介质阻挡放电等离子体分解丁酸的反应动力学和机制

Decomposition kinetics and mechanism of butyric acid under dielectric barrier discharge plasma

研究了介质阻挡放电等离子体分解丁酸的反应动力学和机制。等离子体作用下丁酸的分解遵循一级反应动力学规律,是一级反应,丁酸在空气、氧气和氮气等离子体作用下的分解速率常数分别为7.56×10^(-3)、8.54×10^(-3)和5.67×10^(-3)s^(-1)。丁酸在氮气等离子体作用下分解得最慢,在氧气等离子体作用下分解得最快,表明体系中的活性氧物种在等离子体分解丁酸的过程中起着更重要的作用。探讨并提出了等离子体作用下丁酸的可能分解机制,丁酸在·OH、H_2O_2等活性氧物种的存在下氧化分解为低级的一元酸和二元酸。本研究工作为低温等离子体对长链脂肪酸和脂质的作用研究提供了基础,将有助于理解低温等离子体对细胞、组织等的作用和机制。

Decomposition kinetics and mechanism of butyric acid under non-thermal dielectric barrier discharge(DBD)plasma were investigated.The decomposition of butyric acid under DBD plasma followed the first-order kinetic law.The decomposition rate constants of butyric acid under air-,O 2-and N 2-plasma treatment were calculated to be 7.56×10-3,8.54×10-3,and 5.67×10-3 s-1,respectively.The decomposition rate of butyric acid in N 2-plasma was the smallest,and the rate in O 2-plasma was the highest,indicating that the reactive oxygen species played a more significant role in the decomposition of butyric acid under plasma treatment.The possible decomposition mechanisms of butyric acid under plasma treatment were proposed,and in the presence of reactive oxygen species such as hydroxyl radicals(·OH)and hydrogen peroxide(H 2O 2),butyric acid was oxidized and decomposed to lower monoacids and dicarboxylic acids.Our work provided a basis for the study of the effect of non-thermal plasma on long chain fatty acids and lipids,and aided in understanding the overall effects and mechanisms of the plasma acting on biological species such as cells and tissues.