中文摘要：

为了研究大气压强电场放电产生的羟基自由基（·OH）对水中难降解的酚类有机物-对羟基苯甲酸（4-HBA）的氧化降解，同时研究羟基自由基对4-HBA去除率和投加过氧化氢（H2O2）的质量浓度及投加方式的影响，以浓度为1000panol／L的4-HBA水溶液作为研究水体，通过大气压强电场放电协同气液混溶装置对该溶液进行处理，并通过高效液相色谱来测定4-HBA的浓度。实验结果表明：在处理时间为1s、总氧化剂（total radical oxidant，TRO）的质量浓度从10mg／L升至30mg／L的条件下，水体中4-HBA的浓度从525．72μmol／L降至180．89μmol／L；在投加H2O2的质量浓度为1mg／L、2mg／L、5mg／L的条件下，水体中4-HBA的去除率从50．13％升高到64．15％，反应前投加H2O2时的4-HBA去除率比反应后投加H2O2时的4-HBA去除率高。因此，增加水中的TRO有助于4-HBA的降解，反应前投加一定量的H2O2有助于4-HBA的氧化降解。

英文摘要：

To study the degradation of p-hydroxybenzoic acid （4-HBA） by hydroxyl radicals （＊OH）, we treated 4-HBA solution of 1 000 μmol/L using atmospheric strong-field ionization discharge assisted with a gas-liquid interfusion device. In the experiments, we measured the concentration of 4-HBA and its degradation byproducts using Dionex HPLC system, analyzed the degradation rate of 4-HBA, and investigated the influences of concentration and inputting method of H2O2 dosing on the degradation. Given the treatment time of 1 s, when the concentration of total radical oxidant （TRO） increases from 10 mg/L to 30 mg/L, the concentration of 4-HBA descends from 525.72 μmol/L to 180.89 μmol/L. When the concentration of H2O2 dosing increases from 0 mg/L to 5mg/L, the removal rate of 4-HBA solution increases from 50.13% to 64.15%. It is concluded that dosing H2O2 before treatment and increasing TRO in the undertreating solution are both advantageous for degradating solved 4-HBA.