Intra particle diffusion The mechanism of sorbate ndash

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Ionic liquids; Thermal stability; Decomposition mechanism; Amino acid; Quantum chemistry; Activation energy
1. Introduction
Since the 1980s, interest has enormously grown in the room-temperature ionic liquids (RTILs), which are ideal reaction solvents, extraction solvents, electrolyte materials, and so on. The advantages of using amino acids are their low cost, biodegradability, biological acceptable, nontoxic and pharmaceutically acceptable, novel RTILs have been developed by focusing on the amino acids [1], [2], [3], [4] and [5]. Amino PSI-6206 ionic liquids (AAILs) have the potential to be applied in a wide range of scientific and industrial areas [6] and [7]. Amino acid ionic liquids may also be biodegradable ionic liquids depending on the cation structure partner [8].
Decomposition temperature (Td) is another important property of the ionic liquids which make them different from the industrial applications views. Earlier, many amino acid ionic liquids, containing 1-alkyl-3-methylimidazolium(Cnmim), tetraalkylammonium(Nn n n n) and tetraalkylphosphonium(Pn n n n) cations, have been synthesized and their properties such as thermal decomposition have been reported. For a given anion, the Td of a series of amino acid ionic liquids is increased in the following order: [9], [10] and [11]Nnnnn<Cnmim<Pnnnn.