Acidity enhancement of sulfonic acid derivatives by hydrogen bond networks

Acid-Modified, Ti3C2-Based MXene as Catalysts for Upcycling Polyethylene Terephthalate

“…The material with the largest concentration of sulfonic acid groups on its surface, Ti 3 C 2 T x -SO 3 H-5, was characterized by two relatively large peaks at 90 and 372 °C (Figure ), which are weaker in the other materials. It is thus reasonable to conclude that the strength of acidity increases as the SO 3 –H content increases, most probably due to hydrogen bond formation between these functional groups . In other words, as Table proves, the sample with the highest concentration of sulfonic groups possesses the strongest types of acid sites and the highest amount of acid groups.…”

“…It is thus reasonable to conclude that the strength of acidity increases as the SO 3 −H content increases, most probably due to hydrogen bond formation between these functional groups. 48 In other words, as Table 1 proves, the sample with the highest concentration of sulfonic groups possesses the strongest types of acid sites and the highest amount of acid groups. It is worth noting that the strength of sulfonic acid varies depending on factors such as the quantity of sulfonic acids loaded onto the surface and changes in the surrounding environment.…”