King Abdulaziz City for Science and Technology (KACST), Nuclear Science Research Institute, National Center for Irradiation Technology, Innovation and Industrialization Affairs, Saudi-Chinese Centre for Technology Transfer, P. O. BOX 6086, Riyadh, 11442, Saudi Arabia.
Institut de Chimie des Milieux et des Matériaux de Poitiers (IC2MP), Université de Poitiers, UMR CNRS 7285, Equipe Eaux, Biomarqueurs, Contaminants Organiques, Milieux, ENSIP, 1, Rue Marcel Doré, 86073, Poitiers Cedex 9, France.
Environ Sci Pollut Res Int. 2019 Mar;26(7):6939-6947. doi: 10.1007/s11356-018-04115-9. Epub 2019 Jan 14.
In this study, aqueous solutions of gallic acid (GA) were irradiated in an electron beam (EB) accelerator under different experimental conditions (various initial GA concentrations, presence or absence of oxidant and oxygen). For an initial GA concentration of 50 μM, complete GA degradation was achieved with an absorbed dose of 850 Gy in the presence of dissolved oxygen. Both GA removal and mineralization are favored when oxygen is present. The addition of persulfate anions (SO) or hydrogen peroxide (HO) also increased the efficiency of GA degradation and mineralization. For an absorbed dose of 14 kGy, GA mineralization reached approximately 45%, 55%, and 72% for the EB, EB/HO, and EB/SOsystems, respectively. Three transformation products were tentatively identified in the presence of oxygen, these are the result of hydroxylation and ring opening reactions. No specific transformation product was found for the sulfate radical anion (SO) reaction. Four additional compounds, including a dimer, were identified in oxygen-free solutions. These findings demonstrate that water radiolysis based on EB irradiation is an efficient process to activate HO and SO anions and is an advanced oxidation process (AOP).
在这项研究中，没食子酸（GA）的水溶液在电子束（EB）加速器中在不同的实验条件下（各种初始 GA 浓度、是否存在氧化剂和氧气）进行辐照。在存在溶解氧的情况下，初始 GA 浓度为 50μM 时，吸收剂量达到 850Gy 时可实现完全 GA 降解。当存在氧气时，GA 的去除和矿化都更有利。添加过硫酸盐阴离子（SO）或过氧化氢（HO）也会提高 GA 降解和矿化的效率。对于吸收剂量为 14kGy，GA 的矿化率分别达到 EB、EB/HO 和 EB/SO 系统的约 45%、55%和 72%。在存在氧气的情况下，有三个转化产物被暂定识别，这些是羟基化和开环反应的结果。对于硫酸根自由基阴离子（SO）反应，没有发现特定的转化产物。在无氧溶液中还鉴定了另外四种化合物，包括二聚体。这些发现表明，基于 EB 辐照的水辐射分解是一种有效激活 HO 和 SO 阴离子的过程，是一种高级氧化过程（AOP）。
