Thermal behavior of solid acids in the Rb3H(SO4)2-RbHSO4 system under ambient atmosphere

Abstract

The thermal behavior of solid acids in the Rb3H(SO4)2-RbHSO4 system under ambient atmosphere has been studied in comparison to the previously reported high-temperature behavior of the same system under humidified atmosphere. The findings showed that, under this level of humidity, the transition of RbHSO4, the transition of Rb5H3(SO4)4, and the disproportionation of Rb3H(SO4)2, occurred at the same temperatures as those under humidified atmosphere. However, the results from differential scanning calorimetry did not reveal the reaction temperature between Rb3H(SO4)2 and RbHSO4 due to the slow process. The dehydration temperatures of Rb5H3(SO4)4 were surprisingly similar between the systems under low and high humidity levels, while the dehydration of RbHSO4 under low humidity occurred at a lower temperature than that previously reported. Additionally, the findings suggested that the humidity levels played some roles in the kinetics of the reaction between Rb3H(SO4)2 and RbHSO4 which should be further studied.

Novel controllable (Ba0.8Sr0.2)CO3@Mesoporous silicate core/shell nanocomposite grafted fluorescent probes for colorimetric, sensing, and selective detection of heavy metals

“…The findings indicate that the nanosensors under investigation exhibit exceptional sensitivity, selectivity, and superior detection capabilities across all the metal ions considered. Furthermore, our study revealed that these nanosensors exhibit notably low detection limits and superior efficiency in comparison to previously reported findings by other researchers 33–40 . Table 4 provides a comparative analysis of distinct characteristics of the present sensing system with other optical sensors and spot test methods.…”

“…Furthermore, our study revealed that these nanosensors exhibit notably low detection limits and superior efficiency in comparison to previously reported findings by other researchers. [33][34][35][36][37][38][39][40] Table 4 provides a comparative analysis of distinct characteristics of the present sensing system with other optical sensors and spot test methods. The results presented in the table shows that the sensitivity of the present optical sensor for the detection of the metal ions was very high compared to other methods.…”