【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1 000μmol/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1 s、总氧化剂(total radical oxidant,TRO)的质量浓度从10 mg/L升至30 mg/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1 mg/L、2 mg/L、5 mg/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。更多还原

【Abstract】 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 H2O2dosing 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.更多还原