Abstract
The development of refrigerant adsorbent materials is not only essential for enhancing the efficiency of refrigeration systems but also plays a pivotal role in environmental conservation and addressing global warming challenges. However, traditional adsorbent materials are often limited in widespread applications in industrial scales due to various disadvantages, such as low adsorption efficiency, difficulties in desorption, and poor reusability. In this context, three distinct PILs, P[EVIM][PF6], P[BVIM][PF6] and P[HVIM][PF6], were synthesized and characterized. In addition, their structure as well as adsorption capacities towards three different Freon refrigerants (R12, R22 and R134a) were explored. The results indicated that the synthesized PILs had high thermal stability and exceptional adsorption capabilities, with P[EVIM][PF6] demonstrating the best adsorption performance. These PILs consistently maintain a stable saturated adsorption capacity throughout nine consecutive adsorption-desorption cycles, and the desorption rate of the adsorbent tubes consistently exceeded 96%. Thus, the superior recyclability of these PILs was verified. These PILs provide a promising route for efficient adsorption of Freon refrigerants, highlighting their potential significance in pertinent industries and environmental conservation efforts.
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