyphenated technology of thermogravimetric-differential thermal analysis (TG-DTA) and thermogravimetric-Fourier transform infrared radiation-mass spectrometry (TG-FTIR-MS) were applied to analyze Cu(NH3)4SO4·H2O, which clarified the chemical changes of Cu(NH3)4SO4·H2O during the process of temperature rise, promoted the students' analysis capability on thermal analysis curve and enriched the content of Cu(NH3)4SO4·H2O experiment project. Meanwhile, a new substance that might exist but without available realistic report was proposed through interpreting the thermal analysis curve, which worth to study more.
QI Ji, YANG You-Yuan-He, ZHANG Chun-Ting. Removal Process of Water and Ammonia Molecules of Thermal Weight Loss Process of Tetraamminecopper(Ⅱ) Sulfate Monohydrate Based on TG-FTIR-MS Hyphenated Analysis[J]. Chinese Journal of Chemical Education, 2023, 44(16): 48-52.
